JP6306416B2 - Structure damping device - Google Patents

Description

  The present invention relates to a structure damping device for suppressing vibration of a structure.

  The present applicant has already disclosed a structure damping device, for example, in Patent Document 1. This vibration damping device is mainly applied to a high-rise structure, and includes a support member made of a pillar material and a mass damper having a rotating mass. The support member extends in the up-down direction, and an upper end portion thereof is connected to an upper end portion of the structure, and a lower end portion is connected to a support body on which the structure is erected. The mass damper is connected to the support member in series. In this configuration, when a structure vibrates during an earthquake or the like, and its upper end repeatedly reciprocates in the left-right direction (oscillates), the displacement is transmitted to the mass damper via the support member and converted into rotation of the rotating mass. By doing so, the vibration of the structure is suppressed.

  Further, in this vibration damping device, as the structure swings, a tensile load and a compressive load act alternately on the support member formed of the column material, and the support member may buckle when the compressive load is applied. Therefore, a buckling prevention mechanism for preventing this is provided. This buckling prevention mechanism is, for example, a plurality of concrete slabs provided in a plurality of locations in the vertical direction of the structure so as to extend horizontally along the outer periphery thereof, and restraint holes formed in each slab. The support member is passed through the constraining holes of the plurality of slabs. With this structure, when the support member bends slightly to the side due to the compression load acting as the structure swings, the support member comes into contact with the edge of the restraint hole, and the displacement is restrained. Thus, buckling of the support member is prevented.

Japanese Patent No. 5149453

  As described above, the conventional vibration damping device is composed of a pillar material, and is composed of a plurality of slabs or the like in order to prevent buckling of the support member that extends long between the upper end of the structure and the support. A plurality of buckling prevention mechanisms must be provided, which increases the cost and weight of the device. In order to prevent buckling of the support member, it is conceivable to increase the cross section of the support member, for example, instead of providing the buckling prevention mechanism as described above. However, in that case, if the support member is lengthened, the cross section may be excessively increased accordingly, resulting in problems such as an increase in the weight of the apparatus.

  The present invention has been made to solve the above-described problems. With a simple configuration, the buckling of the support member that transmits the displacement of the structure to the mass damper can be reliably eliminated, and the vibration of the structure can be eliminated. An object of the present invention is to provide a vibration control device for a structure that can appropriately suppress the vibration.

  In order to achieve the above object, the invention according to claim 1 is a pair of pillars spaced apart from each other, and joined to the pair of pillars, respectively, and sequentially arranged at intervals in the vertical direction. A structure damping device for suppressing vibration of a structure having a first beam, a second beam, and a third beam, one end of which is connected to a joint between the first beam and a pair of columns, respectively A pair of cables extending obliquely so as to approach each other toward the third beam, and a pillar material, one end of which is connected to the second beam and extending toward the third beam, The compression member having the other end connected thereto and a rotatable rotating mass, connected to the compression member and the third beam, and transmitted through the pair of cables and the compression member in accordance with the vibration of the structure. Massdan that converts the relative displacement between the first beam and the third beam into the rotational motion of the rotating mass Characterized in that it comprises a and.

  Hereinafter, the configuration and operation of the above-described structure damping device according to the present invention will be described with reference to FIG. As shown in the figure, the structure has a pair of columns and first to third beams joined to the pair of columns, and the first to third beams are arranged in this order in the vertical direction. ing. Each end of the pair of cables is connected to the joint between the first beam and the pair of columns. The pair of cables extend obliquely so as to approach each other toward the third beam, and each other end is connected to the compression material. The compression material is formed of a pillar material, is connected to the second beam, and extends toward the third beam. Further, the mass damper having the rotating mass is connected to the compression material and the third beam.

  In the vibration damping device having the above configuration, the structure vibrates from the normal state (the two-dot chain line in FIGS. 3A and 3B), for example, swings to the right as shown by the solid line in FIG. When moved, a relative displacement (hereinafter referred to as “interlayer displacement”) ΔA occurs between the first beam and the third beam. As the interlayer displacement ΔA occurs, the right cable connected to the joint between the first beam and the right column of the pair of cables is pulled upward, so that a tensile load Ft acts on the cable. To do. When the tensile load Ft acts on the compressed material as a compressive load and a bending load, the compressed material is bent and deformed to the mass damper side, and the displacement (hereinafter referred to as “input displacement”) ΔB of the distal end portion of the compressed material is input to the mass damper. As a result, the rotating mass of the mass damper rotates. On the other hand, when the structure swings to the right as described above, a load Fc in the compression direction, that is, a load in the direction of loosening the cable acts on the left cable. Is not involved in the transmission of the interlayer displacement ΔA.

  As described above, when the structure swings to the right, the interlayer displacement ΔA is transmitted to the mass damper via the right cable and the compression material, and is input to the mass damper as the input displacement ΔB. As a result, when the rotating mass of the mass damper rotates, the additional vibration system including the mass damper, the right cable, and the compression material vibrates. On the other hand, although not shown, when the structure swings to the left in FIG. 3, the movement of the pair of cables and the compression material is reversed left and right, so that the interlayer displacement ΔA Then, the additional vibration system composed of the mass damper, the left cable, and the compression material vibrates. Therefore, the vibration of the structure is suppressed by absorbing the vibration energy of the structure by the additional vibration system by tuning (resonating) the natural frequency of these additional vibration systems to the natural frequency of the structure. .

  In addition, as described above, with the vibration of the structure, regardless of the swinging direction, the pair of cables function as a tensile material that supports the tensile load Ft, and the load Fc in the compression direction is the same as that of the second beam. It is supported by the compression material comprised by the comparatively short pillar material extended between 3rd beams. Therefore, unlike the conventional case, the buckling of the support member for transmitting the interlayer displacement ΔA to the mass damper can be reliably eliminated with a simple configuration without providing a special buckling prevention mechanism.

  Furthermore, since the reaction force torque from the mass damper is supported by the compression material composed of the column material and does not act on the cable, it is possible to easily and reliably prevent the cable from being twisted by the reaction force torque.

  Note that FIG. 3 is intended to facilitate understanding of the configuration and operation of the present invention, and the present invention is not limited to this, and various changes and modifications as described later are possible. In the specification and claims of the present application, “joining” means that a plurality of members are rigidly connected to each other by bolts, welding, or the like.

  The invention according to claim 2 is the vibration damping device for the structure according to claim 1, wherein at least one intermediate beam joined to the pair of columns is disposed between the first beam and the second beam, The second beam and the third beam are arranged so as to be adjacent to each other.

  When the structure vibrates, the interlayer displacement ΔA between the first beam and the third beam becomes larger as the distance between the two beams increases. According to this configuration, at least one intermediate beam is provided between the first beam and the second beam, and accordingly, the distance between the first beam and the third beam is further ensured. Thereby, the vibration of the structure can be more appropriately suppressed by increasing the interlayer displacement ΔA and increasing the input displacement ΔB to the mass damper accordingly.

  Further, the second beam and the third beam are arranged adjacent to each other, that is, there is no intermediate beam between the two beams. Thereby, since the compression material extended between both beams is hold | maintained at short length, the buckling of a compression material can be prevented reliably.

  According to a third aspect of the present invention, in the vibration damping device for a structure according to the first or second aspect, the third beam is provided on the third beam, engages with the compression material, and guides the compression material in the length direction of the third beam. And a guide member.

  As described above, as the structure oscillates, the compression material reciprocates so as to be in contact with and away from the mass damper, and at that time, receives a reaction torque from the mass damper. According to this configuration, the compression member that reciprocates in a state in which the reaction torque is applied can be smoothly guided by the guide member in the length direction of the third beam, that is, in the direction of being separated from or contacting the mass damper. It is possible to satisfactorily transmit the interlayer displacement ΔA to the mass damper.

  According to a fourth aspect of the present invention, in the vibration damping device for a structure according to any one of the first to third aspects, a predetermined pretension is applied to the pair of cables.

  According to this configuration, for example, as shown in FIG. 3, when a load Fc in the compression direction acts on the left cable when the structure swings to the right, the pretension applied to the cable is Until offset by the load Fc in the compression direction, the left cable vibrates together with the additional vibration system and functions as a part of the additional vibration system.

  Therefore, as the overall rigidity of the support member made up of the additional vibration system cable and the compression material, including the rigidity of both the left and right cables until the pretension is canceled, and after the pretension is canceled Bilinear characteristics consisting of less stiffness, including the stiffness of only the right cable, are obtained. Therefore, using the bilinear rigidity of such a support member, for example, the natural frequency of the additional vibration system can be set differently when the input displacement ΔB to the mass damper is small and large. become.

  Moreover, the advantage that a long-term load (fixed load such as slab or load) acting on the second beam provided with the compression material can be canceled by applying pretension to the cable is also obtained.

  The invention according to claim 5 is the vibration damping device for a structure according to any one of claims 1 to 4, wherein the pair of cables have different rigidity.

  According to this configuration, since the rigidity of the pair of cables is different from each other, the natural frequency of the additional vibration system including one cable and the natural frequency of the additional vibration system including the other cable can be set to be different from each other. . In this case, for example, the natural frequency of one additional vibration system is tuned to one (for example, primary mode) natural frequency of the structure, and the natural frequency of the other additional vibration system is adjusted to the other one of the structure. Multiple tuning may be performed to tune to two (eg, second order mode) natural frequencies. Alternatively, the average value of the different natural frequencies of the two additional vibration systems may be tuned to one (for example, primary mode) natural frequency of the structure.

  The invention according to claim 6 is the vibration damping device for a structure according to any one of claims 1 to 4, wherein the compression material is disposed at a position shifted from the center in the length direction of the second beam, The cables are characterized by extending at different angles with respect to the compression material.

  When the installation angle of the pair of cables with respect to the compression material is different as in this configuration, the tensile load Ft (axial force) acting on the cable is different with respect to the same amount of interlayer displacement ΔA. The apparent rigidity varies between the two. Therefore, also in this configuration, as in the case of claim 5, the natural frequency of the additional vibration system including one cable and the natural frequency of the additional vibration system including the other cable can be set to be different from each other, An effect similar to that of the fifth aspect can be obtained.

  The invention according to claim 7 is the vibration damping device for a structure according to any one of claims 1 to 6, wherein the pair of first pulleys are respectively attached to the joint portion between the first beam and the pair of column members. And a pair of second pulleys attached to a predetermined portion of the second beam, and each of the pair of cables is wound around the first pulley and the second pulley.

  According to this structure, since each of a pair of cables is wound around the 1st and 2nd pulley in the middle, one of both pulleys functions as a moving pulley with respect to the other. By this dynamic pulley function, the interlayer displacement ΔA is transmitted to the compression material in an amplified state compared to the number of cable turns by the first and second pulleys. As a result, since the input displacement ΔB to the mass damper increases, the vibration damping effect of the structure can be further enhanced.

It is a front view which shows the damping device by 1st Embodiment of this invention with a part of structure. It is sectional drawing which follows the XX line of FIG. It is a figure which shows typically the structure and operation | movement of the damping device by this invention about the time of (a) the non-vibration of a structure, and the (b) vibration of a structure. It is sectional drawing of a mass damper. It is a figure which shows the relationship between the input displacement of a supporting member at the time of giving a pretension to a cable, and the reaction force (= reaction force of a mass damper) of a supporting member. It is a figure which shows the example of installation of the damping device to a structure. It is a figure which shows the damping device by the modification of 1st Embodiment. It is a figure which shows the vibration damping device by the other modification of 1st Embodiment. It is a figure which shows three damping devices by 2nd Embodiment of this invention. It is a figure which shows the other three damping devices by 2nd Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1 to 6 show a vibration damping device according to the first embodiment. As shown in FIG. 1, the structures S are arranged at intervals in the left-right direction, and are arranged at a regular interval with a pair of left and right columns P (left column PL, right column PR) extending vertically. It is a high-rise building having a cross-beam shaped ramen structure in which five beams B extending horizontally are joined to each other, and is erected on the ground (not shown).

  Each of the pair of pillars P and the five beams B is made of H-section steel. You may comprise these members with a square steel pipe. A slab SL made of concrete or the like is laid on the upper side of each beam B. Hereinafter, the five beams B are referred to as a first beam B1, a first intermediate beam BM1, a second intermediate beam BM2, a second beam B2, and a third beam B3 in order from the top.

  As shown in FIG. 1, the vibration damping device according to the embodiment includes a pair of left and right cables 2 (left cable 2L, right cable 2R), a compression material 3, a mass damper 4, and the like.

  The left and right cables 2L, 2R are composed of steel wires having the same cross-sectional area, and are arranged symmetrically with each other and composed of two sets of front and rear as shown in FIGS. . Each left cable 2L has an upper end connected to a joint between the first beam B1 and the left column PL via an attachment member (not shown), and extends obliquely downward to the vicinity of the center of the third beam B3. The lower end portion is connected to the compression material 3.

  Similarly, each right cable 2R has an upper end connected to the joint between the first beam B1 and the right column PR via an attachment member (not shown), and obliquely downward to the vicinity of the center of the third beam B3. While extending, it is connected to the compression material 3 at the lower end.

  A cable through hole 2a penetrating in the vertical direction is formed at a predetermined position of each slab SL on the upper side of the first and second intermediate beams BM1, BM2 and the second beam B2. Each cable 2 is passed through the corresponding cable through hole 2a and extends in the vertical direction through the front side or the back side of the first and second intermediate beams BM1, BM2 and the second beam B2.

  The compression member 3 is composed of a relatively short column member made of H-shaped steel, and is arranged at the center in the length direction of the second beam B2, and its upper end is connected to the lower flange of the second beam B2. Has been. The compression material 3 extends vertically from the second beam B2 to the vicinity of the third beam B3, the two flanges 3a and 3a face each other in the left-right direction, and the web 3b is parallel to the second beam B2. Are arranged as follows.

  A plurality of cable connecting portions 5 are integrally provided on the compression material 3. These cable connecting portions 5 are made of, for example, steel, and are attached to the front ends and the rear ends of the flanges 3a and 3a of the compression material 3 by means of two attachment plates 5a. Further, a male screw (not shown) is formed at the lower end of each cable 2, and each cable 2 is connected to the cable connecting portion 5 by a nut (not shown) screwed to the male screw.

  A pair of front and rear guide members 6 and 6 are provided on the upper surface of the slab SL on the third beam B3 at the center in the length direction of the third beam B3. These guide members 6, 6 are made of, for example, steel and have a triangular protrusion in the side cross section, and the lower end portion of the web 3 b of the compression material 3 is engaged therebetween. With this configuration, the compressed material 3 is guided by the guide members 6 and 6 when moving in the left-right direction. Note that a sliding surface plate (not shown) made of fluororesin or the like may be attached to at least one of the guide members 6 and 6 and the web 3b that are engaged with each other. , 6 can be guided more smoothly.

  The mass damper 4 is disposed between the compression material 3 and the third beam B3 and is connected to both. Since the mass damper 4 is configured in the same manner as that disclosed in Japanese Patent Application No. 2012-158921 proposed by the inventor of the present invention, its configuration and operation will be briefly described below. As shown in FIG. 4, the mass damper 4 includes an inner cylinder 21, a ball screw 22, a 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 having a friction that does not move with the torque generated by the mass damper 4.

  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 portion of the screw shaft 22a is accommodated in the opening of the inner cylinder 21 described above, and the other end portion of the screw shaft 22a is passed through a universal joint having a friction that does not move with the torque generated by the mass damper 4. The second flange 26 is attached. The nut 22 c is rotatably supported by the inner cylinder 21 via a bearing 27.

  The rotary mass 23 is made of a material having a large specific gravity, for example, iron, and is formed in a cylindrical shape. The 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 rotary 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 and 29, the rotary mass 23, and the inner cylinder 21 is filled with a viscous body 30 made of silicon oil.

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

  The restriction mechanism 24 restricts the rotational conversion operation of the 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 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 rotary mass 23 where the rotary 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, so that the rotary mass 23 is integrally connected to the nut 22c via the rotary sliding member 24a. It will be in the state.

  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 mass damper 4 (hereinafter referred to as "axial load") is determined by the tightening degree of the screw 24b. Until the rotation mass 23 is reached, the rotary mass 23 rotates integrally with the nut 22c. On the other hand, when the axial load of the mass damper 4 reaches the limit load, the rotation conversion operation of the mass damper 4 is limited by the occurrence of slippage between the rotating sliding material 24a and the nut 22c or the rotating mass 23. In this state, the rotational inertia force of the rotating mass 23 reduced by the limitation of the rotation conversion operation of the mass damper 4 is compensated by the frictional resistance generated between the rotating sliding material 24 a and the nut 22 c or the rotating mass 23.

  The first flange 25 of the mass damper 4 is attached to a fixture 7 provided integrally at the right end of the third beam B3, whereby the mass damper 4 is connected to the third beam B3. Further, the second flange 26 is attached to the right flange 3 a of the compression material 3, whereby the mass damper 4 is coupled to the compression material 3. The mass damper 4 is only allowed to rotate with respect to the fixture 7 and the compression member 3 about the axis extending in the front-rear direction by the universal joints of the first and second flanges 25 and 26.

  According to the vibration damping device of the first embodiment having the above configuration, as described with reference to FIG. 3, when the structure S swings to one of the left and right sides in FIG. When the tensile load Ft acts on the cable 2 (hereinafter referred to as “tension side cable 2”), the interlayer displacement ΔA between the first beam B1 and the third beam B3 causes the tension side cable 2 and the compression material 3 to move. Through the mass damper 4 and input as an input displacement ΔB. Thereby, when the rotary mass 23 of the mass damper 4 rotates, the additional vibration system composed of the mass damper 4, the tension side cable 2, and the compression material 3 vibrates.

  On the other hand, since the load Fc in the compression direction acts on the cable 2 opposite to the tension side cable 2 (hereinafter referred to as “compression side cable 2”), the compression side cable 2 does not participate in the transmission of the interlayer displacement ΔA. . Therefore, by tuning (resonating) the natural frequency of the additional vibration system composed of the mass damper 4, the tension side cable 2 and the compression material 3 to the natural frequency of the structure S, the vibration energy of the structure S is adjusted in the additional vibration system. By absorbing, the vibration of the structure S can be suppressed appropriately.

  For example, in this embodiment, the left and right cables 2L and 2R have the same rigidity (spring constant), and the rigidity of the cable 2 and the compression material 3 and the mass of the rotary mass 23 are the natural frequencies of the additional vibration system. It is set so as to tune to the primary natural frequency of the structure S (the natural frequency when the vibration mode of the structure S is the primary mode), so that the vibration of the primary mode of the structure S is appropriately It is suppressed.

  Further, along with the vibration of the structure S, regardless of the swing direction, one of the left and right cables 2L, 2R functions as the tension side cable 2 that supports the tensile load Ft, and the load Fc in the compression direction is Supported by the compression material 3. Therefore, unlike the conventional case, the buckling of the support member for transmitting the interlayer displacement ΔA to the mass damper 4 can be reliably eliminated with a simple configuration without providing a special buckling prevention mechanism.

  Furthermore, since the reaction force torque from the mass damper 4 is supported by the compression material 3 made of a pillar material and does not act on the cable 2, it is possible to easily and reliably prevent the cable 2 from being twisted by the reaction force torque. .

  In addition, since the first beam B1 and the second beam B2 are arranged on both upper and lower sides of the first and second intermediate beams BM1 and BM2, a sufficient distance between the first beam B1 and the third beam B3 is secured. Therefore, the interlayer displacement ΔA between the beams B1 and B3 can be increased, and the input displacement ΔB to the mass damper 4 can be increased accordingly. Therefore, the vibration of the structure S can be more appropriately suppressed. it can. In addition, since the second beam B2 and the third beam B3 are arranged so as to be adjacent to each other, the compression material 3 extending between the beams B2 and B3 is held in a short length, so that the seat of the compression material 3 Bending can be reliably prevented.

  Further, the compression member 3 that reciprocates in a state of receiving the reaction torque from the mass damper 4 can be smoothly guided in the length direction of the third beam by the guide members 6, 6. Therefore, the interlayer displacement ΔA to the mass damper 4 can be reduced. Good transmission can be performed.

  A predetermined pretension may be applied to the pair of cables 2 and 2. Such pretension can be easily applied by increasing and adjusting the above-described nut tightening force for attaching the cable 2 to the cable connecting portion 5.

  In this state where the pretension is applied, the compression-side cable 2 vibrates together with the additional vibration system until the pretension is canceled by the load Fc in the compression direction, and functions as a part of the additional vibration system. To do. As a result, as shown in FIG. 5, the overall rigidity k (spring constant = reaction force P of the support member / input displacement δ of the support member) of the support member composed of the additional vibration system cable 2 and the compression material 3 It consists of a larger rigidity k1 including the rigidity of both the left and right cables 2 and 2 until the tension is canceled, and a smaller rigidity k2 including the rigidity of only one cable 2 after the pretension is canceled. Bilinear characteristics can be obtained.

  By utilizing such bilinear rigidity, for example, the rigidity of the support member can be switched to a smaller rigidity before the reaction force P of the mass damper 4 becomes excessive as the input displacement ΔB increases. As a result, the natural frequency of the additional vibration system does not coincide with the primary natural frequency of the structure S, so that the reaction force P of the mass damper 4 can be suppressed. As a result, the structure S, the cable 2 and the mass damper 4 are excessive. Generation of stress can be prevented.

  Further, by applying a pretension to the cable 2, it is possible to obtain an advantage that a long-term load (fixed load such as slab SL or a loaded load) acting on the second beam B2 provided with the compression material 3 can be canceled. .

  FIG. 6 shows an installation example of the vibration damping device including the cables 2 and 2, the compression material 3, the mass damper 4, and the like described above on the structure S. The figure (a) arrange | positions several damping devices for every four layers of the structure S, the 3rd beam in which the mass damper 4 of the upper damping device was provided, and the lower damping device The first beam is shared. (B) in FIG. 4 is a configuration in which a plurality of vibration control devices are arranged while being shifted for each layer of the structure S. Since the number of vibration control devices is larger than in the case of (a), the vibration control performance is improved. Can be increased.

  6 (c) shows the arrangement of the components of the vibration damping device upside down in the case of (a) and (b), that is, the compression material 3 and the mass damper 4 are on the upper side, and the cable 2 is on the lower side. It is arranged in. Since the number of damping devices installed is the same as in (b), the damping performance equivalent to (b) can be obtained.

  In addition, when a plurality of vibration control devices are installed in the structure S as described above, additional vibrations are obtained by changing the rigidity of the cable 2 and the compression material 3 and the mass of the rotating mass 23 between the plurality of vibration control devices. The natural frequencies of the system may be set to be different from each other. For example, the structure S may be set so as to be tuned to the natural frequency of the first-order to n-th mode (n = 2, 3,...). It can suppress more favorably.

  Next, a modification of the first embodiment will be described with reference to FIG. In this modification, the rigidity of the pair of cables 2 and 2 is set to be different from each other. Specifically, the left cable 2L in FIG. 7 has lower rigidity due to a small cross-sectional area, and the right cable 2R has higher rigidity due to a large cross-sectional area.

  Therefore, according to this modification, from the difference in rigidity between the left and right cables 2L, 2R, the natural frequency of the additional vibration system including the left cable 2L and the natural frequency of the additional vibration system including the right cable 2R are: Can be set differently. In this case, for example, the natural frequency of the additional vibration system including the left cable 2L with low rigidity is tuned to the natural frequency of the primary mode of the structure, and the natural frequency of the other additional vibration system including the right cable 2R with high rigidity is obtained. Multiple tuning may be used to tune the frequency to the natural frequency of the secondary mode of the structure.

  Thereby, multiple tuning can be performed by one damping device. Alternatively, the average value of the different natural frequencies of the two additional vibration systems may be tuned to one (for example, primary mode) natural frequency of the structure S.

  FIG. 8 shows another modification of the first embodiment. In this modification, the compression material 3 is disposed at a position shifted to the right side from the center in the length direction of the second beam B2, and thereby the angle of the right cable 2R with respect to a vertical line passing through the center of the compression material 3 θR is smaller than the angle θL of the left cable 2L.

  For this reason, since the tensile load Ft (axial force) acting on the right cable 2R becomes larger than the reaction force of the mass damper 4 having the same size, the apparent rigidity of the right cable 2R is lowered. Therefore, also in this modification, the natural frequency of the additional vibration system including the left cable 2L and the natural frequency of the additional vibration system including the right cable 2R can be set to be different from each other. The same effect as in the case of can be obtained.

  Next, a vibration damping device according to a second embodiment of the present invention will be described with reference to FIGS. 9 and 10. In the second embodiment, a first pulley 8 and a second pulley 9 are added to the vibration damping device of the first embodiment. As shown in both figures, the first pulley 8 and the second pulley 9 are both configured as a pair of left and right, and in the example of FIGS. 9A to 9C, the first pulley 8 is the first beam. The second pulley 9 is provided at a position corresponding to the left and right cables 2L and 2R on the upper surface of the second beam B2, respectively, provided at the junction between B1 and the left column PL and right column PR.

  For the first and second pulleys 8 and 9, the left and right cables 2L and 2R are provided as follows. For example, one end of the right cable 2R is connected to the joint between the first beam B1 and the right column PR, and then passes through the cable passage hole 2a (not shown in FIG. 9) of the intermediate slab SL. After being wound obliquely downward and wound around the second pulley 9, it extends obliquely upward and after being wound around the first pulley 8, it again extends obliquely downward and the cable of the compression material 3 at the other end. It is connected to a connecting part 5 (not shown in FIG. 9). The left cable 2L is also wound around the first and second pulleys 8 and 9 in the same manner.

  As described above, since each of the left and right cables 2L and 2R is wound around the first and second pulleys 8 and 9 in the middle thereof, one of the pulleys 8 and 9 is a moving pulley with respect to the other. Function. By this dynamic pulley function, the interlayer displacement ΔA is transmitted to the compression material 3 in a state where it is amplified according to the number of turns of the cable 2 by the first and second pulleys 8 and 9. As a result, since the input displacement ΔB to the mass damper 4 increases, the damping effect of the structure S can be further enhanced.

  The example shown in FIG. 9B is provided with a pair of reinforcing pillars 10 and 10 for the example of FIG. Each stud 10 has a lower end connected to the vicinity of the second pulley 9 of the second beam B2, extends vertically upward, and is connected to the second intermediate beam BM2 at the upper end. According to this configuration, the vertical displacement of the second beam B2 to which the compression material 3 and the second pulley 9 are attached is prevented by the inter-column 10, so that the above-described amplification effect of the interlayer displacement ΔA by the dynamic pulley function can be obtained. It can be obtained stably.

  In the example shown in FIG. 9C, a pair of braces 11 and 11 for reinforcement are provided in place of the intermediate pillar 10 described above. Each brace 11 has an upper end connected to the vicinity of the second pulley 9 of the second beam B2, extends obliquely downward, and is connected to a joint between the third beam B3 and the left column PL or the right column PR at the lower end. Has been. Also in this configuration, since the vertical displacement of the second beam B2 is prevented by the brace 11, the amplification effect of the interlayer displacement ΔA by the dynamic pulley function can be stably obtained.

  The example shown in FIG. 10 differs from the example of FIG. 9 in that the arrangement and number of the second pulleys 9 are different, and the left and right cables 2L, 2R are arranged in a crossed manner. As in the case of FIG. 9, one first pulley 8 is provided at each joint between the first beam B <b> 1 and the left column PL and right column PR. On the other hand, two second pulleys 9 are provided at the front and rear at the joint between the second beam B2, the left column PL, and the right column PR (only one is shown).

  For these first and second pulleys 8 and 9, the cables 2L and 2R are provided in a cross-hatch shape. For example, the right cable 2R extends obliquely downward from the joint between the first beam B1 and the right column PR, is wound around one of the left and right second pulleys 9 and 9, and then extends obliquely upward. After being wound around the first pulley 8 on the right side, the cable connecting portion 5 on the left side of the compression material 3 at the other end after extending obliquely downward again and wound around the other of the second pulleys 9 and 9 on the left side. (Not shown in FIG. 10). The left cable 2L is also wound around the first and second pulleys 8 and 9 in the same manner.

  According to the above configuration, as in the case of FIG. 9, the interlayer displacement ΔA is transmitted to the compression material 3 in an amplified state by the dynamic pulley function of the first and second pulleys 8 and 9. Compared with the case of FIG. 9, since the number of turns of the cable 2 by the first and second pulleys 8 and 9 is large, a higher amplification function of the interlayer displacement ΔA can be obtained, and the other end of the cable 2 is Since the input displacement ΔB to the mass damper 4 is increased by being connected to the compressed material 3 at an angle closer to the horizontal, the vibration damping effect of the structure S can be further enhanced.

  Further, in the example shown in FIG. 10B, a single pillar 10 is provided between the vicinity of the compression material 3 of the second beam B2 and the second intermediate beam BM2. Further, in the example shown in FIG. 10C, braces 11 are provided in the vicinity of the compression material 3 of the second beam B2 and between the joint portions of the third beam B3, the left column PL, and the right column PR, respectively. Is. According to the above configuration, the vertical displacement of the second beam B2 to which the compression material 3 is attached is prevented by the stud 10 or the brace 11 as in the case of FIGS. 9B and 9C described above. Thus, the amplification effect of the interlayer displacement ΔA due to the above-described moving pulley function can be stably obtained.

  In addition, this invention can be implemented in various aspects, without being limited to embodiment and the modification which were demonstrated. For example, in the embodiment, one mass damper 4 is arranged on the right side of the compression material 3 in one vibration damping device, but the number of mass dampers may be plural, for example, the mass dampers 4 are arranged on both the left and right sides of the compression material 3, respectively. You may arrange. Further, the mass damper 4 may be driven by fluid as disclosed in Japanese Patent Application Laid-Open No. 2014-052066. Furthermore, the number of the first pulleys 8 and 9 is also arbitrary, and a higher amplification effect of the interlayer displacement ΔA can be obtained as the number of turns of the cable 2 by the two pulleys 8 and 9 increases.

  Furthermore, in the embodiment, the guide member 6 that guides the compression material 3 has a projection shape, but is not limited thereto, and may be a rail shape extending in the left-right direction, and the compression material 3 and the second beam B2 These joints may be pin joints.

  In the embodiment, the number of intermediate beams in the present invention is two in total, that is, the first and second intermediate beams BM1 and BM2, but may be one or three or more. Alternatively, it is possible to omit the intermediate beam, that is, to apply the present invention by using three beams of the structure S adjacent in order as the first beam to the third beam.

  Further, the embodiment is an example in which the vibration damping device of 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 can be applied 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 P column PL left column PR right column B beam B1 first beam B2 second beam B3 third beam BM1 first intermediate beam (intermediate beam)
BM2 Second intermediate beam (intermediate beam)
ΔA Interlayer displacement (relative displacement between the first and third beams)
2 cable 2L left cable 2R right cable 3 compression material 4 mass damper 6 guide member 8 first pulley 9 second pulley 23 rotating mass

Claims (7)

A structure having a pair of columns arranged at a distance from each other, and a first beam, a second beam, and a third beam respectively joined to the pair of columns and arranged in order in the vertical direction at intervals from each other A structure damping device for suppressing vibrations of
A pair of cables each having one end connected to a joint between the first beam and the pair of columns and extending obliquely so as to approach each other toward the third beam;
A compression material composed of a pillar material, connected to the second beam, extending toward the third beam, and connected to the other ends of the pair of cables;
The first beam and the third beam, which have a rotatable rotating mass, are connected to the compression material and the third beam, and are transmitted through the pair of cables and the compression material in accordance with the vibration of the structure. A mass damper that converts the relative displacement between the three beams into the rotational motion of the rotating mass;
A structure damping device comprising:   At least one intermediate beam joined to the pair of columns is disposed between the first beam and the second beam, and the second beam and the third beam are disposed adjacent to each other. The vibration damping device for a structure according to claim 1, wherein:   The guide member according to claim 1, further comprising a guide member that is provided on the third beam, engages with the compression material, and guides the compression material in a length direction of the third beam. Structure damping device.   The structure damping device according to any one of claims 1 to 3, wherein a predetermined pre-tension is applied to the pair of cables.   The structure damping device according to any one of claims 1 to 4, wherein the pair of cables have different rigidity.   The compressed material is disposed at a position shifted from a center in a length direction of the second beam, and the pair of cables extend at different angles with respect to the compressed material. A structure damping device according to any one of 1 to 4. A pair of first pulleys each attached to a joint between the first beam and the pair of pillar members;
A pair of second pulleys attached to predetermined portions of the second beam; and
The structure damping device according to any one of claims 1 to 6, wherein each of the pair of cables is wound around the first pulley and the second pulley.

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