JP2014163102A - Vibration suppression device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration suppression device capable of properly suppressing vibration of a structure, downsizing the whole device, and reducing manufacturing costs.SOLUTION: In a vibration suppression device, a first bearing member 2 has one end connected to a predetermined first portion R1 located in a first beam BD, which is one of a pair of beams, and located between a junction of one PL of a pair of columns and the first beam BD and a center between the pair of columns PL, PR. The first bearing member 2 extends obliquely from the first portion R1 toward a second beam BU which is the other of the pair of beams. A second bearing member 3 has one end connected to a predetermined second portion R2 located in a first beam BD and located between a junction of the other PR of the pair of columns and the first beam BD and a center between the pair of columns. The second bearing member 3 extends obliquely from the second portion R2 toward the second beam BU. The other end part of the second bearing member 3 is connected to the other end part of the first bearing member 2. Mass dampers 4, 5 have rotation masses 23, 33 respectively. One end parts of the mass dampers are connected to the second beam, and the other end parts thereof are connected to the other end parts of the first and second bearing members 2, 3, respectively.

Description

  The present invention relates to a vibration suppressing device for suppressing vibration of a structure having a cross-beam-shaped frame structure in which a pair of pillars extending in parallel and vertically and a pair of upper and lower beams extending in parallel to each other are joined to each other. .

  Conventionally, what was disclosed by patent document 1 as this kind of vibration suppression apparatus is known, for example. The vibration suppressing device is provided in a structure having a cross-beam-like frame structure in which a pair of left and right columns and a pair of upper and lower beams are joined to each other, and includes a first support member and a second support member that are formed of column members. And a mass damper having a rotating mass and an oil damper. The first and second support members constitute an inverted V-shaped brace. Specifically, one end of the first support member is fixed to a joint between the left column and the lower beam (hereinafter referred to as “first joint”), and extends obliquely upward toward the right. The second support member has one end fixed to the joint between the right column and the lower beam (hereinafter referred to as “second joint”), and extends obliquely upward toward the left. The other end portions of the first and second support members are connected to each other via a connecting member.

  The mass damper and the oil damper are provided symmetrically with respect to the connecting member. Specifically, one end of the mass damper is attached to the connecting member, and the other end is attached to the left end of the upper beam via a fixture. Also, one end of the oil damper is attached to the connecting member, and the other end is attached to the right end of the upper beam via a fixture. Thus, the mass damper, the first and second support members are provided in series with the pair of beams. In the conventional vibration suppression device having the above-described configuration, relative displacement between the pair of upper and lower beams is transmitted to the mass damper and the oil damper via the first and second support members as the structure vibrates. Thereby, the inertial mass effect of the mass damper and the damping effect of the oil damper are obtained, so that the vibration of the structure is suppressed.

JP 2012-122228 A (FIG. 2 etc.)

  FIGS. 9A and 9B show a pair of columns, a pair of beams, and a conventional vibration suppression device modeled for normal time and vibration time other than the vibration of the structure (oil damper). Is omitted). As described above, in the conventional vibration suppression device, the first and second joint portions to which the first and second support members are fixed are portions where the columns and the beams are joined, and thus the rigidity thereof is relatively high. For this reason, as shown in FIG. 9B (ordinary time is indicated by a two-dot chain line), the displacement transmitted to the mass damper via the first and second support members during the vibration of the structure is Since the relative displacement δ is substantially the same and relatively small, the vibration absorption effect of the structure by the additional vibration system composed of the mass damper and the first and second support members cannot be sufficiently obtained. It will not be possible to properly suppress the vibration.

  In addition, in order to appropriately suppress the vibration of a structure using an additional vibration system in which a mass damper having a rotating mass and a support member are connected in series, the natural frequency of the additional vibration system is synchronized with the natural frequency of the structure. Thus, it is preferable to set the mass of the rotating mass and the rigidity (spring constant) of the support member. In the conventional vibration suppression device, since the first and second support members are respectively fixed to the first and second rigid joints described above, when the structure vibrates, the first and second support members are It becomes difficult to deform (displace) against the reaction force of the mass damper, and the substantial rigidity of the first and second support members increases.

  In this case, the natural frequency of the additional vibration system including these first and second support members is “sqrt (k / m) / 2π” (where k is the rigidity (spring) of the first and second additional vibration systems. Constant), m is represented by the equivalent mass of the rotating mass). From the above, in the conventional vibration suppression device, the first and second support members are high in order to synchronize the natural frequency of the additional vibration system with the natural frequency of the structure in order to appropriately suppress the vibration of the structure. In order to meet the rigidity, a large mass damper having a relatively large mass of the rotating mass has to be used, which leads to an increase in the size and cost of the entire apparatus.

  The present invention has been made in order to solve the above-described problems, and provides a vibration suppressing device that can appropriately suppress vibration of a structure and can reduce the size of the entire device and reduce manufacturing costs. The purpose is to provide.

  In order to achieve the above object, the invention according to claim 1 has a cross-beam-like frame structure in which a pair of pillars extending vertically in parallel with each other and a pair of upper and lower beams extending horizontally in parallel with each other are joined together. A vibration suppressing device for suppressing vibration of a structure, which is composed of a pillar material, one end of which is one of a pair of beams, a first beam that is one of a pair of beams, A first support member connected to a predetermined first part between the center between the pillars and extending obliquely from the first part toward the second beam which is the other of the pair of beams, and a pillar material; One end of the first beam is connected to a predetermined second part between the joint of the first beam with the other of the pair of pillars and the center between the pair of pillars, and is inclined from the second part toward the second beam. And the other end of the second support member connected to the other end of the first support member, A rotating mass having one end and one end connected to the second beam and the other end connected to the other ends of the first and second support members. And a mass damper that converts relative displacement between the pair of beams transmitted through the two support members into a rotational motion of the rotary mass.

  According to this configuration, the first support member made of the column material has one end portion of the first beam, which is one of the pair of beams, in the center between the joint portion with one of the pair of columns and the pair of columns. And is obliquely extended from the first part toward the second beam which is the other of the pair of beams. In addition, the second support member made of a pillar material has one end connected to a predetermined second portion between the joint of the first beam with the other of the pair of columns and the center between the pair of columns. The other end portion is obliquely extended from the second portion toward the second beam, and the other end portion is connected to the other end portion of the first support member. Furthermore, one end of a mass damper having a rotating mass is connected to the second beam, and the other end is connected to the other ends of the first and second support members.

  In the vibration suppressing device having the above configuration, when a relative displacement occurs between the pair of beams as the structure vibrates, the relative displacement is transmitted to the mass damper via the first and second support members, Thereby, the rotating mass of the mass damper rotates, and the additional vibration system including the mass damper and the first and second support members vibrates. Therefore, by tuning (resonating) the natural frequency of the additional vibration system to the natural frequency of the structure, the vibration energy of the structure is absorbed by the additional vibration system, and hence the vibration of the structure is suppressed.

  FIGS. 10A and 10B show a pair of columns, a pair of beams, and vibrations when one end portions of the first and second support members are connected to the first and second portions of the lower beam, respectively. An example of the suppression device is shown as a model for each of a normal time and a vibration time other than the vibration time of the structure. Since the pair of columns and the pair of beams constitutes a ramen structure, when the structure vibrates, as shown in FIG. 10B (ordinary time is indicated by a two-dot chain line), the pair of columns is the length of the beam. When bending and deforming to one side in the vertical direction, the pair of beams are bent and deformed substantially in a sine wave shape, and the portion on one side in the length direction of each of the pair of beams is convex upward, The other side portion is bent and deformed downward. Although not shown in the figure, conversely, when the pair of columns is bent and deformed to the other side in the length direction of the beam, the pair of beams is also bent and deformed in a sine wave shape in this case. The portion of the other side in the length direction is bent upward, and the portion on one side is bent downward so as to be bent.

  According to the present invention, as is apparent from the above-described configuration and as shown in FIG. 10, the first and second support members are provided in a substantially inverted V shape, and the first and second support members are provided. Unlike the conventional case described above, the members are connected to the first and second portions of the first beam between the two joints with the pair of columns, respectively. As shown in FIG. 10 (b), the other ends of the first and second support members connected to each other are displaced in a direction opposite to the direction of the displacement Δ of the upper beam to which the mass damper is connected with respect to the lower beam. To do. As a result, when the structure vibrates, the mass damper is transmitted with a larger displacement obtained by adding the relative displacement Δ between the pair of beams and the displacement of the first and second support members. The effect of absorbing vibrations of the structure by the additional vibration system composed of the two support members can be sufficiently obtained, and hence vibrations of the structure can be appropriately suppressed.

  Further, unlike the above-described conventional case, the first and second support members are not the joint portion between the column and the beam, but the first and second portions between the two joint portions between the pair of columns in the first beam. Therefore, when the structure vibrates, the first and second support members are easily deformed (displaced) against the reaction force of the mass damper when the structure vibrates. (2) The substantial rigidity of the support member is lowered. For this reason, it is possible to use a small mass damper having a relatively small mass of the rotating mass, thereby reducing the size of the entire apparatus and reducing the manufacturing cost.

  Up to now, the operation and effect of the vibration suppressing device when one end of the first and second support members is connected to the first and second portions of the lower beam and the mass damper is connected to the upper beam, respectively. However, the first and second support members are connected to the first and second portions of the upper beam, and the mass damper is connected to the lower beam. Even in this case, these actions and effects can be obtained similarly. Further, FIG. 10 is merely an example, and it is a matter of course that the vibration suppressing device can adopt various configurations that can be conceived by those skilled in the art within the scope of the matters described in the claims. For example, the position and the number of the mass dampers are arbitrary, and the first and second support members do not necessarily have to be provided symmetrically with respect to the other end portions of the two connected to each other.

  In the present specification and claims, “joining” refers to connecting a plurality of members to each other by bolts or welding.

  According to a second aspect of the present invention, in the vibration suppressing device according to the first aspect, the first portion is approximately ¼ of the length between the pair of columns from one column toward the other column. The second portion is set at a position substantially ¼ of the length between the pair of columns from the other column toward the one column side.

  As described with reference to FIG. 10 in the description of the invention according to claim 1, when the structure is vibrated, when the pair of columns are bent and deformed to one side or the other side in the length direction of the beam, The beam bends and deforms in a sine wave shape. In this case, assuming that the length between the axes of the pair of columns is L, the portion of the pair of beams at a position approximately L / 4 from the axis of each of the pair of columns is The largest bending deformation is made upward or downward.

  According to this configuration, the first portion, that is, the connecting portion of the first beam to the first support member has a length (L) between the pair of columns from one column toward the other column side. The position is set to 1/4. Further, the second portion, that is, the connecting portion of the first beam to the second support member is approximately ¼ of the length (L) between the pair of columns from the other column toward the one column side. Set to position. As described above, when the structure vibrates, the displacement of the other end portions of the first and second support members using the bending deformation of the first beam can be maximized, so that the displacement transmitted to the mass damper is further increased. As a result, the vibration of the structure can be more appropriately suppressed.

  According to a third aspect of the present invention, in the vibration suppressing device according to the first or second aspect, between the first beam and the second beam, the pair of columns extends horizontally in parallel with the first and second beams. A third beam joined to the first is provided.

  When the structure vibrates, the relative displacement between the pair of upper and lower beams basically becomes larger as they are separated in the vertical direction. According to the above-described configuration, the third beam is provided between the first beam and the second beam, and accordingly, the first beam and the second beam are far apart in the vertical direction, so that they are transmitted to the mass damper. Displacement can be increased, and as a result, vibration of the structure can be suppressed more appropriately.

  According to a fourth aspect of the present invention, in the vibration suppressing device according to the third aspect, the third beam has a pair of beam members that are coupled to each other and are opposed to each other in the horizontal direction, and the first and second support members Is characterized by penetrating vertically between a pair of beam members.

  According to this configuration, the pair of beam members of the third beam are connected to each other and face in the horizontal direction, and the first and second support members pass through between the pair of beam members. As a result, when the structure vibrates, the first and second support members can be displaced without hindrance with respect to the third beam. Therefore, the displacement can be appropriately transmitted to the mass damper via both support members, and thus The effect according to claim 3 can be obtained appropriately.

  In addition, since the mass damper suppresses the vibration of the structure by using the rotational inertia effect of the rotating mass, a reaction force or a reaction torque of the mass damper is generated with the rotation of the rotating mass, and the first and second support members As a result, the first and second support members may buckle in the weak axis direction or be largely twisted. As described above, since the first and second support members penetrate between the pair of beams facing each other in the horizontal direction, the first and second support members are weakened by this reaction force and reaction force torque. Axial buckling and twisting can be prevented by the pair of beam members. Therefore, the displacement of the structure transmitted to the mass damper via the first and second support members can be favorably converted into the rotational motion of the rotary mass without being affected by the reaction force or reaction torque of the mass damper. Thus, the vibration of the structure can be appropriately suppressed. Moreover, the effect of preventing the buckling and twisting in the weak axis direction of the first and second support members described above can be obtained using the existing third beam.

  The invention according to claim 5 is the vibration suppressing device according to claim 4, wherein at least one of the first supporting member and the pair of beam members facing each other and the second supporting member and the pair of beam members facing each other. A surface material having slipperiness is affixed to at least one of the surfaces.

  According to this configuration, at least one of the mutually opposing surfaces of the first support member and the pair of beam members and at least one of the mutually opposing surfaces of the second support member and the pair of beam members have a sliding surface material. Is attached, so that when the structure vibrates, even if the first and second support members abut against the beam material, both the support members can be smoothly displaced, thereby displacing the mass damper. Can be communicated appropriately.

  According to a sixth aspect of the present invention, in the vibration suppressing device according to any one of the first to fifth aspects, the one end portions of the first and second support members abut each other without being fixed to the first and second portions. And is composed of a steel wire, pretensioned, one end connected to the first support member, the other end connected to the first beam, and a steel wire, And a second cable having one end connected to the second support member and the other end connected to the first beam while being pretensioned.

  According to this configuration, one end portion of the first support member is in contact with the first portion of the first beam without being fixed, and one end portion and the other end portion of the first cable to which the pretension is applied are The first support member and the first beam are connected to each other. With this first cable, one end of the first support member is held in contact with the first part, that is, one end of the first support member is connected to the first part via the first cable. It is connected to. Similarly, one end portion of the second support member is in contact with the second portion of the first beam without being fixed, and one end portion and the other end portion of the second cable to which pre-tension is applied are supported by the second support member. The member and the first beam are connected to each other. With this second cable, one end of the second support member is held in contact with the second part, that is, one end of the second support member is connected to the second part via the second cable. It is connected to.

  With the above configuration, the rigidity (spring constant) of the first and second support members and the first and second cables has a bilinear characteristic with respect to the reaction force of the mass damper. Hereinafter, this point will be described.

  FIG. 11 shows the reaction force P of the mass damper when one end of the first and second support members is connected to the lower beam and both support members are arranged symmetrically with respect to the other end of each other. FIG. 5 shows an example of a relationship with the displacement (displacement input to the mass damper) x of the other end portions of the first and second support members to which the mass damper is connected. As shown in FIG. 11, in this example, the axial force N acting by the reaction force P of the mass damper is applied to the first support member in the direction opposite to the pretension of the first cable and to the second support member. Acts in the same direction as the pretension of the second cable. Further, (a) in the figure shows the case where the axial force N is smaller than the pretension of the first cable, and (b) shows the case where the axial force N is greater than the pretension of the first cable. ing.

First, the following equation (1) is established between the reaction force P of the mass damper and the axial force N from the balance condition. Here, θ is an angle formed by each of the first and second support members with the first beam.
N = P / 2 cos θ (1)

Further, when the lengths of the first and second support members are Lp, the Young's modulus of the first and second support members is Ep, and the cross-sectional areas of the first and second support members are Ap, respectively, the axial force N Is equal to or less than the pretension of the first cable (FIG. 11A), the displacement x is expressed by the following equation (2) from the above equation (1) and the virtual work method. As the displacement x occurs, the angle θ between the first support member and the first beam and the angle θ between the second support member and the first beam are strictly different from each other. Is very small, it is considered that they are the same in this equation (2).
x = {(P / 2 cos θ) (1/2 cos θ) Lp · 2} / (Ep · Ap)
= P · Lp / (2cos ² θ · Ep · Ap) (2)

From this equation (2), when the axial force N is smaller than the pretension of the first cable (FIG. 11A), the overall spring constant k1 of the first and second support members is expressed by the following equation (3 ).
k1 = P / x = 1 / {Lp / ( ² cos ² θ · Ep · Ap)} (3)

When the axial force N is equal to or greater than the pretension of the first cable (FIG. 11 (b)), the first support member is thereby separated from the first beam. From the work method, it is expressed by the following formula (4). Similar to the above formula (2), with the occurrence of the displacement x, the angle θ formed by the first support member with the first beam and the angle θ formed by the second support member with the first beam are strictly different from each other. However, since the difference between the two is very small, it is considered that they are the same in this equation (4).
x = {P · Lp / (2cos ² θ · Ep · Ap)}
+ {P · Lc / (4cos ² θ · Ec · Ac)} (4)
Here, Lc is the length of the first cable, Ec is the Young's modulus of the first cable, and Ac is the cross-sectional area of the first cable.

From this equation (4), when the axial force N is greater than or equal to the pretension of the first cable (FIG. 11 (b)), the overall spring constant k2 of the first cable and the first and second support members is It is represented by the following formula (5).
k2 = P / x = 1 / {[Lp / (2cos ² θ · Ep · Ap)]
+ [Lc / (4cos ² θ · Ec · Ac)]} (5)

  As is clear from a comparison between these equations (3) and (5), the overall spring constants of the first cable, the first and second support members when the axial force N is equal to or greater than the pretension of the first cable. k2 is smaller than the overall spring constant k1 of the first and second support members when the axial force N is smaller than the pretension of the first cable. This is because the axial force N is applied to the second support member in the same direction as the pretension of the first cable with respect to the first support member by the reaction force P of the mass damper acting in the opposite direction to the case of FIG. The same applies to the case of acting in the opposite direction to the pretension of the second cable. That is, when the axial force N is equal to or greater than the pretension of the second cable, the overall spring constant k4 of the second cable and the first and second support members is when the axial force N is smaller than the pretension of the second cable. It becomes smaller than the whole spring constant k3 of the first and second support members.

  From the above, as the relationship between the displacement x and the reaction force P of the mass damper, a bilinear relationship as shown in FIG. 12 can be obtained, and the rigidity of the first and second support members and the rigidity of the first and second cables are as follows. It has a bilinear characteristic with respect to the reaction force P of the mass damper. Accordingly, for example, when the natural frequency of the additional vibration system including the mass damper and the first and second support members is synchronized with the natural frequency of the structure to suppress the vibration of the structure, the displacement x increases. Accordingly, it is possible to obtain a smaller rigidity (= k2 or k4) before the reaction force P of the mass damper becomes excessive in synchronism with the vibration of the structure, and thereby the natural frequency of the additional vibration system. Can be made different from the natural frequency of the structure, the reaction force P of the mass damper can be suppressed. Therefore, it is possible to prevent excessive stress from being generated in the structure, the mass damper, and the first and second support members.

  According to a seventh aspect of the present invention, in the vibration suppressing device according to the sixth aspect, the first pin is attached to at least one of the first support member and the first beam, and at least the second support member and the first beam. On one side, a second pin is attached, and the first and second cables are wound around the first and second pins, respectively.

  According to this configuration, the first cable is wound around the first pin provided on at least one of the first support member and the first beam in the middle, and the second cable is wound in the middle. 2 It is wound around the 2nd pin provided in at least one of the supporting member and the 1st beam. As a result, by increasing the lengths of the first and second cables, the first cable and the first cable in the case where the axial force N is equal to or greater than the pretension of the first cable, as is apparent from the equation (5), And the overall spring constant k2 of the second support member and the overall spring constant k4 of the second cable and the first and second support members when the axial force N is equal to or greater than the pretension of the second cable. be able to.

  Therefore, the effect by the invention which concerns on Claim 6, ie, the effect that it can prevent that an excessive stress generate | occur | produces in a structure, a mass damper, and a 1st and 2nd support member can be acquired reliably. In addition, since the first and second cables are wound around the first and second pins, respectively, both can be arranged more compactly than in the case where the first and second cables are not wound.

  The invention according to claim 8 is the vibration suppressing device according to claim 6, wherein the connection portion between the one end portion of the first cable and the first support member, and the other end portion of the first cable and the first beam. At least one of the connecting portions is provided with a first elastic body, and the connecting portion between the one end of the second cable and the second support member, and the connection between the other end of the second cable and the first beam. At least one of the portions is provided with a second elastic body.

  According to this configuration, at least one of the connection portion between the one end portion of the first cable and the first support member and the connection portion between the other end portion of the first cable and the first beam has the first elastic body. Is provided. For this reason, the one end portion of the first support member is held in a state of contacting the first portion of the first beam by the first elastic body deforming according to the pretension of the first cable. When the axial force N described in the description of the invention according to item 6 exceeds the pretension of the first cable, the first support member is thereby separated from the first beam. As is clear from the above, by appropriately setting the rigidity (spring constant) of the first elastic body, the first cable, the first elastic body, and the first elastic body when the axial force N is equal to or greater than the pretension of the first cable. The overall spring constant of the first and second support members can be further reduced.

  Similarly, a second elastic body is provided on at least one of the connection portion between the one end portion of the second cable and the second support member and the connection portion between the other end portion of the second cable and the first beam. Yes. Therefore, the one end portion of the second support member is held in a state in which the second elastic body is in contact with the second portion of the first beam by the deformation of the second elastic body according to the pretension of the second cable. When the axial force N described in the description of the invention according to item 6 becomes equal to or greater than the pretension of the second cable, the second support member is thereby separated from the first beam. As is apparent from the above, by appropriately setting the rigidity (spring constant) of the second elastic body, the second cable, the second elastic body, the second elastic body when the axial force N is equal to or greater than the pretension of the second cable. The overall spring constant of the first and second support members can be further reduced.

  As described above, as with the invention according to claim 7, the effect of the invention according to claim 6, that is, the effect of preventing excessive stress from being generated in the structure, the mass damper, and the first and second support members, You can definitely get it.

It is a front view which shows the vibration suppression apparatus by 1st Embodiment of this invention with a part of structure to which this is applied. It is a side view which expands and shows a guide mechanism. It is sectional drawing of a 1st mass damper. It is sectional drawing which follows the IV-IV line of FIG. It is a front view which expands and shows a part of vibration suppressing device and lower beam by 2nd Embodiment of this invention. It is sectional drawing which follows the VI-VI line of FIG. It is a front view which expands and shows a modification of 2nd Embodiment, and a part of lower beam. It is sectional drawing which follows the VIII-VIII line of FIG. It is a figure which models the conventional vibration suppression apparatus with a pair of pillars and a pair of beams, with (a) when the structure is not vibrating and (b) when the structure is vibrating. FIG. 4 is a diagram illustrating a vibration suppression device according to the present invention, modeled together with a pair of columns and a pair of beams, (a) when the structure is not vibrating, and (b) when the structure is vibrating. The relationship between the reaction force of the mass damper and the first and second support members in the vibration suppressing device of the present invention is as follows. (A) When the axial force due to the reaction force of the mass damper is smaller than the pretension of the first cable, (b) It is a figure which shows and models each about the case where axial force N is more than the pretension of a 1st cable. It is a figure which shows the relationship between the reaction force of a mass damper, and the displacement of the other end part of a 1st and 2nd support member.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The structure S shown in FIG. 1 includes left and right pillars PL and PR extending vertically in parallel to each other and a plurality of beams BU, BM1, BM2, and BD extending in parallel in the left and right directions (only four in FIG. 1). Is a high-rise building having a cross-beam shaped ramen structure joined to each other, and is erected on the ground (not shown). Hereinafter, the four beams BU, BM1, BM2, and BD shown in FIG. 1 are referred to as “upper beam BU”, “first intermediate beam BM1”, “second intermediate beam BM2”, and “lower beam BD” in order from the upper side.

  The left and right pillars PL and PR and the upper and lower beams BU and BD are all made of H-shaped steel. Note that the left and right pillars PL and PR, and the upper and lower beams BU and BD may be formed of square steel pipes or the like. Further, the configurations of the first and second intermediate beams BM1 and BM2 are different from the configurations of the upper and lower beams BU and BD, and detailed description thereof will be described later.

  As shown in FIG. 1, the vibration suppression device according to the first embodiment of the present invention includes a first support member 2, a second support member 3, a first mass damper 4, and a second mass damper 5. The 1st support member 2 is comprised with the pillar material which consists of H type steel, and the lower end part 2a is joined and connected to 1st site | part R1 mentioned later of lower beam BD. The first support member 2 extends obliquely from the first portion R1 toward the upper beam BU, and penetrates the first and second intermediate beams BM1 and BM2 in the vertical direction.

  The 2nd support member 3 is comprised with the pillar material which consists of H-shaped steel like the 1st support member 2, The lower end part 3a is joined and connected with 2nd site | part R2 mentioned later of lower beam BD. . The second support member 3 extends obliquely from the second portion R2 toward the upper beam BU, and penetrates the first and second intermediate beams BM1 and BM2 in the vertical direction. Further, the upper ends of the first and second support members 2 and 3 are connected to each other via the first connecting member 6, and are symmetrical to each other in the left-right direction around a vertical line extending from the first connecting member 6. Are arranged in an inverted V shape. In addition, you may comprise the 1st and 2nd support members 2 and 3 with another pillar material, for example, a square steel pipe.

  The position of the first part R1 is such that the length from the axis AL of the left pillar PL to the center of the first part R1 is the length between the axes AL and AR of the left and right pillars PL and PR (hereinafter referred to as “the first part R1”). It is set to be approximately 1/4 (= L / 4) of L) (referred to as “length between left and right columns”). The center of the lower end 2a of the first support member 2 coincides with the center of the first part R1. The position of the second part R2 is such that the length from the axis AR of the right column PR to the center of the second part R2 is approximately ¼ (= L / 4) of the length L between the left and right columns. Is set. The center of the lower end portion 3a of the second support member 3 coincides with the center of the second portion R2.

  Moreover, the 2nd connection member 7 is attached to the upper surface of the 1st connection member 6 mentioned above, and the guide mechanism 11 is provided between the 2nd connection member 7 and the upper side beam BU. The guide mechanism 11 is for guiding the first and second support members 2 and 3 to move in the left-right direction with respect to the upper beam BU when the structure S vibrates. As shown in the figure, a pair of base portions 12, 12 provided integrally on the lower surface of the upper beam BU, a pair of first guide protrusions 13, 13 provided integrally on the lower surface of each base portion 12, and a second connecting member 7 has a second guide protrusion 14 integrally provided on the upper surface of the member 7.

  The pair of base portions 12 and 12 are disposed at a central portion in the longitudinal direction of the upper beam BU at a predetermined interval, and the pair of first guide protrusions 13 and 13 are arranged in the front-rear direction (see FIG. 1 in the depth direction) with a predetermined interval. The second guide protrusion 14 extends in the left-right direction over the entire second connecting member 7 and is disposed between the pair of first guide protrusions 13 and 13.

  Since the first and second mass dampers 4 and 5 are configured in the same manner as that disclosed in Japanese Patent Application No. 2012-158921 proposed by the inventor of the present invention, these first and second mass dampers 4 will be described below. 5 will be briefly described. As shown in FIG. 3, the first mass damper 4 includes an inner cylinder 21, a ball screw 22, a first rotating mass 23, and a limiting mechanism 24. The inner cylinder 21 is made of a cylindrical steel material. One end of the inner cylinder 21 is open, and the other end is attached to the first flange 25 via a universal joint.

  The ball screw 22 has a screw shaft 22a and a nut 22c that is screwed to the screw shaft 22a via a large number of balls 22b. One end of the screw shaft 22a is accommodated in the opening of the inner cylinder 21 described above, and the other end of the screw shaft 22a is attached to the second flange 26 via a universal joint. The nut 22 c is rotatably supported by the inner cylinder 21 via a bearing 27.

  The first rotating mass 23 is made of a material having a large specific gravity, for example, iron, and is formed in a cylindrical shape. The first rotating mass 23 covers the inner cylinder 21 and the ball screw 22 and is rotatably supported by the inner cylinder 21 via a bearing 28. Between the first rotating mass 23 and the inner cylinder 21, a pair of ring-shaped sealing materials 29, 29 are provided. A space formed by the sealing materials 29, 29, the first rotating mass 23 and the inner cylinder 21 is filled with a viscous body 30 made of silicon oil.

  In the first mass damper 4 configured as described above, when a relative displacement occurs between the inner cylinder 21 and the screw shaft 22a, the limiting mechanism 24 is operated in a state where the relative displacement is converted into a rotational motion by the ball screw 22. The first rotary mass 23 is rotated by being transmitted to the first rotary mass 23 via the first rotary mass 23. Hereinafter, the operation of the first mass damper 4 that converts the relative displacement between the inner cylinder 21 and the screw shaft 22a into the rotational motion of the first rotary mass 23 in this way is referred to as “rotational conversion operation of the first mass damper 4”.

  The restriction mechanism 24 restricts the rotational conversion operation of the first mass damper 4 and includes a ring-shaped rotary sliding material 24a, a plurality of screws 24b, and springs 24c (only two are shown). The rotary sliding material 24 a is disposed between the first rotary mass 23 and the nut 22 c of the ball screw 22. A plurality of spring accommodating holes 23a are formed in the portion of the first rotating mass 23 where the rotating sliding material 24a is disposed. These spring accommodating holes 23a are arranged at equal intervals in the circumferential direction and penetrate in the radial direction. A screw 24b is screwed into each spring accommodation hole 23a, and a spring 24c is accommodated between the screw 24b and the rotary sliding material 24a.

  With the above configuration, when the screw 24b is strongly tightened, the rotary sliding member 24a is strongly pressed against the nut 22c by the urging force of the spring 24c, whereby the first rotary mass 23 is integrated with the nut 22c via the rotary sliding member 24a. It becomes the state connected to.

  Further, when the screw 24b is loosened from this state, the tightening degree is lowered, and the load acting in the axial direction of the first mass damper 4 (hereinafter referred to as “axial load”) is determined according to the tightening degree of the screw 24b. The first rotating mass 23 rotates integrally with the nut 22c until the limit load is reached. On the other hand, when the axial load of the first mass damper 4 reaches the limit load, the rotation conversion operation of the first mass damper 4 is limited by the occurrence of slippage between the rotating sliding material 24a and the nut 22c or the first rotating mass 23. Is done. In this state, the rotational inertia force of the first rotary mass 23 reduced due to the restriction of the rotational conversion operation of the first mass damper 4 due to the frictional resistance generated between the rotary sliding material 24 a and the nut 22 c or the first rotary mass 23. Be compensated.

  The first flange 25 of the first mass damper 4 is attached to a fixture 8 provided integrally with the left end of the upper beam BU, whereby the first mass damper 4 is connected to the upper beam BU. The second flange 26 is attached to the left side surface of the second connecting member 7, whereby the first mass damper 4 is connected to the first and second support members 2 and 3. The first mass damper 4 is only allowed to rotate with respect to the fixture 8 and the second connecting member 7 about the axis extending in the front-rear direction by the universal joints of the first and second flanges 25 and 26.

  Similar to the first mass damper 4, the second mass damper 5 includes an inner cylinder 31, a screw shaft 32 a, a second rotating mass 33, first and second flanges 35 and 36, and the configuration thereof is the same as that of the first mass damper 4. Since they are exactly the same, their detailed description is omitted. The first flange 35 of the second mass damper 5 is attached to a fixture 9 provided integrally at the right end of the upper beam BU, whereby the second mass damper 5 is connected to the upper beam BU. The second flange 36 is attached to the right side surface of the second connecting member 7, whereby the second mass damper 5 is connected to the first and second support members 2 and 3. As described above, the first and second mass dampers 4 and 5 are provided symmetrically with respect to the second connecting member 7. The second mass damper 5 is only allowed to rotate with respect to the fixture 9 and the second connecting member 7 about the axis extending in the front-rear direction by the universal joints of the first and second flanges 35 and 36.

  Further, the rigidity (spring constant) of the first and second support members 2 and 3 and the mass of the first and second rotating masses 23 and 33 are the same as those of the first and second support members 2 and 3 and the first and second members. The natural frequency of the additional vibration system including the mass dampers 4 and 5 is set so as to be synchronized with the primary natural frequency of the structure S. The primary natural frequency is a natural frequency when the vibration mode of the structure S is the primary mode.

  The rigidity of the first and second support members 2 and 3 and the masses of the first and second rotating masses 23 and 33 are the same as the n-th order natural vibration of the additional vibration system whose natural frequency is the second or higher order of the structure S. You may set so that it may synchronize with a number (n = 2, 3, ...). Alternatively, in order not to lower the damping effect against various seismic motion inputs (transient response) and design specification fluctuations, the rigidity of the first and second support members 2 and 3 is set to an optimum tuning condition in an arbitrary mode based on a fixed point theory. It may be set to about 1.2 times the solution. Here, the optimum tuning condition solution in an arbitrary mode based on the fixed point theory means that the natural frequency of the additional vibration system including the first and second support members 2 and 3 and the first and second mass dampers 4 and 5 is the structure. The solution for optimal tuning to the natural frequency of any vibration mode of S is shown.

  Next, the configuration of the first and second intermediate beams BM1 and BM2 will be described. Since the first and second intermediate beams BM1 and BM2 are configured similarly to each other, the first intermediate beam BM1 will be described as a representative of both.

  As shown in FIGS. 1 and 4, the first intermediate beam BM1 includes a pair of beam members 41 and 41 facing each other in the front-rear direction, and a pair of upper and lower connecting plates 42 and 42 that connect the 41 and 41 to each other. Has been. Each beam member 41 is made of a steel material, and the left end portion thereof is joined to the left pillar PL and the right end portion thereof is joined to the right pillar PR, and extends horizontally in the left-right direction. The first and second support members 2, 3 penetrate vertically between the pair of beam members 41, 41, and the pair of beam members 41, 41, the first and second support members 2, 3, There is a slight gap between them.

  Each connecting plate 42 is made of a steel plate, and is arranged at a position that does not interfere with the first and second support members 2 and 3 including when the structure S vibrates (see FIG. 1). ). Further, a surface material 43 made of a material having slipperiness, for example, a fluororesin, is attached to each of the surfaces of the pair of beam members 41, 41 facing the first and second support members 2, 3. Yes.

  As described above, according to the first embodiment, the lower end portion 2a of the first support member 2 made of a pillar material is joined and connected to the predetermined first portion R1 of the lower beam BD. The first portion R1 extends obliquely toward the upper beam BU. In addition, the second support member 3 made of a pillar material has a lower end portion 3a joined and connected to a predetermined second portion R2 of the lower beam BD, toward the upper beam BU from the second portion R2. It extends diagonally. Furthermore, the upper ends of the first and second support members 2 and 3 are connected to each other via the first connecting member 6, and the first and second mass dampers 4 and 5 are connected to the upper ends of the two and 3, respectively. Are connected via first and second connecting members 6, 7.

  Further, the first portion R1 is substantially ¼ of the length L between the left and right columns (the length between the axis lines AL and AR of the left and right columns PL and PR) from the left column PL to the right column PR. The position is set to (= L / 4). Further, the second portion R2 is set at a position that is approximately 1/4 (= L / 4) of the length L between the left and right columns from the right column PR toward the left column PL.

  As described above, when the structure S vibrates, as described with reference to FIG. 10 described above, the first and second mass dampers 4 and 5 have the relative displacement between the upper and lower beams BU and BD and the first displacement. Since a larger displacement obtained by adding the displacements of the first and second support members 2 and 3 is transmitted, the structure is constituted by the additional vibration system including the first and second support members 2 and 3 and the first and second mass dampers 4 and 5. The effect of absorbing the vibration of the object S can be sufficiently obtained, and hence the vibration of the structure S can be appropriately suppressed. In this case, the displacement of the upper end portions of the first and second support members 2 and 3 utilizing the bending deformation of the lower beam BD can be maximized, so that it is transmitted to the first and second mass dampers 4 and 5. Displacement can be further increased, and hence vibration of the structure S can be more appropriately suppressed.

  Further, since the first and second support members 2 and 3 are respectively connected to the first and second portions R1 and R2 between the two joint portions with the left and right columns PL and PR in the lower beam BD. When the structure S vibrates, the first and second support members 2 and 3 are deformed (displaced) against the reaction force of the first and second mass dampers 4 and 5 as compared with the conventional case described above. It becomes easy and the substantial rigidity of the 1st and 2nd support members 2 and 3 becomes low. For this reason, it is possible to use a small mass damper having a relatively small mass of the rotating mass as the first and second mass dampers 4 and 5, thereby reducing the size of the entire apparatus and reducing the manufacturing cost. it can.

  Further, the first and second intermediate beams BM1 and BM2 are provided between the upper beam BU and the lower beam BD, and accordingly, the upper beam BU and the lower beam BD are greatly separated in the vertical direction. The displacement transmitted to the first and second mass dampers 4 and 5 can be increased, and the vibration of the structure S can be suppressed more appropriately.

  Further, a pair of beam members 41, 41 of the first and second intermediate beams BM1, BM2 are connected to each other and opposed in the front-rear direction, and the first and second supports are provided between the beam members 41, 41. The members 2 and 3 penetrate vertically. Thereby, since the 1st and 2nd support members 2 and 3 can be displaced without trouble with respect to the 1st and 2nd intermediate beams BM1 and BM2 at the time of vibration of structure S, both support members 2 and 3 Thus, the displacement can be appropriately transmitted to the first and second mass dampers 4 and 5, and thus the above-described effects can be appropriately obtained.

  For the same reason, buckling and twisting in the weak axis direction of the first and second support members 2 and 3 due to the reaction force and reaction force torque of the first and second mass dampers 4 and 5 are caused by the pair of beam members 41 and 41. Can be prevented. Therefore, the displacement of the structure S transmitted to the first and second mass dampers 4 and 5 via the first and second support members 2 and 3 is affected by the reaction force and reaction torque of both mass dampers 4 and 5. Without being received, it can be satisfactorily converted into the rotational motion of the first and second rotary masses 23, 33, whereby the vibration of the structure S can be appropriately suppressed. Moreover, the effect of preventing buckling and twisting in the weak axis direction of the first and second support members 2 and 3 described above can be obtained by using the existing first and second intermediate beams BM1 and BM2.

  Furthermore, since the first and second mass dampers 4 and 5 are provided symmetrically with respect to the upper ends of the first and second support members 2 and 3, the reaction torques of the mass dampers 4 and 5 are It can act to counteract each other. Thereby, combined with the effect of preventing the buckling and twisting in the weak axis direction by the pair of beam members 41 and 41 described above, the first and second support by the reaction force torque of the first and second mass dampers 4 and 5 is achieved. It is possible to reliably prevent the members 2 and 3 from being twisted.

  In addition, a surface material 43 made of a material having a slipperiness is attached to each of the surfaces of the pair of beam members 41, 41 facing the first and second support members 2, 3. Even when the first and second support members 2 and 3 are in contact with the beam members 41 and 41 when the object S vibrates, both the support members 2 and 3 can be smoothly displaced. The displacement can be appropriately transmitted to the second mass dampers 4 and 5.

  Next, a vibration suppressing device according to a second embodiment of the present invention will be described with reference to FIGS. The main difference of the second embodiment with respect to the first embodiment is that the lower ends 2a and 3a of the first and second support members 2 and 3 are respectively connected to the first and second portions R1 and R2 of the lower beam BD. It is not fixed and is connected to the first and second portions R1 and R2 via a pair of first cables 51 and 51 and a second cable (not shown), respectively. In FIG.5 and FIG.6, the same code | symbol is attached | subjected about the same component as 1st Embodiment. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIGS. 5 and 6, the pair of first cables 51, 51 are provided symmetrically in the front-rear direction around the first support member 2. Each first cable 51 is made of a steel wire, one end of which is connected to the lower part of the first support member 2 via the first mounting plate 52, and the other end is connected via the second mounting plate 53. It is connected to the first part R1 of the lower beam BD and extends in the length direction of the first support member 2. The first cable 51 is given a predetermined pretension.

  The first mounting plate 52 is made of a steel plate and is supported at three points including a pair of flanges 2b, 2b and a web 2c of the first support member 2, and its main surface is the length of the first support member 2. They are arranged so as to be orthogonal to the vertical direction. Further, the side surface of the first mounting plate 52 is flush with the side surfaces of the flanges 2b and 2b. Further, the first mounting plate 52 is formed with a mounting hole 52 a penetrating in the length direction of the first support member 2. One end portion of the first cable 51 is inserted into the attachment hole 52a from below and protrudes upward from the attachment hole 52a. At one end portion, a screw is cut and a nut 54 is screwed and fixed. Yes. The nut 54 is held in contact with the upper surface of the first mounting plate 52 by the pretension of the first cable 51 described above.

  The second mounting plate 53 is made of a steel plate, like the first mounting plate 52, and is supported at three points including a pair of support plates 55 and 55 and a web WE of the lower beam BD. The main surface is arranged so as to be orthogonal to the length direction of the first support member 2. Each of these support plates 55 and 55 is made of a steel plate and is supported at three points including upper and lower flanges FL and FL of the lower beam BD and the web WE, and the main surface thereof is the length of the lower beam BD. They are arranged so as to be orthogonal to the vertical direction. The second mounting plate 53 and the support plates 55 and 55 are accommodated in a space defined by the flanges FL and FL of the lower beam BD and the web WE.

  Furthermore, the lower end 2a of the first support member 2, the upper flange FL of the lower beam BD, and the second mounting plate 53 are respectively provided with a guide hole 2d and a guide hole penetrating in the length direction of the first support member 2. APs and attachment holes 53a are formed. The guide hole 2d, the guide hole AP, and the attachment hole 53a are arranged on the same straight line as the attachment hole 52a of the first attachment plate 52 described above, and the center of the guide hole AP of the lower beam BD is the first thereof. It coincides with the center of one site R1. 5 illustrates the front guide hole 2d, the guide hole AP, and the attachment hole 53a with the first support member 2 as the center, but the guide hole 2d, the guide hole AP, and the mounting hole 53a are also illustrated on the rear side. Of course, the mounting hole 53a is provided.

  The first cable 51 is inserted from above in the order of the guide hole 2d of the first support member 2, the guide hole AP of the lower beam BD, and the attachment hole 53a of the second attachment plate 53, and the other end from the attachment hole 53a. The other end portion is also threaded, and a nut 56 is screwed together and fixed. The nut 56 is held in contact with the lower surface of the second mounting plate 53 by the pre-tension of the first cable 51 described above.

  The lower end 2a of the first support member 2 is not fixed to the first part R1 of the lower beam BD but is in contact with the first part R1 by the first cable 51 to which pretension is applied. It is held in the state. As described above, the lower end 2 a of the first support member 2 is connected to the first part R <b> 1 via the pair of first cables 51 and 51.

  The first cable 51 is wound around the first pin 57 in the middle thereof. The first pin 57 is attached to the web 2c of the first support member 2, and is disposed between the first attachment plate 52 and the lower end 2a of the first support member 2, and is in the front-rear direction (depth direction in FIG. 5). Slightly extended. Moreover, the support plate 58 comprised with the steel plate is attached to the site | part corresponding to the 1st pin 57 of the flanges 2b and 2b of the 1st support member 2, The main surface of the support plate 58 is the front-back direction. It arrange | positions so that it may orthogonally cross. The first pin 57 is inserted into a hole (not shown) formed in the support plate 58. With the above configuration, the first pin 57 is supported at two points including the web 2 c and the support plate 58 of the first support member 2.

  Although not shown, the pair of second cables are made of steel wire like the first cable 51, and are provided symmetrically in the front-rear direction with the second support member 3 as the center. Each of the second cables has one end and the other end connected to the second support member 3 and the lower beam BD, respectively, and a second pin attached to the second support member 3 in the middle thereof. (Not shown). Since the configuration for connecting the second cable is the same as that of the first cable 51, detailed description thereof is omitted.

  Further, the lower end portion 3a of the second support member 3 is in contact with the second portion R2 of the lower beam BD without being fixed, and is in contact with the second portion R2 by the second cable to which pretension is applied. It is held in the state. As described above, the lower end portion 3a of the second support member 3 is connected to the second portion R2 via the pair of second cables.

  As described above, according to the second embodiment, the lower end 2a of the first support member 2 is in contact with the first portion R1 of the lower beam BD without being fixed, and the first tension is applied. One end and the other end of one cable 51 are connected to the first support member 2 and the lower beam BD, respectively. The lower end portion 2a of the first support member 2 is held in contact with the first portion R1 by the first cable 51. That is, the lower end portion 2a of the first support member 2 is connected to the first cable 51. Via the first region R1. Similarly, the lower end 3a of the second support member 3 is in contact with the second portion R2 of the lower beam BD without being fixed, and one end and the other end of the second cable to which pretension is applied are The second support member 3 and the lower beam BD are connected to each other. The lower end portion 3a of the second support member 3 is held in contact with the second portion R2 by the second cable, that is, the lower end portion 3a of the second support member 3 is interposed via the second cable. , Connected to the second region R2.

  As described above, as described with reference to FIGS. 11 and 12 described above, the rigidity (spring constant) of the first and second support members 2 and 3 and the first and second cables 51 is the first and second mass dampers. It has bilinear characteristics with respect to 4 and 5 reaction forces. Therefore, before the reaction force of the first and second mass dampers 4 and 5 becomes excessive as the displacement of the first and second support members 2 and 3 increases, the first and second support members 2 and 3, etc. Since a smaller rigidity can be obtained as the rigidity, the natural frequency of the additional vibration system including the first and second mass dampers 4 and 5 can be made different from the primary natural frequency of the structure S. The reaction force of the first and second mass dampers 4 and 5 can be suppressed. As a result, excessive stress is generated in the structure S, the first and second support members 2 and 3, and the first and second mass dampers 4 and 5. Can be prevented.

  In addition, the first cable 51 is wound around the first pin 57 provided on the first support member 2 in the middle, and the second cable is attached to the second support member 3 in the middle. It is wound around the second pin. As a result, by increasing the lengths of the first and second cables 51, the first cable 51 in the case where the axial force N is equal to or greater than the pretension of the first cable 51, as is apparent from the equation (5). The second cable, the first and second support members 2, 3 when the overall spring constant (k2) of the first and second support members 2, 3 and the axial force N are equal to or greater than the pretension of the second cable. The overall spring constant (k4) can be made smaller. Therefore, the above-described effect, that is, the effect of preventing an excessive stress from being generated in the structure S or the like can be reliably obtained. Moreover, since the 1st and 2nd cable 51 is wound around the 1st and 2nd pin 57, respectively, both 51 can be arrange | positioned compactly compared with the case where it does not wind.

  Furthermore, the upper part of the first cable 51, the first mounting plate 52, the nut 54, and the first pin 57 are provided in the space formed by the flanges 2b, 2b of the first support member 2 and the web 2c, and the first Since the lower portion of the cable 51, the second mounting plate 53 support plates 55 and 55, and the nut 56 are provided in the space formed by the flanges FL and FL of the lower beam BD and the web WE, the first cable 51 and the like The entire apparatus can be made compact without causing each component to protrude significantly from the first support member 2 and the lower beam BD. This effect can be similarly obtained for each component such as the second cable.

  Next, a modification of the second embodiment will be described with reference to FIGS. As shown in FIGS. 7 and 8, in this modification, the first pin 57 for winding the first cable 51 is not provided, and although not shown, the first pin 57 for winding the second cable is not provided. There are no two pins. Furthermore, a first disc spring 61 is provided between the nut 54 and the first mounting plate 52, that is, at a connection portion between the first cable 51 and the first support member 2. The first disc spring 61 is a so-called eight-stage type in which eight spring washers 61a are alternately stacked in different directions. The above configuration is the same for the second cable, and a second disc spring (not shown) is provided at a connection portion between the one end of the second cable and the second support member 3.

  As described above, according to this modification, since the first disc spring 61 is provided at the connection portion between the first cable 51 and the first support member 2, the lower end 2 a of the first support member 2 is The first disc spring 61 is held in contact with the first portion of the lower beam BD by being deformed according to the pretension of the first cable 51. Similarly, since the 2nd disc spring is provided in the connection part of the 2nd cable and the 2nd support member, the 2nd disc spring is the pretension of the 2nd cable in the lower end part 3a of the 2nd support member 3. By being deformed according to the above, the second beam BD is held in contact with the second portion of the lower beam BD.

  From the above, as described in the description of the invention according to claim 8, the axial force N (see FIG. 11) is reduced by the first cable 51 by appropriately setting the rigidity (spring constant) of the first disc spring 61. The overall spring constant of the first cable 51, the first disc spring 61, the first and second support members 2 and 3 when the tension is equal to or greater than the pretension can be further reduced, and the axial force N is smaller than that of the second cable. The overall spring constant of the second cable, the second disc spring, and the first and second support members 2 and 3 when the tension is equal to or greater than the pretension can be further reduced. Therefore, as in the second embodiment, the effect of preventing the generation of excessive stress on the structure S, the first and second support members 2 and 3, and the first and second mass dampers 4 and 5 is ensured. Can get to.

  Note that at least one of the one end portion and the other end portion of the first cable 51 may be attached to the first and second attachment plates 52 and 53 by welding or the like without using the nuts 54 and 56 (about a modification). (Only the other end of the first cable 51). Moreover, although the 1st cable 51 is provided so that it may extend in the length direction of the 1st support member 2, you may provide it so that it may extend vertically. Furthermore, although the one end part of the 1st cable 51 is connected with the lower part of the 1st support member 2, you may connect with the arbitrary site | parts of the 1st support member 2. FIG. Moreover, although the other end part of the 1st cable 51 is connected with 1st site | part R1 of lower beam BD, you may connect with the arbitrary site | parts of lower beam BD. The above applies similarly to the second cable.

  In addition, this invention can be implemented in various aspects, without being limited to embodiment described (1st and 2nd embodiment and a modification are included). For example, in the embodiment, when the first portion R1 is moved from the left column PL toward the right column PR side, the length L between the left and right columns (the left and right columns PL, PR, the axis lines AL, AR between the left and right directions). Is set at a position 1/4 of the length of the other), but in the lower beam BD, other appropriate positions between the joint with the left column PL and the center between the left and right columns PL and PR. May be set. Similarly, the second portion R2 is set at a position that is ¼ of the length L between the left and right columns from the right column PR toward the left column PL, but the right column PR in the lower beam BD May be set at another appropriate position between the joint portion and the center between the left and right pillars PL and PR. In this case, the length from the left pillar PL to the first part and the length from the right pillar PR to the second part may be set to the same size or different from each other. Good.

  In the embodiment, the lower ends 2a and 3a of the first and second support members 2 and 3 are connected to the first and second portions R1 and R2 of the lower beam BD, respectively, and the first and second mass dampers are connected. 4 and 5 are connected to the upper beam BU, but upside down, that is, the upper ends of the first and second support members are connected to the first and second portions of the upper beam, respectively. The first and second mass dampers may be coupled to the lower beam. Further, in the embodiment, the first and second support members 2 and 3 are provided so as to be symmetric with respect to the upper end portion thereof, but may be provided so as not to be symmetric with each other.

  In the embodiment, the first and second mass dampers 4 and 5 are arranged so as to be symmetric with respect to the upper ends of the first and second support members 2 and 3. 2 You may arrange | position so that it may mutually overlap in the front-back direction on the left or right side of the upper end part of the supporting members 2 and 3. FIG. Further, in the embodiment, two mass dampers including the first and second mass dampers 4 and 5 are used as the mass damper in the present invention, but the number of mass dampers may be one or three or more. In the embodiment, the viscous body 30 is provided in the first and second mass dampers 4 and 5. However, the viscous body 30 may be omitted.

  Furthermore, in the embodiment, the surface material 43 is affixed to each of the surfaces of the pair of beam members 41, 41 facing the first and second support members 2, 3, but instead of or together with this. The first and second support members 2 and 3 may be attached to each of the surfaces facing the pair of beam members 41 and 41. In the embodiment, the first intermediate beam BM1 is composed of a pair of beam members 41, 41 and a pair of connecting plates 42, 42. You may comprise with a H-shaped steel or a square steel pipe, and you may comprise a part other than that with a pair of beam materials 41 and 41 and a pair of connecting plates 42 and 42. FIG. Also in this case, it goes without saying that each connecting plate 42 is disposed at a position where it does not interfere with the first and second support members 2 and 3. This variation of the first intermediate beam BM1 applies similarly to the second intermediate beam BM2. Furthermore, in the embodiment, the number of the third beams in the present invention is two of the first and second intermediate beams BM1, BM2, but may be one, three or more, or both BM1, BM2 It may be omitted.

  In the embodiment, the first and second pins 57 are attached to the first and second support members 2 and 3, respectively, but instead of or together with this, they may be attached to the lower beam BD. . Alternatively, the first and second pins 57 may be omitted. Furthermore, in the embodiment, the first disc spring 61 is provided at the connecting portion between the one end portion of the first cable 51 and the first support member 2, but instead of or together with this, You may provide in the connection part of an other end part and lower beam BD. The same applies to the second disc spring. Alternatively, the first and second disc springs 61 may be omitted. In the embodiment, the first and second disc springs 61 are used as the first and second elastic bodies in the present invention, respectively, but other elastic bodies, for example, other springs such as coil springs, rubber, etc. Etc. may be used.

  Further, the embodiment is an example in which the vibration suppressing device according to the present invention is applied to the pair of left and right columns PL and PR, but the present invention is not limited to this, and is applicable to a pair of front and rear columns. is there. Of course, the variations described so far may be combined as appropriate. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

S Structure PL Left column (one of a pair of columns)
PR right pillar (the other of a pair of pillars)
BU Upper beam (second beam)
BD Lower beam (first beam)
R1 1st site | part R2 2nd site | part 2 1st support member 2a Lower end part (one end part of a 1st support member)
3 Second support member 3a Lower end (one end of the second support member)
4 First mass damper (mass damper)
5 Second mass damper (mass damper)
23 First rotation mass (rotation mass)
33 Second rotation mass (rotation mass)
BM1 first intermediate beam (third beam)
BM2 Second intermediate beam (third beam)
41 Beam material 43 Surface material 51 First cable 57 First pin 61 First disc spring (first elastic body)

In order to achieve the above object, the invention according to claim 1 has a cross-beam-like frame structure in which a pair of pillars extending vertically in parallel with each other and a pair of upper and lower beams extending horizontally in parallel with each other are joined together. A vibration suppressing device for suppressing vibration of a structure, which is composed of a pillar material, one end of which is one of a pair of beams, a first beam that is one of a pair of beams, A first support member connected to a predetermined first part between the center between the pillars and extending obliquely from the first part toward the second beam which is the other of the pair of beams, and a pillar material; One end of the first beam is connected to a predetermined second part between the joint of the first beam with the other of the pair of pillars and the center between the pair of pillars, and is inclined from the second part toward the second beam. And the other end of the second support member connected to the other end of the first support member, A rotating mass having one end and one end connected to the second beam and the other end connected to the other ends of the first and second support members. A mass damper that converts the relative displacement between the pair of beams transmitted through the two support members into a rotational motion of the rotary mass ; and the first portion is directed from one column toward the other column, The position of the second portion is set to approximately 1/4 of the length between the pair of columns, and the second portion is approximately 1/4 of the length between the pair of columns from the other column toward the one column. 4 is set .

In the present specification and claims, “joining” refers to connecting a plurality of members to each other by bolts or welding.
In addition, as described with reference to FIG. 10, when the pair of columns is bent and deformed to one side or the other side in the length direction of the beam at the time of vibration of the structure, the pair of beams are almost sinusoidal. Bend and deform. In this case, assuming that the length between the axes of the pair of columns is L, the portion of the pair of beams at a position approximately L / 4 from the axis of each of the pair of columns is The largest bending deformation is made upward or downward.
According to the configuration described above, the first portion, that is, the connection portion of the first beam with the first support member has a length (L) between the pair of columns from one column toward the other column side. The position is set to almost 1/4. Further, the second portion, that is, the connecting portion of the first beam to the second support member is approximately ¼ of the length (L) between the pair of columns from the other column toward the one column side. Set to position. As described above, when the structure vibrates, the displacement of the other end portions of the first and second support members using the bending deformation of the first beam can be maximized, so that the displacement transmitted to the mass damper is further increased. As a result, the vibration of the structure can be more appropriately suppressed.

The invention according to claim 2 is the vibration suppressing device according to claim 1 , wherein the first and second beams are horizontally extended in parallel with the first and second beams and joined to a pair of columns. The third beam is provided.

The invention according to claim 3, in the vibration suppression apparatus according to claim 2, 3 beams are connected to each other, has a pair of beam members that faces the horizontal direction, the first and second support members Is characterized by penetrating vertically between a pair of beam members.

According to this configuration, the pair of beam members of the third beam are connected to each other and face in the horizontal direction, and the first and second support members pass through between the pair of beam members. As a result, when the structure vibrates, the first and second support members can be displaced without hindrance with respect to the third beam. Therefore, the displacement can be appropriately transmitted to the mass damper via both support members, and thus The effect according to claim 2 can be appropriately obtained.

The invention according to claim 4 is the vibration suppressing device according to claim 3 , wherein at least one of the first support member and the pair of beam members facing each other and the second support member and the pair of beam members facing each other. A surface material having slipperiness is affixed to at least one of the surfaces.

According to a fifth aspect of the present invention, in the vibration suppressing device according to any one of the first to fourth aspects, the one end portions of the first and second support members abut each other without being fixed to the first and second portions. And is composed of a steel wire, pretensioned, one end connected to the first support member, the other end connected to the first beam, and a steel wire, And a second cable having one end connected to the second support member and the other end connected to the first beam while being pretensioned.

The invention according to claim 6 is the vibration suppressing device according to claim 5 , wherein a first pin is attached to at least one of the first support member and the first beam, and at least one of the second support member and the first beam. On one side, a second pin is attached, and the first and second cables are wound around the first and second pins, respectively.

Therefore, the effect by the invention which concerns on Claim 5 , ie, the effect that it can prevent that an excessive stress generate | occur | produces in a structure, a mass damper, and a 1st and 2nd support member can be acquired reliably. In addition, since the first and second cables are wound around the first and second pins, respectively, both can be arranged more compactly than in the case where the first and second cables are not wound.

The invention according to claim 7 is the vibration suppressing device according to claim 5 , wherein the connection portion between the one end portion of the first cable and the first support member, and the other end portion of the first cable and the first beam. At least one of the connecting portions is provided with a first elastic body, and the connecting portion between the one end of the second cable and the second support member, and the connection between the other end of the second cable and the first beam. At least one of the portions is provided with a second elastic body.

According to this configuration, at least one of the connection portion between the one end portion of the first cable and the first support member and the connection portion between the other end portion of the first cable and the first beam has the first elastic body. Is provided. For this reason, the one end portion of the first support member is held in a state of contacting the first portion of the first beam by the first elastic body deforming according to the pretension of the first cable. When the axial force N described in the description of the invention according to item 5 is equal to or greater than the pretension of the first cable, the first support member is thereby separated from the first beam. As is clear from the above, by appropriately setting the rigidity (spring constant) of the first elastic body, the first cable, the first elastic body, and the first elastic body when the axial force N is equal to or greater than the pretension of the first cable. The overall spring constant of the first and second support members can be further reduced.

Similarly, a second elastic body is provided on at least one of the connection portion between the one end portion of the second cable and the second support member and the connection portion between the other end portion of the second cable and the first beam. Yes. Therefore, the one end portion of the second support member is held in a state in which the second elastic body is in contact with the second portion of the first beam by the deformation of the second elastic body according to the pretension of the second cable. When the axial force N described in the description of the invention according to item 5 is equal to or greater than the pretension of the second cable, the second support member is thereby separated from the first beam. As is apparent from the above, by appropriately setting the rigidity (spring constant) of the second elastic body, the second cable, the second elastic body, the second elastic body when the axial force N is equal to or greater than the pretension of the second cable. The overall spring constant of the first and second support members can be further reduced.

As described above, similarly to the invention according to claim 6 , the effect of the invention according to claim 5 , that is, the effect that it is possible to prevent excessive stress from being generated in the structure, the mass damper, the first and second support members, You can definitely get it.

From the above, as described in the description of the invention according to claim 7 , the axial force N (see FIG. 11) is reduced by the first cable 51 by appropriately setting the rigidity (spring constant) of the first disc spring 61. The overall spring constant of the first cable 51, the first disc spring 61, the first and second support members 2 and 3 when the tension is equal to or greater than the pretension can be further reduced, and the axial force N is smaller than that of the second cable. The overall spring constant of the second cable, the second disc spring, and the first and second support members 2 and 3 when the tension is equal to or greater than the pretension can be further reduced. Therefore, as in the second embodiment, the effect of preventing the generation of excessive stress on the structure S, the first and second support members 2 and 3, and the first and second mass dampers 4 and 5 is ensured. Can get to.

In order to achieve the above object, the invention according to claim 1 has a cross-beam-like frame structure in which a pair of pillars extending vertically in parallel with each other and a pair of upper and lower beams extending horizontally in parallel with each other are joined together. A vibration suppressing device for suppressing vibration of a structure, which is composed of a pillar material, one end of which is one of a pair of beams, a first beam that is one of a pair of beams, A first support member connected to a predetermined first part between the center between the pillars and extending obliquely from the first part toward the second beam which is the other of the pair of beams, and a pillar material; One end of the first beam is connected to a predetermined second part between the joint of the first beam with the other of the pair of pillars and the center between the pair of pillars, and is inclined from the second part toward the second beam. And the other end of the second support member connected to the other end of the first support member, A rotating mass having one end and one end connected to the second beam and the other end connected to the other ends of the first and second support members. And a mass damper that converts the relative displacement between the pair of beams transmitted through the support member into a rotational motion of the rotary mass, and one end portions of the first and second support members have the first and second ends. 1st which each contact | abutted without being fixed to a site | part, and was comprised with the steel wire, the pretension was provided, one end part was connected with the 1st support member, and the other end part was connected with the 1st beam. A cable and a second cable made of steel wire, pretensioned, one end connected to the second support member, and the other end connected to the first beam; A first pin is attached to at least one of the support member and the first beam, and the second support member Beauty in at least one of the first beam, a second pin is attached, the first and second cable is characterized by being wound around each of the first and second pins along the way.

In the present specification and claims, “joining” refers to connecting a plurality of members to each other by bolts or welding.
Further, according to the configuration described above, one end of the first support member is in contact with the first portion of the first beam without being fixed, and the one end and the other end of the first cable to which pretension is applied. The portions are connected to the first support member and the first beam, respectively. With this first cable, one end of the first support member is held in contact with the first part, that is, one end of the first support member is connected to the first part via the first cable. It is connected to. Similarly, one end portion of the second support member is in contact with the second portion of the first beam without being fixed, and one end portion and the other end portion of the second cable to which pre-tension is applied are supported by the second support member. The member and the first beam are connected to each other. With this second cable, one end of the second support member is held in contact with the second part, that is, one end of the second support member is connected to the second part via the second cable. It is connected to.
With the above configuration, the rigidity (spring constant) of the first and second support members and the first and second cables has a bilinear characteristic with respect to the reaction force of the mass damper. Hereinafter, this point will be described.
FIG. 11 shows the reaction force P of the mass damper when one end of the first and second support members is connected to the lower beam and both support members are arranged symmetrically with respect to the other end of each other. FIG. 5 shows an example of a relationship with the displacement (displacement input to the mass damper) x of the other end portions of the first and second support members to which the mass damper is connected. As shown in FIG. 11, in this example, the axial force N acting by the reaction force P of the mass damper is applied to the first support member in the direction opposite to the pretension of the first cable and to the second support member. Acts in the same direction as the pretension of the second cable. Further, (a) in the figure shows the case where the axial force N is smaller than the pretension of the first cable, and (b) shows the case where the axial force N is greater than the pretension of the first cable. ing.
First, the following equation (1) is established between the reaction force P of the mass damper and the axial force N from the balance condition. Here, θ is an angle formed by each of the first and second support members with the first beam.
N = P / 2 cos θ (1)
Further, when the lengths of the first and second support members are Lp, the Young's modulus of the first and second support members is Ep, and the cross-sectional areas of the first and second support members are Ap, respectively, the axial force N Is less than the pre-tension of the first cable (FIG. 11A), the displacement x is expressed by the following equation (2) from the above equation (1) and the virtual work method. As the displacement x occurs, the angle θ between the first support member and the first beam and the angle θ between the second support member and the first beam are strictly different from each other. Is very small, it is considered that they are the same in this equation (2).
x = {(P / 2 cos θ) (1/2 cos θ) Lp · 2} / (Ep · Ap)
= P · Lp / (2cos ² θ · Ep · Ap) (2)
From this equation (2), when the axial force N is smaller than the pretension of the first cable (FIG. 11A), the overall spring constant k1 of the first and second support members is expressed by the following equation (3 ).
k1 = P / x = 1 / {Lp / ( ² cos ² θ · Ep · Ap)} (3)
When the axial force N is equal to or greater than the pretension of the first cable (FIG. 11 (b)), the first support member is thereby separated from the first beam. From the work method, it is expressed by the following formula (4). Similar to the above formula (2), with the occurrence of the displacement x, the angle θ formed by the first support member with the first beam and the angle θ formed by the second support member with the first beam are strictly different from each other. However, since the difference between the two is very small, it is considered that they are the same in this equation (4).
x = {P · Lp / (2cos ² θ · Ep · Ap)}
+ {P · Lc / (4cos ² θ · Ec · Ac)} (4)
Here, Lc is the length of the first cable, Ec is the Young's modulus of the first cable, and Ac is the cross-sectional area of the first cable.
From this equation (4), when the axial force N is greater than or equal to the pretension of the first cable (FIG. 11 (b)), the overall spring constant k2 of the first cable and the first and second support members is It is represented by the following formula (5).
k2 = P / x = 1 / {[Lp / (2cos ² θ · Ep · Ap)]
+ [Lc / (4cos ² θ · Ec · Ac)]} (5)
As is clear from a comparison between these equations (3) and (5), the overall spring constants of the first cable, the first and second support members when the axial force N is equal to or greater than the pretension of the first cable. k2 is smaller than the overall spring constant k1 of the first and second support members when the axial force N is smaller than the pretension of the first cable. This is because the axial force N is applied to the second support member in the same direction as the pretension of the first cable with respect to the first support member by the reaction force P of the mass damper acting in the opposite direction to the case of FIG. The same applies to the case of acting in the opposite direction to the pretension of the second cable. That is, when the axial force N is equal to or greater than the pretension of the second cable, the overall spring constant k4 of the second cable and the first and second support members is when the axial force N is smaller than the pretension of the second cable. It becomes smaller than the whole spring constant k3 of the first and second support members.
From the above, as the relationship between the displacement x and the reaction force P of the mass damper, a bilinear relationship as shown in FIG. 12 can be obtained, and the rigidity of the first and second support members and the rigidity of the first and second cables are as follows. It has a bilinear characteristic with respect to the reaction force P of the mass damper. Accordingly, for example, when the natural frequency of the additional vibration system including the mass damper and the first and second support members is synchronized with the natural frequency of the structure to suppress the vibration of the structure, the displacement x increases. Accordingly, it is possible to obtain a smaller rigidity (= k2 or k4) before the reaction force P of the mass damper becomes excessive in synchronism with the vibration of the structure, and thereby the natural frequency of the additional vibration system. Can be made different from the natural frequency of the structure, the reaction force P of the mass damper can be suppressed. Therefore, it is possible to prevent excessive stress from being generated in the structure, the mass damper, and the first and second support members.
Further, according to the above-described configuration, the first cable is wound around the first pin provided on at least one of the first support member and the first beam in the middle, and the second cable is in the middle. Thus, it is wound around a second pin provided on at least one of the second support member and the first beam. As a result, by increasing the lengths of the first and second cables, the first cable and the first cable in the case where the axial force N is equal to or greater than the pretension of the first cable, as is apparent from the equation (5), And the overall spring constant k2 of the second support member and the overall spring constant k4 of the second cable and the first and second support members when the axial force N is equal to or greater than the pretension of the second cable. be able to.
Therefore, the above-described effect, that is, the effect that it is possible to prevent excessive stress from being generated in the structure, the mass damper, and the first and second support members can be reliably obtained. In addition, since the first and second cables are wound around the first and second pins, respectively, both can be arranged more compactly than in the case where the first and second cables are not wound.

The invention according to claim 2 is the vibration suppressing device according to claim 1, wherein the first portion is a position of ¼ of the length between the pair of columns from one column toward the other column. The second portion is set at a position of ¼ of the length between the pair of columns from the other column toward the one column side.

As described with reference to FIG. 10 in the description of the invention according to claim 1, when the structure is vibrated, when the pair of columns are bent and deformed to one side or the other side in the length direction of the beam, The beam bends and deforms in a sine wave shape. In this case, assuming that the length between the axes of the pair of columns is L, the portion of the pair of beams at a position approximately L / 4 from the axis of each of the pair of columns is The largest bending deformation is made upward or downward.

According to this configuration, the first portion, that is, the connecting portion of the first beam with the first support member has a length (L) of 1 between the pair of columns from one column toward the other column side. The position is set to / 4. In addition, the second portion, that is, the connecting portion of the first beam to the second support member, is located at a quarter of the length (L) between the pair of columns from the other column toward the one column side. Is set to As described above, when the structure vibrates, the displacement of the other end portions of the first and second support members using the bending deformation of the first beam can be maximized, so that the displacement transmitted to the mass damper is further increased. As a result, the vibration of the structure can be more appropriately suppressed.

According to a third aspect of the present invention, in the vibration suppressing device according to the first or second aspect, between the first beam and the second beam, the pair of columns extends horizontally in parallel with the first and second beams. A third beam joined to the first is provided.

The invention according to claim 4, in the vibration suppression apparatus according to claim 3, the third beam, are connected to each other, has a pair of beam members that faces the horizontal direction, the first and second support members Is characterized by penetrating vertically between a pair of beam members.

According to this configuration, the pair of beam members of the third beam are connected to each other and face in the horizontal direction, and the first and second support members pass through between the pair of beam members. As a result, when the structure vibrates, the first and second support members can be displaced without hindrance with respect to the third beam. Therefore, the displacement can be appropriately transmitted to the mass damper via both support members, and thus The effect according to claim 3 can be obtained appropriately.

The invention according to claim 5 is the vibration suppressing device according to claim 4 , wherein at least one of the first supporting member and the pair of beam members facing each other and the second supporting member and the pair of beam members facing each other. A surface material having slipperiness is affixed to at least one of the surfaces.

From the above , the first cable 51 and the first cable 51 when the axial force N (see FIG. 11) is equal to or greater than the pretension of the first cable 51 by appropriately setting the rigidity (spring constant) of the first disc spring 61. The total spring constant of the disc spring 61 and the first and second support members 2 and 3 can be further reduced, and the second cable and the second disc when the axial force N is equal to or greater than the pretension of the second cable. The spring constant of the spring and the first and second support members 2 and 3 can be further reduced. Therefore, as in the second embodiment, the effect of preventing the generation of excessive stress on the structure S, the first and second support members 2 and 3, and the first and second mass dampers 4 and 5 is ensured. Can get to.

Claims (8)

A vibration suppressing device for suppressing vibration of a structure having a cross-girder-like frame structure in which a pair of pillars extending vertically in parallel with each other and a pair of upper and lower beams extending horizontally in parallel with each other are joined,
The first beam is formed of a pillar material, and one end portion of the first beam, which is one of the pair of beams, is a predetermined first between a joint portion with one of the pair of columns and a center between the pair of columns. A first support member connected to the part and extending obliquely from the first part toward the second beam which is the other of the pair of beams;
The first beam is connected to a predetermined second portion between the joint of the first beam with the other of the pair of columns and the center between the pair of columns; A second support member extending obliquely from the two parts toward the second beam and having the other end connected to the other end of the first support member;
It has a rotatable mass, one end is connected to the second beam, the other end is connected to the other ends of the first and second support members, and the vibration of the structure A mass damper that converts a relative displacement between the pair of beams transmitted through the first and second support members into a rotational motion of the rotary mass;
A vibration suppressing device comprising: The first part is set at a position substantially ¼ of the length between the pair of columns from the one column toward the other column.
2. The second portion is set at a position substantially ¼ of the length between the pair of columns from the other column toward the one column. The vibration suppression device described in 1.   A third beam that extends horizontally in parallel with the first and second beams and is joined to the pair of columns is provided between the first beam and the second beam. The vibration suppressing device according to claim 1 or 2. The third beam is connected to each other and has a pair of beams facing each other in the horizontal direction,
4. The vibration suppressing device according to claim 3, wherein the first and second support members penetrate vertically between the pair of beam members. 5.   On at least one of the mutually opposing surfaces of the first support member and the pair of beam members and at least one of the mutually opposing surfaces of the second support member and the pair of beam members, a surface material having lubricity is provided. The vibration suppressing device according to claim 4, wherein the vibration suppressing device is attached. The one end portions of the first and second support members are in contact with the first and second portions without being fixed, respectively.
A first cable composed of a steel wire, pretensioned, one end connected to the first support member, and the other end connected to the first beam;
A second cable that is made of a steel wire, is pretensioned, has one end connected to the second support member, and the other end connected to the first beam. The vibration suppressing device according to any one of claims 1 to 5. A first pin is attached to at least one of the first support member and the first beam, and a second pin is attached to at least one of the second support member and the first beam,
The vibration suppressing device according to claim 6, wherein the first and second cables are respectively wound around the first and second pins in the middle thereof. At least one of the connecting portion between the one end portion of the first cable and the first support member and the connecting portion between the other end portion of the first cable and the first beam has a first elastic body. Provided,
At least one of the connecting portion between the one end of the second cable and the second support member and the connecting portion between the other end of the second cable and the first beam has a second elastic body. The vibration suppressing device according to claim 6, wherein the vibration suppressing device is provided.

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