JP2014122514A - Vibration control device for structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device for structure such that the length of a cable can be suitably set and vibration control effect by the whole device including a second mass damper can be suitably obtained.SOLUTION: One end part of a support member 2 is connected to a support F supporting a structure B, and a first mass damper 3 which converts input displacement into rotary motion of a first rotary mass is connected to an upper end of the structure B and the other end of the support member 2. Further, a first pulley 8 is connected to an upper end of the structure B, and a second pulley 9 is fitted to the other end of the support member 2. Further, a cable 5 has its one end connected to the other end of the support member 2 and is also wound around the first and second pulleys 8, 9, and a second mass damper 4 which converts the input displacement into rotary motion of a second rotary mass is connected to the upper end of the structure B and the other end of the cable 5.

Description

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

  Conventionally, as this type of vibration damping device, for example, one disclosed in Non-Patent Document 1 is known. The vibration damping device is applied to a high-rise building, and includes a damper and a plurality of first pulleys mounted on the roof of the building, a plurality of second pulleys fixed to the ground, A cable wound around the second pulley is provided. One end of the cable is attached to the ground, and the other end is attached to the damper.

  In the conventional vibration damping device having the above configuration, when the building vibrates due to an earthquake or the like, the displacement of the building due to the vibration is transmitted to the damper via the cable, and thereby the vibration energy of the building is absorbed by the damper. . In this case, the first pulley mounted on the roof of the building functions as a moving pulley, so that the displacement transmitted to the damper via the cable is doubled by the number of turns of the cable, thereby Absorption of vibration energy increases. Further, Non-Patent Document 1 discloses replacing a part of the cable with a steel material or the like in order to reduce the elongation of the cable.

Summary of Academic Lectures of the Architectural Institute of Japan (published September 2012) pp. 949-950)

  However, when a part of the cable is replaced with steel as described above, for example, the lower end of the steel that extends in the vertical direction is fixed to the ground, and the second pulley and one end of the cable are attached to the upper end of the steel. In the case of failure, there are the following problems. That is, since the steel material has higher rigidity than the cable, when the structure is displaced by vibration, the displacement of the building relative to the steel material is transmitted to the damper via the cable. In this case, since the steel material extends upward from the ground, the vertical displacement of the building relative to the steel is smaller than the vertical displacement of the building relative to the ground by the amount of elongation of the steel material.

  For this reason, in order to sufficiently obtain the amount of vibration energy absorbed by the damper, the number of first and second pulleys is increased, thereby increasing the displacement increasing effect by the moving pulley, thereby reducing the displacement transmitted to the damper. It can be increased. However, in that case, the cable becomes longer and its rigidity decreases, so that the vibration energy of the building is not properly transmitted to the damper via the cable, and thus the vibration damping effect by the damper can be obtained appropriately. Will not be able to.

  The present invention has been made to solve the above-described problems, and can appropriately set the length of the cable, thereby appropriately obtaining the vibration damping effect by the entire apparatus including the second mass damper. An object of the present invention is to provide a vibration damping device for a structure that can be used.

  In order to achieve the above object, the invention according to claim 1 is a structure damping device for suppressing vibration of a structure supported by a support, and has a column member extending in the vertical direction. And a support member having one end connected to one of the upper end of the structure and the support, a rotatable first rotating mass, the other of the upper end of the structure and the support, and the other support member. A first mass damper that is coupled to the end portion and converts the displacement of the structure transmitted through the support member into a rotational motion of the first rotating mass when the structure vibrates; and an upper end portion of the structure And a first pulley connected to the other end of the support, a second pulley attached to the other end of the support member, one end connected to the other end of the support member, and the first and second pulleys A cable wound around and a rotatable second rotating mass, and the upper end and support of the structure. The structure is connected to the other end of the body and the other end of the cable, and when the structure vibrates, the displacement of the structure transmitted through the support member and the cable is converted into the rotational motion of the second rotating mass. And a second mass damper.

  According to this configuration, one end of the support member made of a pillar material or the like is connected to one of the upper end of the structure and the support that supports the structure (hereinafter referred to as “one part”), The first mass damper is connected to the upper end of the structure, the other of the supports (hereinafter referred to as “the other part”), and the other end of the support member. A first pulley is connected to the other part, and a second pulley is attached to the other end of the support member. Further, one end of the cable is connected to the other end of the support member, and the other end is connected to the second mass damper, and the second mass damper is further connected to the other portion.

  As described above, the support member and the first mass damper are connected in series to the one portion and the other portion from the one portion side, and the cable and the second mass damper are in parallel with the first mass damper. And connected in series to the support member and the other part. Therefore, when one part is a support and the other part is an upper end portion of the structure, the vibration damping device and the model of the structure according to the present invention are shown as in FIG. 15, for example.

  When a structure vibrates due to an earthquake or the like, especially when the structure is high-rise, the bending deformation is superior to the shear deformation of the structure. It is performed in such a manner that it is repeatedly reciprocated (hereinafter referred to as “rocking of the structure”) (see FIG. 13 described later). As apparent from FIG. 15, when the structure vibrates, the displacement due to the vibration of the structure relative to the support is transmitted to the first mass damper via the support member, whereby the first rotating mass of the first mass damper rotates. Then, the first additional vibration system including the support member and the first mass damper vibrates. Therefore, by tuning (resonating) the natural frequency of the first additional vibration system to the natural frequency of the structure, the vibration energy of the structure is absorbed by the first additional vibration system, thereby suppressing the vibration of the structure. Is done.

  When the first additional vibration system vibrates in a state where its natural frequency is synchronized with the natural frequency of the structure, as shown in FIG. 16, the other end of the support member and the structure The maximum value of the displacement between the upper end portions (shown by a two-dot chain line) is larger due to the resonance effect (tuning effect) than the maximum value of the displacement between the support and the upper end portion of the structure (shown by a solid line). Therefore, it becomes larger than the conventional case where the first mass damper is not provided, and the phase between the two is about π / 2. Further, according to the present invention, the displacement between the other end of the support member and the upper end of the structure is transmitted to the second mass damper via the cable wound around the first and second pulleys. The second rotating mass rotates, and the second additional vibration system including the cable and the second mass damper vibrates. In this case, since the first pulley is connected to the upper end of the structure and the second pulley is attached to the other end of the support member, one of the two pulleys functions as a moving pulley with respect to the other. .

  Due to the increase effect of displacement due to the resonance of the first additional vibration system described above and the increase effect of displacement due to the moving pulley composed of the first and second pulleys, the second through the support member and the cable along with the vibration of the structure. The displacement transmitted to the mass damper can be further increased, whereby the vibration energy of the structure absorbed by the second additional vibration system composed of the cable and the second mass damper can be increased. Thus, unlike the conventional case, not only the displacement increasing effect due to the moving pulley but also the displacement increasing effect due to the resonance of the first additional vibration system is obtained, so the number of the first and second pulleys is increased. Since it is not necessary, the length of the cable, that is, the rigidity of the cable can be set appropriately, and thereby the vibration control effect by the entire apparatus including the second mass damper can be appropriately obtained.

  Further, the second additional vibration system (cable, second mass damper) described above is not provided in parallel with the entire first additional vibration system (support member, first mass damper), and the first additional vibration system is not provided. Since the operation of the second additional vibration system acts in parallel with the operation of the first rotating mass, the natural frequency of the additional vibration system configured by the combination of the first and second additional vibration systems is 2 Each combination natural frequency exists separately.

  Therefore, by setting the masses of the first and second rotating masses and the spring constants of the support member and the cable (hereinafter referred to as “specifications of the first and second additional vibration systems”), the above two unique combinations Each frequency can be appropriately multiple-tuned to two different desired natural frequencies of the structure, and thus vibrations caused by two different desired vibration modes of the structure can be appropriately suppressed. . Alternatively, by setting the specifications of the first and second additional vibration systems, the two combined natural frequencies can be appropriately multiple-tuned to the same desired natural frequency of the structure, and thus the structure The vibration by one desired vibration mode can be suppressed more appropriately.

  In addition, the above operation / effect is not limited to the case where one part is a support and the other part is the upper end portion of the structure (FIG. 15). The same can be obtained when the upper end of the object and the other part is a support.

  The invention according to claim 2 is the vibration damping device for a structure according to claim 1, further comprising a buckling prevention mechanism provided in the structure for preventing buckling of the support member. .

  As described above, during vibration, the structure swings with bending deformation, and the displacement of the structure is transmitted to the first mass damper via the support member extending in the vertical direction. Since the compressive load and the tensile load act alternately, the support member may be buckled by the compressive load. According to the configuration described above, the buckling of the support member is prevented by the buckling prevention mechanism provided in the structure, so that the displacement of the structure is well transmitted to the first and second mass dampers via the support member. And the vibration damping effect of the structure can be obtained more appropriately.

  The invention according to claim 3 is the vibration damping device for a structure according to claim 2, wherein the buckling prevention mechanism is attached to one of the structure and the support member, and has a rail extending in the vertical direction, the structure, and The slider is attached to the other of the support members, engages with the rail, and is movable relative to the rail only in the length direction of the rail.

  As is clear from the configuration described in the first aspect of the invention, the support member alternately moves (vibrates) in the vertical direction as the structure is swung by vibration. According to the above-described configuration, the rail attached to one of the structure and the support member extends in the vertical direction, and the slider attached to the other of the structure and the support member engages with the rail, and the rail It is movable only in the length direction. Thereby, the vertical movement of the support member described above can be performed smoothly while preventing buckling of the support member. As a result, the displacement of the structure can be satisfactorily transmitted to the first and second mass dampers via the support member, and the vibration damping effect of the structure can be obtained more appropriately.

  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, the column member is composed of a pair of H-section steels, and the pair of H-section steels is vertical. Are arranged in a horizontal direction along the vertical plane of the structure extending in the direction, and the main surface of one flange of the pair of H-section steels is arranged to be parallel to the vertical plane of the structure. And a beam member connected to the pair of H-shaped steels and extending in the horizontal direction.

  As is well known, the H-shaped steel is not easily deformed with respect to a bending moment around a strong axis, and is easily deformed with respect to a bending moment around a weak axis. According to the above-described configuration, the column member is composed of a pair of H-section steels, and the pair of H-sections are aligned with each other in the horizontal direction along the vertical plane of the structure extending in the vertical direction, and one of them. The main surface of the flange is arranged so as to be parallel to the vertical surface of the structure. Furthermore, a pair of H-section steel is mutually connected by the beam material extended in a horizontal direction. In this way, a ramen structure is constituted by a pair of columnar members made of H-shaped steel and beams.

  With the above configuration, even if a pressing force acts on the support member from the structure due to vibration (bending deformation) of the structure, the strong shaft of the columnar H-shaped steel is supported by a buckling prevention mechanism. The buckling of the member can be surely prevented, and with respect to the weak axis of the H-shaped steel of the column member, the above-described frame structure and a buckling prevention mechanism composed of a beam extending in the horizontal direction and a pair of column members. The buckling of the support member can be reliably prevented.

  According to a fifth aspect of the present invention, in the vibration damping device for a structure according to any one of the first to fourth aspects, the portion of the support member that is close to the connecting portion with the first mass damper is locked. By this, it is further provided with the twist prevention mechanism for preventing the twist of a support member.

  As is apparent from the description of the invention according to claim 1, the reaction force torque of the first mass damper is generated and transmitted to the support member as the first rotary mass rotates, and thus the support member may be largely twisted. There is. Here, when the first mass damper is of a ball screw type, for example, in an ideal state where there is no friction of the ball screw, the reaction force torque Tn of the first mass damper is equal to the axial reaction force Pn of the first mass damper and the ball It is proportional to the lead length Ld (pitch) of the screw and is represented by Tn = (Pn × Ld) / (2π). According to the configuration described above, the twist of the support member due to the reaction torque is prevented by locking and restraining the support member by the twist prevention mechanism provided in the structure.

  Therefore, the displacement of the structure transmitted to the first mass damper via the support member can be favorably converted into the rotational motion of the first rotary mass without being affected by the reaction torque of the first mass damper, thereby The vibration of the structure can be appropriately suppressed. In this case, since the portion close to the connecting portion of the support member with the first mass damper is locked, the support member can be effectively prevented from being twisted.

  According to a sixth aspect of the present invention, in the vibration damping device for a structure according to any one of the first to fifth aspects, one end of the support member is connected to the support, and the first mass damper, the first pulley, The second mass damper is connected to the upper end of the structure, and a guide hole penetrating in the vertical direction is formed at the other end of the support member. One end of the cable is inserted into the guide hole from above. The cable is pretensioned, and one end of the cable, in order from the top, is the other end of the support member when the structure is not vibrating. And a weight for applying tension to the cable.

  According to this structure, the one end part, ie, the lower end part, of the support member is connected to the support body, and the support member extends upward from the support body. Moreover, the 1st mass damper, the 1st pulley, and the 2nd mass damper are connected with the upper end part of the structure, and the 1st mass damper is further connected with the other end part, ie, the upper end part, of the support member. Furthermore, one end of the cable is connected to the upper end of the support member, and the other end of the cable is connected to the second mass damper.

  The reaction force of the second mass damper acts on the cable in the direction of increasing the tension of the cable when the structure swings to the opposite side of the support member due to vibration (that is, acts as a tensile force). When the arm swings toward the support member, it acts in a direction to reduce the cable tension. For this reason, when one end part of the cable is directly attached to the support member, when the structure swings toward the support member, the cable may be loosened and come off the first and second pulleys.

  According to the present invention, the guide hole penetrating in the vertical direction is formed in the other end portion, that is, the upper end portion of the support member, the cable is pre-tensioned, and the one end portion of the cable is located above the guide hole. And is positioned below the guide hole. In addition, a stopper portion that comes into contact with the upper end portion of the support member from below when the structure is not vibrating and a weight for applying tension to the cable are attached to one end portion of the cable in order from the upper side. Yes. As described above, the cable is connected to the support member by the stopper portion attached to one end thereof coming into contact with the upper end portion of the support member. In addition, when the structure is swung to the opposite side of the support member due to vibration, the reaction force of the second mass damper acts as a tensile force on the cable as described above, so that the stopper portion of the cable becomes the upper end of the support member. The state of contact with the portion is maintained, the connection state between the cable and the support member is maintained, and the tension of the cable increases.

  On the other hand, when the structure swings to the support member side due to vibration, the reaction force of the second mass damper acts in a direction to reduce the cable tension as described above, so that one end of the cable is connected to the upper end of the support member. The stopper portion of the cable moves away from the upper end portion of the support member, and the connection between the cable and the support member is released. In this case, since a weight for applying tension is attached to one end of the cable, the cable can be held in a tensioned state without being loosened by the gravity of the weight. Therefore, the cable is connected to the first and second pulleys. Can be prevented from coming off.

It is a front view which shows roughly the damping device by embodiment of this invention with the structure to which this is applied. It is a top view which shows the positional relationship of a structure, a supporting member, and a twist prevention mechanism. It is a top view which expands and shows a structure, a pillar material, a buckling prevention mechanism, etc. It is a side view which expands and shows a structure, a pillar material, and a beam material. It is sectional drawing of a 1st mass damper. It is a figure which shows the cross section of a 2nd mass damper with the left and right cables. It is a front view which expands and shows a structure, a 1st mass damper, a pillar material, a right cable, etc. It is a side view which expands and shows a structure, a right cable, a 1st pulley, a 2nd pulley, etc. It is a figure which abbreviate | omits hatching and shows the cross section of a twist prevention mechanism and a column material. It is sectional drawing which follows the XX line of FIG. It is a front view which expands and shows a column material and a buckling prevention mechanism. It is a front view which shows roughly the condition where a structure rock | fluctuates at the time of a vibration. It is a front view which expands and shows a structure, a 1st mass damper, a pillar material, a right cable, etc. about the case where a structure rock | fluctuates rightward. It is a figure which shows the relationship between a cable displacement and a cable reaction force. It is a figure which models and shows the damping device by this invention. The relationship between the displacement (two-dot chain line) between the other end part of the support member of the vibration damping device by this invention and the upper end part of a structure, and the displacement (solid line) between a support body and the upper end part of a structure is shown. FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. A structure B shown in FIG. 1 is a high-rise building, and is erected on a foundation F provided on the ground. The vibration damping device includes a plurality of first additional vibration systems VA1 configured by the support member 2 and the first mass damper 3, and a plurality of second additional vibration systems VA2 configured by the second mass damper 4 and the cable 5. . The vibration damping device synchronizes the natural frequency of the first and second additional vibration systems VA1 and VA2 with the natural frequency of the structure B that vibrates during an earthquake or the like, so that the vibration energy of the structure B is increased. It is absorbed and suppressed by the first and second additional vibration systems VA1 and VA2. In the following description, the left side of FIG. 1 is “left”, the right side is “right”, the front side is “front”, the back side is “rear”, the upper side is “up”, and the lower side is “lower”.

  As shown in FIG. 1, a total of two first additional vibration systems VA1 are provided along the side surface of the structure B. Specifically, one on each of the left side and the right side in FIG. 1 is arranged symmetrically around the structure B.

  As shown in FIGS. 2 to 4, each support member 2 has a pair of column members 6 and 6 made of H-shaped steel and a total of seven beam members 7 (only two are shown in FIG. 4). These column members 6 and 6 and the beam member 7 constitute a ramen structure and are arranged outside the structure B. Each column member 6 has a lower end portion fixed to the foundation F and extending in the vertical direction. The main surface of one flange 6a of the H-shaped steel (hereinafter referred to as “flange facing surface FS”) is the structure B. It is arranged so as to be parallel to the side surface. The number of beam members 7 is not limited to seven and is arbitrary.

  Further, the pair of column members 6 and 6 are arranged in the front-rear direction along the side surface of the structure B, and a plate-like attachment portion 6 b extending in the front-rear direction is welded to the upper ends of both the members 6 and 6. It is attached with. A guide hole 6c penetrating in the vertical direction is formed at the center in the front-rear direction of the mounting portion 6b. Furthermore, the beam member 7 is connected to the pair of column members 6 and 6 by bolts or the like, and extends horizontally along the side surface of the structure B in the front-rear direction. Further, the main surface of the web 7 a of the beam member 7 faces the side surface of the structure B.

  Since the first mass damper 3 is configured in the same manner as that disclosed in Japanese Patent Application No. 2012-158921 proposed by the inventor of the present invention, the first mass damper 3 will be briefly described below. As shown in FIG. 5, the first mass damper 3 includes an inner cylinder 11, a ball screw 12, a first rotating mass 13, and a limiting mechanism 14. The inner cylinder 11 is made of a cylindrical steel material. One end of the inner cylinder 11 is open, and the other end is attached to the first flange 15.

  The ball screw 12 includes a screw shaft 12a and a nut 12c that is screwed to the screw shaft 12a via a large number of balls 12b. One end of the screw shaft 12 a is accommodated in the opening of the inner cylinder 11 described above, and the other end of the screw shaft 12 a is attached to the second flange 16. The nut 12 c is rotatably supported by the inner cylinder 11 via a bearing 17.

  The first rotating mass 13 is made of a material having a large specific gravity, for example, iron, and is formed in a cylindrical shape. The first rotating mass 13 covers the inner cylinder 11 and the ball screw 12 and is rotatably supported by the inner cylinder 11 via a bearing 18. A pair of ring-shaped sealing materials 19 and 19 are provided between the first rotating mass 13 and the inner cylinder 11. A space formed by the sealing materials 19, 19, the first rotating mass 13 and the inner cylinder 11 is filled with a viscous body 20 made of silicon oil.

  In the first mass damper 3 configured as described above, when a relative displacement occurs between the inner cylinder 11 and the screw shaft 12a, the limiting mechanism 14 is operated in a state where the relative displacement is converted into a rotational motion by the ball screw 12. The first rotating mass 13 is rotated by being transmitted to the first rotating mass 13 through the first rotating mass 13. Hereinafter, the operation of the first mass damper 3 that converts the relative displacement between the inner cylinder 11 and the screw shaft 12a into the rotational motion of the first rotary mass 13 in this way is referred to as “rotational conversion operation of the first mass damper 3”.

  The restriction mechanism 14 restricts the rotational conversion operation of the first mass damper 3, and is composed of a ring-shaped rotary sliding material 14a, a plurality of screws 14b, and springs 14c (only two are shown). . The rotary sliding material 14 a is disposed between the first rotary mass 13 and the nut 12 c of the ball screw 12. A plurality of spring accommodating holes 13a are formed in the portion of the first rotating mass 13 where the rotating sliding material 14a is disposed. These spring accommodation holes 13a are arranged at equal intervals in the circumferential direction and penetrate in the radial direction. A screw 14b is screwed into each spring accommodating hole 13a, and a spring 14c is accommodated between the screw 14b and the rotary sliding material 14a.

  With the above configuration, when the screw 14b is strongly tightened, the rotating sliding material 14a is strongly pressed against the nut 12c by the urging force of the spring 14c, whereby the first rotating mass 13 is integrated with the nut 12c via the rotating sliding material 14a. It becomes the state connected to.

  Further, when the screw 14b is loosened from this state, the tightening degree is lowered, and the load acting in the axial direction of the first mass damper 3 (hereinafter referred to as “axial load”) is determined according to the tightening degree of the screw 14b. The first rotating mass 13 rotates integrally with the nut 12c until the limit load is reached. On the other hand, when the axial load of the first mass damper 3 reaches the limit load, the rotation conversion operation of the first mass damper 3 is limited by the occurrence of slippage between the rotating sliding material 14a and the nut 12c or the first rotating mass 13. Is done. In this state, the rotational inertia force of the first rotating mass 13 that is reduced due to the restriction of the rotational conversion operation of the first mass damper 3 due to the frictional resistance generated between the rotating sliding material 14a and the nut 12c or the first rotating mass 13 is reduced. Be compensated.

  The first flange 15 of the first mass damper 3 having the above configuration is connected to the upper wall WU projecting from the roof R of the structure B to the left and right outer sides with bolts, and the second flange 16 is described above. The support member 2 is connected to the attachment portion 6b at the upper end portion by a bolt or the like. Thus, the first mass damper 3 and the support member 2 are connected in series to the rooftop R and the foundation F of the structure B.

  Next, the second additional vibration system VA2 will be described. One second additional vibration system VA2 is provided at the upper end of the structure B. Since the second mass damper 4 of the second additional vibration system VA2 is configured in the same manner as that disclosed in Japanese Patent No. 3830132 proposed by the inventors of the present invention, the second mass damper 4 will be simply described below. explain. As shown in FIG. 6, the second mass damper 4 is basically configured similarly to the first mass damper 3, and includes an outer cylinder 21, a ball screw 22, a second rotating mass 23, a viscous body 24, and a pair of Guides 25 are provided.

  The screw shaft 22 a of the ball screw 22 is inserted into a hole provided in the radial center of the pair of side walls of the outer cylinder 21, and is partially accommodated in the outer cylinder 21, and both ends of the outer cylinder 21 in the axial direction. It protrudes outward from the part. The screw shaft 22a is movable in the axial direction with respect to the outer cylinder 21, and a nut 22c is screwed to the screw shaft 22a via a large number of balls 22b. The nut 22c and the second rotating mass 23 are fixed integrally with each other, and are rotatably supported and accommodated in the outer cylinder 21 via a plurality of bearings 26. Further, a space is formed between the outer cylinder 21 and the second rotating mass 23, and a viscous body 24 is filled in this space.

  In the second mass damper 4 having the above configuration, when a relative displacement occurs between the outer cylinder 21 and the screw shaft 22a, the relative displacement is transmitted to the second rotating mass 23 in a state converted into a rotational motion by the ball screw 22. As a result, the second rotating mass 23 rotates.

  Furthermore, the screw shaft 22a is formed with a spline groove 22d extending in the axial direction. The pair of guides 25, 25 are cylindrical, and are concentrically fixed to both side walls of the outer cylinder 21. A screw shaft 22 a is inserted into the radial center hole of each guide 25, and the screw shaft 22 a protrudes outward from the guide 25. Furthermore, a plurality of hemispherical grooves 25a are formed on the inner peripheral surface of the guide 25, and the same number of balls 25b as the grooves 25a are provided. Half of these balls 25b are engaged with the grooves 25a, and the other half are engaged with the spline grooves 22d of the screw shaft 22a described above, and are rotatable within these grooves 25a and 22d. is there. In FIG. 6, some reference numerals of the ball 22 b, the groove 25 a, and the ball 25 b are omitted.

  In the guide 25 and the screw shaft 22a configured as described above, when the screw shaft 22a reciprocates in the axial direction with respect to the outer cylinder 21, the ball 25b moves on the spline groove 22d without moving in the circumferential direction with respect to the guide 25. As a result, the screw shaft 22a can be reciprocated without trouble. Moreover, in the 2nd mass damper 4, reaction force torque acts on the screw shaft 22a from the 2nd rotation mass 23 with generation | occurrence | production of the relative displacement between the outer cylinder 21 and the screw shaft 22a on the structure. On the other hand, the ball 25b is engaged with the hemispherical groove 25a of the guide 25 fixed to the outer cylinder 21 and the spline groove 22d extending in the axial direction of the screw shaft 22a. Even if torque acts on the screw shaft 22a, the rotation of the screw shaft 22a relative to the outer cylinder 21 is prevented.

  Moreover, as shown in FIG.1 and FIG.6, the 2nd mass damper 4 fixes the outer cylinder 21 to the attachment part T integrally provided in the center of the left-right direction of the rooftop R of the structure B, It is connected to the roof R of the structure B, and the outer cylinder 21 and the screw shaft 22a extend in the left-right direction.

  The cable 5 of the second additional vibration system VA2 includes a left cable 5a and a right cable 5b, and both the cables 5a and 5b are arranged symmetrically about the structure B. Both the left and right cables 5a and 5b are made of steel wires, and their spring constants are set to the same value. Both cables 5a and 5b have a pretension set as described later. Has been granted.

  As shown in FIG. 7, one end of the right cable 5 b is inserted from above into the guide hole 6 c of the mounting portion 6 b of the right support member 2. One end portion of the right cable 5b is located below the guide hole 6c, and this one end portion comes into contact with the attachment portion 6b from below when the structure B is not vibrating in order from the upper side. A stopper 31 and a weight 32 for applying tension to the right cable 5b are attached. The stopper part 31 is comprised with the double nut etc., and has a larger diameter than the guide hole 6c. Further, the weight 32 is provided with an anti-sway mechanism (not shown) for preventing the shake.

  As shown in FIGS. 1, 7 and 8, the right cable 5b is wound around the first pulley 8 and the second pulley 9 in the middle thereof, and the other end of the right cable 5b is connected to the second cable 5b. The mass damper 4 is connected to the right end of the aforementioned screw shaft 22a (see FIG. 6).

  The first pulley 8 is composed of two pulleys, is attached to the right end portion of the above-described upper wall WU of the structure B, and protrudes rightward from the upper wall WU. The two pulleys constituting the first pulley 8 are arranged in the front-rear direction and are rotatable about an axis extending in the front-rear direction. The second pulley 9 is composed of one pulley, is attached to the upper surface of the attachment portion 6b of the support member 2, and is rotatable about an axis extending in the front-rear direction.

  The right cable 5b extends upward from the guide hole 6c of the support member 2, is wound around the front first pulley 8 and extends downward, and is further wound around the second pulley 9 and extends upward, It is wound around the first pulley 8 and extends leftward toward the second mass damper 4.

  The above description of the right cable 5b, the stopper portion 31, the weight 32, the first and second pulleys 8 and 9 is similarly applied to the left cable 5a except that the left and right sides are reversed, and thus detailed description thereof is omitted. To do. Further, since the left and right cables 5a and 5b are provided symmetrically about the second mass damper 4, the tensile force due to the pre-tension of both the cables 5a and 5b is applied to the screw shaft 22a of the second mass damper 4. Acts in opposite directions. Thereby, the screw shaft 22a is held at the neutral position shown in FIG.

  The vibration damping device further includes a twist prevention mechanism 41 and a buckling prevention mechanism 51. The twist preventing mechanism 41 is for preventing the support member 2 from being twisted by a large reaction force torque acting from the first mass damper 3 in accordance with the rotation conversion operation of the first mass damper 3 described above. Further, the buckling prevention mechanism 51 is for preventing buckling of the support member 2 (column members 6 and 6) due to a compressive load that acts as the structure B swings due to vibration.

  As shown in FIGS. 1, 9, and 10, the torsion prevention mechanism 41 is disposed immediately below the first mass damper 3, and is attached to the slab 42 and the restraining slab 42 provided in the structure B. The sliding plate 43 is configured.

  The slab 42 is made of concrete provided integrally with the structure B, and extends horizontally along the outer periphery of the structure B (see FIGS. 1 and 2). A plurality of rectangular restraint holes 42a are formed in the slab 42 at positions corresponding to the pillar members 6 and 6 of the support member 2, and the pillar member 6 is inserted into each restraint hole 42a.

  The sliding plate 43 is made of a material having lubricity, for example, a fluororesin, and is attached to the four wall surfaces of the restraining hole 42a. Further, contact plates 2a made of stainless steel or the like are attached to the flange facing surface FS of the column member 6 and the main surface of the other flange 6a at positions corresponding to the restraining holes 42a. The abutting plate 2a faces the sliding plate 43 with a slight gap.

  Four buckling prevention mechanisms 51 are provided for each support member 4 (four are shown in FIG. 1), and a total of eight buckling prevention mechanisms 51 are provided. Are arranged at equal intervals from each other at the lower four positions.

  As shown in FIGS. 3 and 11, each buckling prevention mechanism 51 has a pair of rails 52 and 52 and sliders 53 and 53. Each rail 52 is formed in a rod shape, is attached to the flange facing surface FS of the column member 6 with a bolt or the like, and extends in the vertical direction. The rail 52 is formed with a pair of front and rear guide grooves 52a extending in the vertical direction (only one is shown in FIG. 11), and a plurality of balls (not shown) can freely roll in each guide groove 52a. Is fitted.

  Each slider 53 has a U-shaped cross section when viewed from the plane, and a concave portion 53a is open to the support member 2 side. The slider 53 abuts the side surface of the recess 53 a against the side surface of the rail 52 and engages with the guide groove 52 a of the rail 52 through the above-described ball, and is movable only in the length direction of the rail 52 ( It cannot move in the front-rear direction and the left-right direction). Further, the side surface of the slider 53 on the structure B side is attached to the side surface of the structure B via the attachment member 53b.

  In the vibration damping device having the above configuration, as shown in FIG. 12, when the structure B swings due to an earthquake or the like, the displacement of the structure B is transmitted to the first mass dampers 3 and 3 via the support members 2 and 2. And transmitted to the second mass damper 4 via the support members 2 and 2 and the left and right cables 5a and 5b. Accordingly, the first rotary mass 13 is rotated by the rotation conversion operation of the first mass damper 3, and the compressive load and the tensile load are alternately and repeatedly applied to the support member 2, and the first mass damper 3 composed of the support member 2 and the first mass damper 3. 1 Additional vibration system VA1 vibrates. Thereby, the vibration of the structure B is suppressed by the vibration energy of the structure B being absorbed by the first additional vibration system VA1.

  In this case, the mass of the first rotating mass 13 and the spring constant of the support member 2 are such that the natural frequency of the first additional vibration system VA1 is the primary natural frequency of the structure B (the natural frequency when the vibration mode is the primary mode). ).

  Further, when the first additional vibration system VA1 vibrates in a state where its natural frequency is synchronized with the primary natural frequency of the structure B, as described above with reference to FIG. Since the maximum value of the displacement between the upper end portion and the rooftop R of the structure B is larger than the maximum value of the displacement between the foundation F and the rooftop R, the aforementioned conventional mass damper 3 is not provided. And the phase between the two is about π / 2.

  According to the present embodiment, the displacement between the upper end of the support member 2 and the rooftop R is the second via the left and right cables 5a and 5b wound around the first and second pulleys 8 and 9. The second rotary mass 23 is transmitted to the mass damper 4, and the second additional vibration system VA2 including the left and right cables 5a and 5b and the second mass damper 4 vibrates. In this case, since the first pulley 8 is connected to the rooftop R and the second pulley 9 is attached to the upper end portion of the support member 2, one of the pulleys 8 and 9 is a moving pulley with respect to the other. Function. As a result, the displacement transmitted to the second mass damper 4 via the left and right cables 5a, 5b is doubled by the number of turns of each cable in the first and second pulleys 8, 9 (value 3, see FIG. 8). To do.

  Due to the above-described displacement increasing effect due to the resonance of the first additional vibration system VA1 and the displacement increasing effect due to the moving pulley composed of the first and second pulleys 8 and 9, the supporting member 2 and The displacement transmitted to the second mass damper 4 via the left and right cables 5a and 5b can be further increased, so that the second additional vibration system VA2 including the left and right cables 5a and 5b and the second mass damper 4 can be used. The vibration energy of the structure B to be absorbed can be increased. Thus, unlike the conventional case, not only the displacement increasing effect due to the moving pulley but also the displacement increasing effect due to the resonance of the first additional vibration system VA1 can be obtained, so that the first and second pulleys 8 and 9 Since it is not necessary to increase the number, the lengths of the left and right cables 5a and 5b, that is, the rigidity (spring constant) of the left and right cables 5a and 5b can be set appropriately, and thereby the vibration control including the second mass damper 4 is performed. The vibration control effect by the whole apparatus can be obtained appropriately.

  Further, the first and second additional vibration systems VA1 and VA2 in the present embodiment are shown in the same manner as in FIG. As is apparent from this model diagram, the second additional vibration system VA2 is not provided in parallel with the entire first additional vibration system VA1, and the operation of the first rotating mass 13 of the first additional vibration system VA1. On the other hand, the operation of the second additional vibration system VA2 acts in parallel. Therefore, two combined natural frequencies exist separately as the natural frequencies of the additional vibration system configured by combining the first and second additional vibration systems VA1 and VA2.

  According to the present embodiment, the masses of the first and second rotating masses 13 and 23 and the spring constants of the support member 2 and the left and right cables 5a and 5b (hereinafter referred to as various characteristics of the first and second additional vibration systems VA1 and VA2). The above-mentioned two combined natural frequencies are multiple-tuned to the primary natural frequency and the secondary natural frequency of the structure B (the natural frequency when the vibration mode is the secondary mode), respectively. Is set. Thereby, the vibration by the primary and secondary vibration mode of the structure B can be suppressed appropriately. Note that the two combined natural frequencies may be multiple-tuned to the same desired natural frequency of the structure by setting the specifications of the first and second additional vibration systems VA1 and VA2.

  Further, even when a compressive load is applied to the support member 2 as the structure B swings, the structure B is attached to the rail 52 of the buckling prevention mechanism 51 attached to the column member 6 of the support member 2. Since the slider 53 is engaged so as to be movable only in the vertical direction, buckling of the support member 2 due to this compressive load can be prevented.

  Further, each of the pair of column members 6 and 6 is made of H-shaped steel, and is lined up in the front-rear direction along the side surface of the structure B (the vertical surface of the structure B extending in the vertical direction), and the flanges thereof. It arrange | positions so that the opposing surface FS may become in parallel with the side surface of the structure B. FIG. Further, the pair of column members 6 and 6 are connected to each other by a beam member 7 extending in the horizontal direction. Thus, the pair of pillar members 6 and 6 and the beam member 7 constitute a ramen structure.

  With the above configuration, even if a pressing force acts on the support member 2 from the structure B due to the vibration (bending deformation) of the structure B, the column member 6 is buckled about the strong axis of the H-shaped steel. By preventing the buckling mechanism 51 from buckling, the buckling of the support member 2 can be reliably prevented. In addition, with respect to the weak axis of the H-shaped steel of the column member 6, coupled with the buckling prevention by the buckling prevention mechanism 51 due to the frame structure composed of the beam 7 extending in the horizontal direction and the pair of column members 6, 6, The buckling of the support member 2 can be reliably prevented.

  Further, when the reaction force torque acts on the column members 6 and 6 of the support member 2 from the first mass damper 3 due to the rotation conversion operation of the first mass damper 3, the column members 6 and 6 are likely to be twisted. The material 6 is restrained by being locked at the edge of the restraining hole 42 a of the twist preventing mechanism 41. Thereby, even when the large reaction force torque of the 1st mass damper 3 acts, torsion of the support member 2 whole by it can be prevented reliably. Further, since the twist preventing mechanism 41 is disposed immediately below the first mass damper 3 and locks the portion of the support member 2 that is close to the connecting portion with the first mass damper 3, the support member 2 can be effectively prevented from being twisted. Can do.

  As a result of preventing the buckling and twisting of the support member 2 as described above, the displacement of the structure B is transmitted through the support member 2 to the first and second mass dampers 3 and 4 without loss, It can convert into the rotational motion of the 2nd rotation mass 13 and 23 favorably, Therefore, the vibration of the structure B can be suppressed appropriately.

  Further, as is clear from the above-described configuration, as the structure B swings due to vibration, the support member 2 alternately moves (vibrates) in the vertical direction, whereas the rail of the buckling prevention mechanism 51 Since 52 extends in the vertical direction and the slider 53 is movable in the length direction of the rail 52, it is possible to smoothly move the support member 2 in the vertical direction while preventing the support member 2 from buckling. it can. Further, since the support member 2 (the column member 6) contacts the sliding plate 43 via the contact plate 2a of the twist prevention mechanism 41, the support member 2 moves relative to the restraining hole 42a in the vertical direction. The frictional resistance is reduced, so that the support member 2 can be moved smoothly. As described above, the rail 52, the slider 53, the contact plate 2a, and the sliding plate 43 can smoothly move the support member 2 in the vertical direction, so that the transmission loss of the displacement of the structure B can be further suppressed. .

  Further, a guide hole 6c penetrating in the vertical direction is formed in the mounting portion 6b provided at the upper end of the support member 2, and one end of each of the left and right cables 5a and 5b is inserted into the guide hole 6c from above. While being inserted, it is positioned below the guide hole 6c. The left and right cables 5a and 5b are pre-tensioned, and one end of each of the cables 5a and 5b is attached to the attachment portion 6b when the structure B is not vibrating sequentially from the top. A stopper portion 31 that contacts from below and a weight 32 for applying tension to each of the cables 5a and 5b are attached. Thus, the left and right cables 5a and 5b are connected to the support members 2 and 2 by the stopper portion 31 attached to one end thereof contacting the attachment portion 6b.

  Further, as shown by a two-dot chain line in FIG. 12, when the structure B swings leftward due to vibration, the reaction force of the second mass damper 4 acts as a tensile force on the right cable 5b, thereby The state in which the stopper portion 31 of the cable 5b is in contact with the mounting portion 6b at the upper end portion of the right support member 2 is maintained (see FIG. 7), and the connection state between the right cable 5b and the support member 2 is maintained. The tension of the right cable 5b increases.

  On the other hand, as shown by a solid line in FIG. 12, when the structure B swings to the right due to vibration, the reaction force of the second mass damper 4 acts in a direction to reduce the tension of the right cable 5b. As a result, the pretension of the right cable 5b is eliminated, so that one end portion thereof moves downward with respect to the mounting portion 6b of the right support member 2, and as a result, as shown in FIG. 13, the stopper of the right cable 5b. The part 31 is separated from the attachment part 6b of the right support member 2, and the connection between the right cable 5b and the support member 2 is released. In this case, since a weight 32 for applying tension is attached to one end of the right cable 5b, the right cable 5b can be held in a tensioned state without being loosened by the gravity of the weight 32. It can prevent that 5b remove | deviates from the 1st and 2nd pulleys 8 and 9. FIG.

  The actions and effects described with reference to FIGS. 7, 12, and 13 can be obtained similarly for the left cable 5a.

  Further, the pre-tension of the left and right cables 5a and 5b is set as follows. That is, FIG. 14 shows the total displacement of both cables 5a and 5b (deformation amount, hereinafter referred to as “cable displacement”) and the resultant force of both cables 5a and 5b (hereinafter referred to as “cable reaction force F”). Showing the relationship. In the figure, k is the spring constant of each of the cables 5a and 5b. As described above, the reaction forces of the left and right cables 5a and 5b due to the pretension act on the screw shaft 22a in opposite directions, whereby the screw shaft 22a is held in the neutral position.

  When the structure B swings to the right due to vibration, the reaction force of the second mass damper 4 increases the elongation of the left cable 5a, and the reaction force increases, while the elongation of the right cable 5b due to pretension decreases. The reaction force also decreases. When the extension of the right cable 5b due to the pretension is lost, the cable reaction force F is only the reaction force of the left cable 5a.

  On the contrary, when the structure B swings to the left due to vibration, the reaction force of the second mass damper 4 increases the elongation of the right cable 5b, which increases the reaction force, while the left cable due to pretensioning increases. The elongation of 5a decreases and the reaction force also decreases. When the extension of the left cable 5a due to the pretension is lost, the cable reaction force F is only the reaction force of the right cable 5b.

  From the above operation, the relationship between the cable displacement and the cable reaction force F is shown in FIG. 14, for example. The relationship between the two is shown in the same figure, and the greater the displacement of the structure B, the greater the displacement of the cable. Therefore, the spring constant (tangential rigidity) of the left and right cables 5a, 5b is the structure. Bilinear characteristics with respect to the displacement of B.

  In the present embodiment, the spring constant k of each of the left and right cables 5a, 5b is more specifically set to the k + k of the spring constant of the entire left and right cables 5a, 5b due to the tension of both the cables 5a, 5b. When = 2k, the above-described two combined natural frequencies are set so as to be multiplex-tuned to the primary and secondary natural frequencies of the structure B, respectively. In addition, the pretension of the left and right cables 5a and 5b is set so that one of the left and right cables 5a and 5b has no pretension when the displacement of the structure B becomes larger than a predetermined value.

  By setting the spring constant k and the pretension of the left and right cables 5a and 5b as described above, the reaction force of the first and second mass dampers 3 and 4 causes vibration of the structure B as the displacement of the structure B increases. Before being oversized in synchronism, the spring constant of both cables 5a and 5b becomes smaller, so that the two combined natural frequencies are different from the primary and secondary natural frequencies of the structure B, respectively. Therefore, the reaction force of the first and second mass dampers 3 and 4 can be suppressed. Therefore, it is possible to prevent an excessive stress from being generated in the structure B, the left and right cables 5a and 5b, the support member 2, the first and second mass dampers 3 and 4. Alternatively, when the spring constant k of each of the left and right cables 5a and 5b is k + k = 2k, the combined frequency of the two cables 5a and 5b is the same one desired for the structure B. It is also possible to set so that multiple tuning is performed at the natural frequency.

  Alternatively, the spring constant k and pretension of the left and right cables 5a and 5b may be set as follows. That is, the pretension of the left and right cables 5a and 5b is set to a relatively small value such as the weight of the weight 32, and the spring constant k of both the cables 5a and 5b is set to be in a tension state. Therefore, when the spring constant of the entire left and right cables 5a and 5b is k, the two combined natural frequencies are respectively tuned to the primary and secondary natural frequencies of the structure B. Or you may set so that it may carry out multiple tuning to the same one desired natural frequency of the structure B. FIG. In that case, as the left and right cables 5a and 5b, it is possible to adopt a cheaper cable having lower strength.

  Further, an attenuation mechanism for attenuating the rotation of at least one of the first and second pulleys 8 and 9 may be provided. The damping mechanism includes, for example, a gear integrally provided coaxially with the at least one pulley, a case that accommodates the gear and supports it rotatably, and a viscous material filled in the case. The The case is attached to the upper wall WU when at least one pulley is the first pulley 8, and to the attachment portion 6b of the support member 2 when the pulley is the second pulley 9.

  In the damping mechanism having the above configuration, when the left and right cables 5a and 5b are pulled in accordance with the displacement caused by the vibration of the structure B and the first and second pulleys 8 and 9 are rotated, the gear is moved into the case together with at least one pulley. The viscous body in the case is swirled by the gear. As a result, the damping force of the damping device can be obtained more effectively by the damping force of the viscous body acting on the structure B via the gear, at least one pulley, and the left and right cables 5a and 5b. it can.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in the embodiment, the lower end of the support member 2 is connected to the foundation F, but may be connected to the foundation F via the lower end of the structure B or an underground floor. Moreover, in embodiment, while connecting the lower end part of the supporting member 2 to the foundation F, and connecting the 1st pulley 8, the 1st and 2nd mass dampers 3 and 4 to the rooftop R of the structure B, it is supported. The positional relationship between the member 2 and the first pulley 8, the first and second mass dampers 3, 4 may be reversed upside down. In this case, the upper end portion of the support member is connected to the roof of the structure, and the first pulley, the first and second mass dampers are connected to the foundation. The first mass damper and one end of the cable are connected to the lower end of the support member, and the second pulley is attached. In this case, the first pulley, the first and second mass dampers may be connected to the foundation via the lower end of the structure or the underground floor.

  Furthermore, in the embodiment, the support member 2 and the first mass damper 3 are disposed on the left and right sides of the structure B. However, the support member 2 and the first mass damper 3 may be disposed on the front and rear sides. Consists of a pair of front and rear cables. In the embodiment, two first additional vibration systems VA1 and one second additional vibration system VA2 are provided. However, the number of first and second additional vibration systems is arbitrary. Further, in the embodiment, the first pulley 8 is constituted by two pulleys, and the second pulley 9 is constituted by one pulley, but the number of the first and second pulleys is arbitrary.

  In the embodiment, one second mass damper 4 is connected to the left and right support members 2 and 2 via the left and right cables 5a and 5b. However, two second mass dampers are provided, and one second mass damper is provided. May be coupled to the left support member via the left cable, and the other second mass damper may be coupled to the right support member via the right cable. In that case, a spring for holding the screw shaft of the second mass damper in the neutral position is provided in the second mass damper.

  Further, in the embodiment, the rail 52 of the buckling prevention mechanism 51 is attached to the support member 2 and the slider 53 is attached to the structure B. On the contrary, the rail 52 is attached to the structure B and the slider 53. May be attached to the support member 2 respectively. In the embodiment, the buckling prevention mechanism 51 is composed of the rail 52 and the slider 53. However, other suitable mechanisms capable of preventing the buckling of the support member 2, for example, twist prevention. Similarly to the mechanism 41, a mechanism constituted by a slab 42, a restraint hole 42a, or the like may be adopted. Alternatively, the mechanism disclosed in Japanese Patent Application No. 2012-158921 proposed by the present inventor may be employed.

  Furthermore, in the embodiment, the column member 6 is made of H-shaped steel, but may be made of any other steel material. Further, in the embodiment, the support member 2 is configured by a ramen structure using the pair of column members 6 and 6 and the beam member 7, but may be configured by only the column member. Furthermore, in the embodiment, a mechanism constituted by the slab 42, the restraining hole 42a, or the like is adopted as the twist preventing mechanism 41. However, another suitable mechanism capable of preventing the support member 2 from twisting, for example, the present invention. The mechanism disclosed in Japanese Patent Application No. 2012-158921 proposed by a person may be employed.

  In the embodiment, one end of each of the left and right cables 5a and 5b is inserted into the guide hole 6c of the support member 2, and the stopper portion 31 attached to the one end is brought into contact with the attachment portion 6b of the support member 2. Although it is connected to the support member 2 by being brought into contact, it may be connected to the support member 2 by being directly attached to the attachment portion 6b.

  Furthermore, in the embodiment, the spring constants of the left and right support members 2 and 2 are set to the same value, but may be set to different values. In that case, the natural frequency of the first additional vibration system composed of the left support member and the first mass damper is different from the natural frequency of the first additional vibration system composed of the right support member and the second mass damper. Therefore, each natural frequency can be multiple-tuned to two different natural frequencies of the structure.

  In the embodiment, the spring constants k of the left and right cables 5a and 5b are set to the same value, but may be set to different values. In that case, as apparent from the relationship between the cable displacement and the cable reaction force F shown in FIG. 14 described above, the cable reaction force is only the reaction force of the left cable when the structure swings to the right. And the natural frequency of the second additional vibration system when the cable reaction force becomes only the reaction force of the right cable when the structure swings to the left. , Each natural frequency can be multiple-tuned to two different natural frequencies of the structure.

  Furthermore, although embodiment is an example which applied the damping device to the structure B which is a high-rise building, you may apply to another structure, for example, a steel tower. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

B Structure F Foundation (support)
R Rooftop (upper end of structure)
2 Support member 3 1st mass damper 4 2nd mass damper 5a Left cable 5b Right cable 6 Column material 6a Flange 6b Attachment part (the other end part of a support member)
6c Guide hole FS Flange facing surface (main surface of one flange)
7 Beam material 8 First pulley 9 Second pulley 13 First rotating mass 23 Second rotating mass 31 Stopper portion 32 Weight 41 Torsion preventing mechanism 51 Buckling preventing mechanism 52 Rail 53 Slider

In order to achieve the above object, the invention according to claim 1 is a structure damping device for suppressing vibration of a structure supported by a support, and has a column member extending in the vertical direction. and, the other of the upper portion of the structure and the support member having one end either one is connected to the support, has a first rotating mass rotatable, an upper end of the structure and the support, A first mass damper connected to the other end of the support member, and configured to convert a displacement of the structure transmitted through the support member into a rotational motion of the first rotation mass when the structure vibrates; a first pulley coupled to the other of the upper portion and the support of the object, and a second pulley attached to the other end portion of the support member, one end portion is connected to the other end of the support member, the A cable wound around the first and second pulleys and a rotatable second rotating mass, the upper end of the structure; And the other of the support, while being connected to the other end of the cable, when the structure is vibrated, the rotational movement of the displacement of the structure to be transmitted through the support member and the cable second rotating mass And a second mass damper for converting into a second mass damper.

According to this arrangement, one end portion of the support member constituted by a pillar is connected to either one (hereinafter referred to as "one site") the support for supporting the upper end portion and the structure of the structure and, first mass damper is the other (hereinafter referred to as "the other site") between the support upper end portions of the structure, and is connected to the other end of the support member. A first pulley is connected to the other part, and a second pulley is attached to the other end of the support member. Further, one end of the cable is connected to the other end of the support member, and the other end is connected to the second mass damper, and the second mass damper is further connected to the other portion.

Claims (6)

A structure damping device for suppressing vibration of a structure supported by a support,
A support member having a column member extending in the vertical direction and having one end connected to one of the upper end of the structure and the support;
A first rotating mass that is rotatable; connected to the other end of the upper end of the structure and the support and the other end of the support member; and when the structure vibrates, A first mass damper that converts a displacement of the structure transmitted through a member into a rotational motion of the first rotary mass;
A first pulley connected to the upper end of the structure and the other of the support;
A second pulley attached to the other end of the support member;
A cable having one end connected to the other end of the support member and wound around the first and second pulleys;
A second rotatable mass that is rotatable and connected to the upper end of the structure, the other of the support and the other end of the cable, and the support when the structure vibrates; A structure damping device comprising: a second mass damper that converts a displacement of the structure transmitted through the member and the cable into a rotational motion of the second rotating mass.   The structure damping device according to claim 1, further comprising a buckling prevention mechanism provided on the structure for preventing buckling of the support member. The buckling prevention mechanism is
A rail that is attached to one of the structure and the support member and that extends in the vertical direction;
The structure according to claim 2, further comprising a slider attached to the other of the structure and the support member, engaged with the rail, and movable only in a length direction of the rail. Vibration damping device. The pillar material is composed of a pair of H-section steels,
The pair of H-section steels are aligned with each other in the horizontal direction along the vertical plane of the structure extending in the vertical direction, and the main surface of one flange of the pair of H-section steels is the vertical plane of the structure. Are arranged in parallel,
The structure damping device according to any one of claims 1 to 3, wherein the support member further includes a beam member connected to the pair of H-shaped steels and extending in a horizontal direction.   A twist prevention mechanism for preventing twisting of the support member by locking a portion of the support member close to the connecting portion of the support member with the first mass damper is provided. The structure damping device according to any one of claims 1 to 4. The one end of the support member is connected to the support;
The first mass damper, the first pulley, and the second mass damper are connected to an upper end portion of the structure,
A guide hole penetrating in the vertical direction is formed in the other end portion of the support member,
The one end of the cable is inserted into the guide hole from above and is located below the guide hole,
A pre-tension is applied to the cable, and a stopper that contacts the other end portion of the support member from below when the structure is not vibrating in order from the upper side to the one end portion of the cable. The structure damping device according to any one of claims 1 to 5, wherein a portion and a weight for applying tension to the cable are attached.

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