Synchronous mass damper device

Abstract

To provide a synchronous mass damper device capable of efficiently reducing vibrations acting on a building.SOLUTION: A synchronous mass damper device 10A that is installed at the top of a building 1 and damps vibrations acting on the building 1, comprises: a weight body 11 provided on the upper side of the building 1; a weight-receiving shaft member 12 which is provided so as to vertically extend between the weight body 11 and the building 1, whose upper end 12t and lower end 12b are pin-connected to the weight body 11 and the building 1 respectively, and which supports the weight body 11 in a manner of being relatively movable in the horizontal direction with respect to the building 1; and a spring body 15 which applies a restoring force to its original position to the weight body 11 when the weight body 11 relatively moves.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a tuned mass damper device that is installed at the top of a building to damp vibrations acting on the building. [Background technology]

[0002] Tuned Mass Damper (TMD) devices are sometimes installed in high-rise buildings to control vibrations. When vibrations occur in the building due to earthquakes, strong winds, etc., a Tuned Mass Damper device reduces the vibrations by applying a force to the building that tries to suppress the building's vibrations by vibrating a weight that is installed so as to be able to move relatively to the building at a period that is in tune with the period of the building's vibration. In this regard, Patent Document 1 discloses a vibration control device for reducing horizontal vibration of a building, which comprises a plate-shaped weight having a rectangular plane, laminated rubber that supports the weight and imparts a horizontal restoring force to the weight, a damping material that imparts a damping force to the horizontal movement of the weight, an auxiliary spring for adjusting the horizontal natural frequency of the weight, and a stopper for preventing excessive displacement and falling off of the weight. Furthermore, Patent Document 2 discloses a vibration control device comprising a plurality of vibration control columns equipped with laminated rubber bodies, a connecting beam connected and erected above the laminated rubber bodies of the plurality of vibration control columns, a weight supported by the connecting beam and installed on the connecting beam, and an oil damper with one end connected to the building and the other end connected to the connecting beam.

[0003] In the configurations of Patent Documents 1 and 2, the load of a weight or other cone acts on a laminated rubber bearing (laminated rubber in Patent Document 1, laminated rubber body in Patent Document 2) as a spring that applies a restoring force to the cone when it moves horizontally relative to the building. When a horizontal force acts on a laminated rubber bearing, it undergoes shear deformation so that its rectangular shape becomes a parallelogram when viewed from the side, but when the applied vertical load becomes large, it undergoes deformation such that the parallelogram shape becomes crushed, and it may not be possible to exhibit the expected rigidity. For this reason, when the load of the cone acts on the laminated rubber bearing as in Patent Documents 1 and 2, the laminated rubber bearing may not be able to fully exhibit the restoring force characteristics that it inherently possesses, and it may not be possible to efficiently reduce vibration. In contrast, Patent Document 3 discloses a tuned mass damper which includes a weight member which is square in plan view and is mounted on the floor surface of a structure via sliding or rolling bearings so as to be freely movable horizontally, and a spring and a damper which are mounted between the floor surface and the four side surfaces of the weight member and are inclined relative to the floor surface in front view, the springs and dampers being each positioned symmetrically with respect to the center line of opposite sides of the weight member in the above plan view, with their upper ends fixed to the side surfaces and their lower ends connected to the floor surface so as to be freely movable in a direction intersecting the extension direction of the springs and dampers.

[0004] In Patent Document 3, the spring as a spring body is structured such that the load of the weight member does not directly act on the spring. However, since the weight member is supported by a rolling bearing so as to be movable horizontally, the load of the weight member acts on this rolling bearing. As a result, a large load acts between the relatively moving members of the rolling bearing, and these members are strongly pressed against each other. Therefore, even if a horizontal load acts on the weight member and the weight member tries to move horizontally, the static friction force between the pressed members increases, and there is a possibility that the members will not easily move relative to each other. In addition, in the structure of Patent Document 3, since the weight member is supported by the rolling bearing as described above, the movable range of the weight member is limited to the range of the size of the rolling bearing. If the movable range of the weight member is not sufficiently secured, the weight member will easily reach the limit of the movable range when vibration occurs in the building. Therefore, even with the configuration of Patent Document 3, there is still a possibility that vibrations of a building cannot be efficiently reduced. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-199356 A [Patent Document 2] JP 2015-227605 A [Patent Document 3] Patent No. 6682393 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a tuned mass damper device that can efficiently reduce vibrations acting on a building. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention employs the following means: That is, the present invention provides a tuned mass damper device that is installed on the top of a building and damps vibrations acting on the building, comprising: a weight-bearing shaft member that is installed vertically between the weight and the building and has an upper end and a lower end that are pin-connected to the weight and the building, respectively, and that supports the weight so that it can move horizontally relative to the building, and a spring that imparts a restoring force to the weight to its original position when the weight moves relative to the building. According to the above-mentioned configuration, when the building vibrates due to an earthquake, strong wind, etc., the weight is caused to move horizontally relative to the building due to inertial force in response to the vibration of the building. The weight is supported by a weight-bearing shaft member extending vertically between the weight and the building, and the upper and lower ends of the weight-bearing shaft member are pin-jointed to the weight and the building. Therefore, the weight-bearing shaft member rotates and tilts relative to both the weight and the building at the pin-jointed portions of the upper and lower ends of the weight-bearing shaft member, allowing the weight to move horizontally relative to the building. When the weight moves horizontally relative to the building in this manner, a force is applied to the weight in a direction returning it to its original position by the spring member that imparts a restoring force to the weight to its original position. As a result, the weight vibrates in sync with the building, reducing the vibration of the building. As described above, the weight-bearing shaft has its upper and lower ends pin-connected to the weight and the building, respectively, and is supported so as to be movable horizontally relative to the building. Therefore, when vibrations occur in the building and the weight attempts to move relative to the building, this relative movement is easily tolerated because the weight-bearing shaft rotates and tilts relative to both the weight and the building at the pin-connected portions of the upper and lower ends of the weight-bearing shaft. Therefore, when vibrations occur, the weight can easily move horizontally. Furthermore, if the weight-bearing shaft is made longer, the amount of movement of the weight when the weight-bearing shaft is tilted increases. Therefore, by making the weight-bearing shaft sufficiently long, it is possible to easily ensure a large horizontal range of movement of the weight. Furthermore, since the weight is basically supported by the weight-bearing shaft material, the load of the weight is prevented from acting on the spring, allowing the spring to fully exert its restoring force characteristics. These effects work synergistically, making it possible to efficiently reduce vibrations acting on buildings.

[0008] In one aspect of the present invention, the spring body is a laminated rubber bearing, the lower side of the spring body is fixed to the building, and a horizontal force transmission body is provided above the spring body to transmit horizontal force between the weight and the upper side of the spring body, the weight is arranged to surround the horizontal force transmission body from the side, and a load transfer suppression mechanism is provided between the side of the horizontal force transmission body and the weight to suppress the transfer of load from the weight to the horizontal force transmission body. According to the above-mentioned configuration, the spring body is a laminated rubber bearing, the lower side of the spring body is fixed to the building, and a horizontal force transmitting body is provided above the spring body to transmit a horizontal force between the weight and the upper side of the spring body, and the weight is provided so as to surround the horizontal force transmitting body from the side. Therefore, when vibration occurs in the building and the weight tries to move horizontally relative to the building, the weight presses the horizontal force transmitting body in the direction of the relative movement, regardless of the direction of the relative movement in the horizontal plane, and the horizontal force transmitting body moves horizontally relative to the building together with the weight. In this way, when the horizontal force transmitting body moves horizontally relative to the building, the spring body, which is a laminated rubber bearing, is sheared in the horizontal direction by moving the upper side together with the horizontal force transmitting body relative to the lower side while the lower side is fixed to the building. The spring body displaces the weight together with the horizontal force transmitting body to the original position, i.e., in the opposite direction to the direction in which the weight tries to move relative to the building, due to its restoring force. In this way, it is possible to efficiently damp and reduce vibrations regardless of the direction of vibrations occurring in the building. In addition, a load transmission suppression mechanism is provided between the side of the horizontal force transmission body and the weight, which suppresses the transmission of load from the weight to the horizontal force transmission body. Therefore, the load of the weight is less likely to act on the laminated rubber bearing as a spring body. In particular, when the building vibrates and the weight-bearing shaft tilts as the weight-bearing shaft moves horizontally relative to the building, the upper end of the weight-bearing shaft tilts in an arc around the lower end, which is pin-joined to the building, causing the weight joined to the upper end to displace slightly downward. In such a case, even if the downward displacement of the weight acts as a downward force on the horizontal force transmitting body, the transmission of this force is suppressed by the load transfer suppression mechanism, which suppresses the transfer of the load from the weight to the horizontal force transmitting body. In this way, the weight of the weight is less likely to act on the spring, and the spring is able to fully exert its restoring force characteristics, making it possible to efficiently damp and reduce the vibration of the building.

[0009] In another aspect of the present invention, the spring body is a spring, the lower end of the spring body is joined between the upper end and the lower end of the weight-bearing shaft material, and the upper end of the spring body is joined to the weight. According to the above-mentioned configuration, the spring body is a spring, and the lower end of the spring body is connected between the upper and lower ends of the weight-bearing shaft material, and the upper end of the spring body is connected to the weight body. Here, since the upper and lower ends of the weight-bearing shaft material are pin-connected to the weight body and the building, respectively, when vibration occurs in the building and the weight body tries to move horizontally relative to the building, the weight-bearing shaft material tilts, and the angle of the weight-bearing shaft material with respect to the weight body changes. As a result, the spring body provided between the weight-bearing shaft material and the weight body contracts or expands. The spring body displaces the weight body to its original position, i.e., in the opposite direction to the direction in which the weight body tries to move relative to the building, by its restoring force. In this way, it is possible to efficiently damp and reduce vibrations. Effect of the Invention

[0010] According to the present invention, it is possible to provide a tuned mass damper device that can efficiently reduce vibrations acting on a building. [Brief description of the drawings]

[0011] [Figure 1]FIG. 1 is a plan view of a tuned mass damper device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a vertical cross-sectional view of the portion viewed from the arrow II in FIG. [Diagram 3] 4 is a graph showing a maximum story deformation angle as a verification result regarding the tuned mass damper device of the first embodiment. [Figure 4] 4 is a graph showing maximum response acceleration as a verification result regarding the tuned mass damper device of the first embodiment. [Diagram 5] FIG. 11 is a front view of a tuned mass damper device according to a modified example of the first embodiment. [Figure 6] FIG. 11 is a plan view of the tuned mass damper device according to the modified example. [Figure 7] FIG. 11 is a front view of a tuned mass damper device according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a plan view of the tuned mass damper device in the second embodiment. [Figure 9] 11A and 11B are a plan view and a front view of a tuned mass damper device according to another modified example of the above embodiments and the modified examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] This invention is a tuned mass damper device that is installed on the top of a building to damp vibrations acting on the building, and is composed of a weight-bearing shaft member that has pin supports at the top and bottom and supports the weight so that it can move freely relative to the building in the horizontal direction, and a spring body that imparts a restoring force to the weight to its original position. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. [First embodiment] Fig. 1 is a plan view of a tuned mass damper device according to the present embodiment, and Fig. 2 is a vertical cross-sectional view of the portion viewed from the arrow II in Fig. 1. The tuned mass damper device 10A is provided, for example, on the top of a mid-rise or high-rise building 1. The tuned mass damper device 10A may be provided on a slab 1a constituting the roof of the building 1. Alternatively, the tuned mass damper device 10A may be provided on a story located at the top of the building 1, for example, indoors on the top floor below the roof, on the slab 1a constituting the top floor. When vibrations occur in the building due to an earthquake, strong winds, or the like, the tuned mass damper device 10A reduces the vibrations by applying a force to the building that suppresses the vibrations of the building by vibrating a weight that is provided to be movable relative to the building with a period that is in tune with the period of the vibration of the building. The tuned mass damper device 10A includes a weight body 11, a weight-bearing shaft member 12, a horizontal force transmitting body 13, a load transmission suppressing mechanism 14, a spring body 15, and a damper 16.

[0013] The weight 11 is provided above the building 1. The weight 11 is provided above the slab 1a of the building 1 and spaced apart from the slab 1a. The mass of the weight 11 is set so as to effectively damp vibrations acting on the building 1 when an earthquake occurs. The weight 11 is formed to have a mass that is, for example, about 1 / 100 of the total weight of the building 1. In this embodiment, the cone 11 has four vertices 11c and is formed to have a rectangular shape when viewed in a plan view. The shape of the cone 11 is not limited to a rectangle, and may be a polygonal shape having a number of vertices 11c other than four. Alternatively, the cone 11 may be another shape different from a polygonal shape, such as a circle. The weight 11 is made of metal, concrete, or the like, and may be a hollow container into which a liquid such as water has been poured. In this embodiment, the cone 11 is formed such that the lower surface 11d in the vicinity of the apex 11c is located higher than the lower surface 11b of the other portions including the central portion. A rectangular through-hole 11h is provided in the center of the weight 11 so as to penetrate the weight 11 in the up-down direction.

[0014] The weight-bearing shaft member 12 is provided between the slab 1a of the building 1 and the underside 11d at the apex 11c of the weight body 11. The weight-bearing shaft member 12 supports the weight body 11 so as to be movable horizontally relative to the building 1. The weight-bearing shaft member 12 is a long member provided between the weight body 11 and the building 1 and extending in the vertical direction. Four or more weight-bearing shaft members 12 are attached. In this embodiment, four weight-bearing shaft members 12 are provided corresponding to the apexes 11c of the weight body 11, respectively. The lower end 12b of the weight-bearing shaft member 12 is joined to the slab 1a of the building 1. The weight-bearing shaft member 12 is pin-joined to the slab 1a of the building 1 so as to be tiltable in each of a first direction D1 and a second direction D2 that are perpendicular to each other in a horizontal plane. In other words, the weight-bearing shaft member 12 is pin-joined to the slab 1a of the building 1 so as to be rotatable in two directions. As a result, the weight-bearing shaft member 12 is provided so as to be tiltable in all directions of 360° relative to the slab 1a of the building 1. An upper end 12t of the weight-bearing shaft member 12 is joined to the lower surface 11d of the weight body 11. The weight-bearing shaft member 12 is pin-joined to the lower surface 11d of the weight body 11 so as to be tiltable in each of a first direction D1 and a second direction D2 that are perpendicular to each other in a horizontal plane. In other words, the weight-bearing shaft member 12 is pin-joined to the lower surface 11d of the weight body 11 so as to be rotatable in two directions. As a result, the weight-bearing shaft member 12 is provided so as to be tiltable in all directions of 360° with respect to the lower surface 11d of the weight body 11. In this way, each of the upper end 12t and lower end 12b of the weight-bearing shaft material 12 is pin-joined to the weight body 11 and the building 1 so as to rotate in each of a first direction D1 and a second direction D2 that are perpendicular to each other in a horizontal plane, i.e., so as to be rotatable in two directions.

[0015] The horizontal force transmission body 13 transmits a horizontal force between the weight 11 and the upper side of the spring body 15, as described later. The horizontal force transmission body 13 is provided in the center of the tuned mass damper device 10A when viewed from above. The horizontal force transmission body 13 is formed to be a block body having a substantially cubic shape. When viewed from above, the horizontal force transmission body 13 is formed to be larger than the spring body 15, which will be described later. When viewed from above, the horizontal force transmission body 13 is formed to be shaped to correspond to the through hole 11h of the weight 11 and to be slightly smaller than the through hole 11h. The horizontal force transmission body 13 is provided inside the through hole 11h. In this way, the weight 11 is provided to surround the horizontal force transmission body 13 from the side.

[0016] A gap S is provided between each of the side surfaces 13s of the horizontal force transmission body 13 and a wall surface that faces each of the side surfaces 13s and forms the through hole 11h of the weight 11. A load transmission suppression mechanism 14 is provided in this gap S. The load transfer suppressing mechanism 14 suppresses the transfer of load from the weight 11 to the horizontal force transmitting body 13 by allowing the horizontal force transmitting body 13 and the weight 11 to move relatively in the vertical direction. The load transfer suppressing mechanism 14 is provided on each side surface 13s of the horizontal force transmitting body 13. A plurality of the load transfer suppressing mechanisms 14 are provided at intervals in the vertical and horizontal directions. In this embodiment, the load transfer suppressing mechanism 14 is, for example, a roller formed in a spherical shape. The load transfer suppressing mechanism 14 may be formed by, for example, positioning a roller formed in a cylindrical shape so that the axial direction extends within a horizontal plane. The load transfer suppressing mechanism 14 is provided in contact with each of the side surface 13s of the horizontal force transmitting body 13 and the wall surface of the through hole 11h.

[0017] The spring body 15 is provided below the horizontal force transmission body 13. The spring body 15 is provided on the slab 1a of the building 1 and supports the horizontal force transmission body 13. In this embodiment, the spring body 15 is a laminated rubber bearing. The spring body 15 includes a lower laminated rubber bearing 15A located on the lower side and an upper laminated rubber bearing 15B located on the upper side, and is formed by stacking the lower laminated rubber bearing 15A and the upper laminated rubber bearing 15B in two stages, one above the other. Each of the lower laminated rubber bearing 15A and the upper laminated rubber bearing 15B includes a lower flange plate 15a, an upper flange plate 15b, and a laminated rubber portion 15c interposed between the lower flange plate 15a and the upper flange plate 15b. The lower flange plate 15a of the lower laminated rubber bearing 15A is fixed to the upper end surface 2a of the base 2, which is formed so that the slab 1a of the building 1 protrudes upward. The upper flange plate 15b of the lower laminated rubber bearing 15A and the lower flange plate 15a of the upper laminated rubber bearing 15B are fixed to each other. The upper flange plate 15b of the upper laminated rubber bearing 15B is fixed to the lower surface 13b of the horizontal force transmission body 13. In this way, the lower side of the spring body 15 is fixed to the building 1, and the horizontal force transmission body 13 is provided above the spring body 15 and fixed to the spring body 15. The laminated rubber portion 15c is formed by laminating metal plates and viscoelastic layers (rubber layers) alternately in the vertical direction.

[0018] As will be described later, the weight 11 moves horizontally relative to the building 1, and the horizontal force transmission body 13 moves horizontally together with the weight 11, so that a horizontal force acts on the upper side of the spring body 15. In this case, the laminated rubber part 15c, which has a rectangular shape when viewed from the side as shown in Fig. 2, undergoes shear deformation to become a parallelogram, but if the vertical load acting on the laminated rubber part 15c becomes large, the parallelogram shape is deformed to a crushed shape, and the expected rigidity may not be achieved. For this reason, it is desirable to make the horizontal force transmission body 13 as light as possible. For example, in the case where horizontal force transmission body 13 is formed to have a size slightly larger than spring body 15 when viewed in a plan view as shown in Fig. 1, horizontal force transmission body 13 may be formed of the same material as weight body 11. However, it is more preferable to form horizontal force transmission body 13 as a frame structure made of steel or the like to reduce the mass.

[0019] The damper 16 is provided between the building 1 and the horizontal force transmission body 13. The damper 16 is, for example, an oil damper. When the weight 11 moves together with the horizontal force transmission body 13 relative to the building 1 in the horizontal direction and vibrates, the damper 16 damps the vibration. In this embodiment, four dampers 16 are provided. More dampers 16 may be provided. In a plan view, a damper mounting member 16c is provided at the midpoint of the outer side surface 11e connecting the vertices 11c of the weight body 11 so as to rise upward from the slab 1a of the building 1. Each damper mounting member 16c is provided between two adjacent weight-bearing shaft members 12 on each outer side surface 11e of the weight body 11. One end 16a of each damper 16 is pin-joined to the side surface 13s of the horizontal force transmission body 13, and the other end 16b is pin-joined to the damper mounting member 16c. In this way, when viewed in a plane, the damper 16 is arranged so as to extend radially outward from the center at a predetermined angle in the circumferential direction, centered on the spring body 15 and the horizontal force transmission body 13.

[0020] In the above-mentioned configuration, when the building vibrates due to an earthquake, strong wind, or the like, the weight 11 tries to move horizontally relative to the building 1 due to the inertial force that tries to keep the weight 11 in place. Here, since the weight 11 is supported by four or more weight-bearing shaft members 12, the above-mentioned relative movement is allowed by the weight-bearing shaft members 12 trying to tilt in the same direction, and as a result, even if the weight 11 moves relative to the building 1, the posture of the weight 11 relative to the building 1 is maintained. In addition, the upper end 12t and the lower end 12b of the weight-bearing shaft member 12 are pin-connected to the weight 11 and the building 1. Therefore, when vibration occurs in the building 1 and the weight 11 tries to move relative to the building 1, this relative movement is easily allowed by the weight-bearing shaft member 12 rotating and tilting with respect to both the weight 11 and the building 1 at the pin-connected parts of the upper end 12t and the lower end of the weight-bearing shaft member 12. In addition, the upper end 12t and the lower end 12b of the weight-bearing shaft member 12 are pin-connected so as to be rotatable in two directions, so that the relative movement of the weight body 11 in any direction in the horizontal plane is permitted. Therefore, when vibration occurs, the weight body 11 can easily move relative to the building 1 in the horizontal direction.

[0021] As described above, when weight 11 moves horizontally relative to building 1, the wall surface of through hole 11h of weight 11 presses horizontal force transmission body 13 via load transfer suppression mechanism 14, transmitting the horizontal force to horizontal force transmission body 13. Since weight 11 is provided so as to surround horizontal force transmission body 13 from the sides, weight 11 presses horizontal force transmission body 13 in any direction in the horizontal plane of relative movement of weight 11 relative to building 1. In this way, horizontal force transmission body 13 also moves horizontally relative to building 1 together with weight 11. This relative horizontal movement of the horizontal force transmission body 13 causes the upper side of the spring body 15, which is made of laminated rubber bearings 15A, 15B whose lower side is fixed to the building 1, to move relative to the lower side together with the horizontal force transmission body 13. In this way, the horizontal force transmission body 13 transmits horizontal force between the weight body 11 and the upper side of the spring body 15. When the horizontal force is transmitted to the upper side of the spring body 15, the spring body 15 undergoes horizontal shear deformation. The spring body 15, together with the horizontal force transmission body 13, displaces the weight body 11 in a direction opposite to the direction in which the weight body 11 was attempting to move relatively, returning to its original position, due to its restoring force. In this way, the weight body 11 vibrates in harmony with the building 1.

[0022] At this time, both ends 16a, 16b of the damper 16 are pin-connected to the horizontal force transmission body 13 and the damper mounting member 16c, and the damper 16 can easily change its position relative to the horizontal force transmission body 13. Therefore, the damper 16 does not impede the relative movement of the weight body 11 with respect to the building 1 as described above. Furthermore, in plan view, the dampers 16 are provided so as to extend radially outward from the center at a predetermined angle in the circumferential direction, centered on the spring body 15 and the horizontal force transmission body 13. In this way, the dampers 16 are provided so as to face various directions in the horizontal plane, so that vibrations are efficiently damped regardless of the direction of relative movement of the weight body 11 with respect to the building 1 in the horizontal plane. In this way, vibrations of the building 1 are reduced.

[0023] Here, a load transfer suppression mechanism 14 is provided between the weight 11 and the horizontal force transmission body 13 to suppress the transfer of load from the weight 11 to the horizontal force transmission body 13. As a result, the load of the weight 11 is supported mainly by the weight-bearing shaft material 12 and is unlikely to act on the horizontal force transmission body 13. Therefore, the load of the horizontal force transmission body 13 mainly acts on the spring body 15. Also, the mass of the horizontal force transmission body 13 can be reduced by forming it as a frame structure made of, for example, steel material or the like. In particular, when vibrations occur in the building 1 and the weight-bearing shaft member 12 tilts as the weight-bearing shaft member 12 moves horizontally relative to the building 1, the upper end 12t of the weight-bearing shaft member 12 tilts in an arc around the part of the lower end 12b that is pin-joined to the building 1, so that the weight-bearing shaft member 12 moves slightly downward. In such a case, even if the downward displacement of the weight 11 causes a downward force to act as a load on the horizontal force transmitting body 13, the transmission of this force is suppressed by the weight 11 moving vertically relative to the horizontal force transmitting body 13 via the load transfer suppressing mechanism 14. In this way, the load of the weight 11 is unlikely to act on the spring body 15, and the spring body 15 is structured to be able to fully exert its restoring force characteristics. Therefore, it is possible to efficiently damp and reduce the vibration of the building 1.

[0024] The above-mentioned tuned mass damper device 10A is installed on the top of a building 1 and damps vibrations acting on the building 1, and comprises: a weight-bearing shaft member 12 extending vertically between the weight body 11 and the building 1, with an upper end 12t and a lower end 12b pin-joined to the weight body 11 and the building 1, respectively, supporting the weight body 11 so as to be freely movable horizontally relative to the building 1; and a spring body 15 that imparts a restoring force to the weight body 11 to its original position when the weight body 11 moves relative to the building 1. According to the above-mentioned configuration, when the building 1 vibrates due to an earthquake, strong wind, or the like, the weight 11 tends to move horizontally relative to the building 1 due to the inertial force in response to the vibration of the building 1. The weight 11 is supported by a weight bearing shaft 12 extending vertically between the weight 11 and the building 1, and the upper end 12t and the lower end 12b of the weight bearing shaft 12 are pin-joined to the weight 11 and the building 1. For this reason, the weight bearing shaft 12 rotates and tilts relative to both the weight 11 and the building 1 at the pin-joined portion of the upper end 12t and the lower end 12b of the weight bearing shaft 12, and this is permitted. When the weight 11 moves horizontally relative to the building 1 in this manner, a force in the direction of returning the weight 11 to its original position is applied to the weight 11 by the spring 15 that imparts a restoring force to the weight 11 to its original position. This causes the weight 11 to vibrate in unison with the building 1, reducing the vibration of the building 1. As described above, the weight-bearing shaft 12 has its upper end 12t and lower end 12b pin-joined to the weight-bearing shaft 11 and the building 1, respectively, so that the weight-bearing shaft 12 is supported so as to be movable horizontally relative to the building 1. Therefore, when vibrations occur in the building 1 and the weight-bearing shaft 11 attempts to move relative to the building 1, this relative movement is easily tolerated because the weight-bearing shaft 12 rotates and tilts relative to both the weight-bearing shaft 11 and the building 1 at the pin-joined portions of the weight-bearing shaft 12, the upper end 12t and the lower end 12b of the weight-bearing shaft 12. Therefore, when vibrations occur, the weight-bearing shaft 11 can easily move horizontally. Furthermore, if the weight-bearing shaft material 12 is made longer, the amount of movement of the weight body 11 increases when the weight-bearing shaft material 12 is tilted. Therefore, by making the weight-bearing shaft material 12 sufficiently long, it is possible to easily ensure a large horizontal movable range of the weight body 11. Furthermore, since weight body 11 is basically supported by weight-bearing shaft material 12, the load of weight body 11 is prevented from acting on spring body 15. This allows spring body 15 to fully exert its restoring force characteristics. These effects work synergistically, making it possible to efficiently reduce the vibrations acting on the building 1.

[0025] In addition, the spring body 15 is a laminated rubber bearing, and the underside of the spring body 15 is fixed to the building 1. A horizontal force transmission body 13 is provided above the spring body 15 to transmit horizontal force between the weight body 11 and the upper side of the spring body 15. The weight body 11 is arranged so as to surround the horizontal force transmission body 13 from the side. A load transfer suppression mechanism 14 is provided between the side surface 13s of the horizontal force transmission body 13 and the weight body 11 to suppress the transfer of load from the weight body 11 to the horizontal force transmission body 13. According to the above-mentioned configuration, the spring body 15 is the laminated rubber bearing 15A, 15B, the lower side of the spring body 15 is fixed to the building 1, the horizontal force transmission body 13 that transmits horizontal force between the weight body 11 and the upper side of the spring body 15 is provided above the spring body 15, and the weight body 11 is provided so as to surround the horizontal force transmission body 13 from the side. Therefore, when the building 1 vibrates and the weight body 11 tries to move horizontally relative to the building 1, the weight body 11 presses the horizontal force transmission body 13 in the direction of the relative movement, regardless of the direction of the relative movement in the horizontal plane, and the horizontal force transmission body 13 moves horizontally relative to the building 1 together with the weight body 11. In this way, when the horizontal force transmission body 13 moves horizontally relative to the building 1, the spring body 15, which is the laminated rubber bearing 15A, 15B, is sheared in the horizontal direction by moving the upper side together with the horizontal force transmission body 13 relative to the lower side while the lower side is fixed to the building 1. The spring body 15, by its restoring force, displaces the weight body 11 together with the horizontal force transmission body 13 back to the original position, i.e., in the direction opposite to the direction in which the weight body 11 was attempting to move relative to the horizontal force transmission body 13. In this way, it is possible to efficiently damp and reduce vibrations generated in the building 1, regardless of the direction of the vibrations. In addition, a load transmission suppression mechanism 14 that suppresses the transmission of load from the weight 11 to the horizontal force transmission body 13 is provided between the side surface 13s of the horizontal force transmission body 13 and the weight 11. Therefore, the load of the weight 11 is unlikely to act on the laminated rubber bearings 15A and 15B serving as the spring body 15. In particular, when vibrations occur in the building 1 and the weight-bearing shaft 12 tilts as the weight-bearing shaft 12 moves horizontally relative to the building 1, the upper end 12t of the weight-bearing shaft 12 tilts in an arc around the part of the lower end that is pin-joined to the building 1, so that the weight 11 joined to the upper end 12t is slightly displaced downward. In such a case, even if the downward displacement of the weight 11 acts as a downward force on the horizontal force transmitting body 13, the transmission of this force is suppressed by the load transfer suppressing mechanism 14, which suppresses the transfer of the load from the weight 11 to the horizontal force transmitting body 13. In this way, the load of the weight 11 is unlikely to act on the spring body 15, and the spring body 15 is structured to be able to fully exert its restoring force characteristics. Therefore, it is possible to efficiently damp and reduce the vibration of the building 1.

[0026] In addition, each of the upper end 12t and the lower end 12b of the weight-bearing shaft material 12 is pin-joined to the weight body 11 and the building 1 so as to rotate in each of a first direction D1 and a second direction D2 that are perpendicular to each other in a horizontal plane. With this configuration, the weight-bearing shaft material 12 can tilt in all directions of 360° relative to each of the slab 1a of the building 1 and the weight body 11, so that the configuration can allow relative movement of the weight body 11 in any horizontal direction relative to the building 1.

[0027] Moreover, four or more weight-bearing shaft members 12 are attached. According to this configuration, the weight-bearing shaft material 12 can support the weight 11 in a well-balanced manner. Furthermore, when vibrations occur in the building 1 and the weight 11 moves relative to the building 1, the attitude of the weight 11 can be maintained.

[0028] Moreover, the horizontal force transmitting body 13 is a frame structure formed of steel material. With this configuration, the mass of the horizontal force transmission body 13 can be reduced, thereby reducing the load acting on the spring body 15. This allows the spring body 15 to fully exert its restoring force characteristics, making it possible to efficiently damp and reduce the vibration of the building 1.

[0029] [Verification example of the first embodiment] Next, verification of the tuned mass damper device 10A of the first embodiment as described above and the results thereof will be described. A tuned mass damper device 10A as described as the first embodiment was installed at the top of a 16-story steel-framed building 1. The dimensions of each side of the building 1 in plan view were 36 m and 24 m, respectively. The first floor had a height of 6 m, and each floor from the second floor onwards had a height of 4 m, resulting in a total height of the building 1 of 66 m. The weight of each floor was 691 tons, resulting in a total weight of the building 1 of 11,059 tons. In contrast, the mass of weight 11 of tuned mass damper device 10A is set to 100 tons, which is approximately 1 / 100 of the weight of building 1. Laminated rubber bearings 15A and 15B serving as spring body 15 have laminated rubber portion 15c with a diameter of 1000 mm, allowing an overall deformation of 1250 mm.

[0030] The El Centro, Taft, Hachinohe, and Kobe earthquake waves were input to a building 1 (embodiment) equipped with such a tuned mass damper device 10A and a building 1 (comparison example) not equipped with the tuned mass damper device 10A. Figure 3 is a graph showing the maximum story drift angle in the examples and comparative examples. Figure 4 is a graph showing the maximum response acceleration in the examples and comparative examples. In both Figures 3 and 4, the results of the comparative examples are shown by dashed lines and the results of the examples are shown by solid lines. As shown in Figs. 3 and 4, the maximum story drift angle and maximum response acceleration were reduced more significantly in the example including the tuned mass damper device 10A described as the first embodiment than in the comparative example.

[0031] [Modification of the first embodiment] In the above embodiment, the horizontal force transmission body 13 and the spring body 15 are provided in the central part of the weight body 11 when viewed in a plane, and the weight-bearing shaft material 12 is provided at each of the vertices 11c of the weight body 11, but this is not limited to the above. Fig. 5 is a front view of the tuned mass damper device according to this modified example, and Fig. 6 is a plan view of the tuned mass damper device according to this modified example. As shown in Figures 5 and 6 as a tuned mass damper device 10B of this modified example, the weight-bearing shaft member 12 may be provided on the central side of the weight body 11. Also, the horizontal force transmission body 13 and the spring body 15 may be provided on the outer side of the weight-bearing shaft member 12. The number of horizontal force transmission body 13 and spring body 15 is not limited to one, and may be two or more as shown in Figures 5 and 6. 5 and 6 do not show the damper 16. The dampers 16 may be installed in any manner as long as a plurality of dampers 16 are provided so as to face various directions in a horizontal plane as in the above embodiment.

[0032] [Another Modification of the First Embodiment] In the above embodiment, the load transfer suppression mechanism 14 was a roller provided in contact with each of the weight 11 and the horizontal force transmission body 13, but the load transfer suppression mechanism 14 may have any structure as long as it has a structure that suppresses the transfer of load from the weight 11 to the horizontal force transmission body 13 by allowing the horizontal force transmission body 13 and the weight 11 to move freely relative to each other in the vertical direction. For example, the load transfer suppression mechanism 14 may have a structure including a guide rail joined to one of the weight 11 and the horizontal force transmitting body 13 so as to extend in the vertical direction, and a guided part provided movably on the guide rail and joined to the other of the weight 11 and the horizontal force transmitting body 13. In such a configuration, even if a load is to be transferred from the horizontal force transmitting body 13 to the weight 11, the guided part moves relative to the guide rail, thereby suppressing the transfer of the load.

[0033] [Second embodiment] Next, a second embodiment will be described. Fig. 7 is a front view of a tuned mass damper device in this embodiment. Fig. 8 is a plan view of the tuned mass damper device in this embodiment. The tuned mass damper device 10C of the second embodiment differs from the tuned mass damper device 10A of the first embodiment in the shape of the weight 11, the presence or absence of a horizontal force transmission body 13, and the structure of the spring body 15. Other than that, the second embodiment has the same structure as the first embodiment, so a description thereof will be omitted.

[0034] In this embodiment, the spring body 25 is not a lower laminated rubber bearing, but a spring provided between the weight weight 11 and the weight-bearing shaft member 12. For this reason, the tuned mass damper device 10C of this embodiment does not include the laminated rubber bearings 15A, 15B and the horizontal force transmission body 13 provided on the laminated rubber bearings 15A, 15B in the first embodiment. Therefore, the weight weight 11 does not have a through hole 11h for providing the horizontal force transmission body 13.

[0035] The lower end 25b of the spring serving as the spring body 25 is joined between the upper end 25t and the lower end 25b of the weight-bearing shaft material 12. In this embodiment, the lower end 25b of the spring body 25 is joined to the weight-bearing shaft material 12 at a position above the center of the weight-bearing shaft material 12. The upper end 25t of the spring body 25 is joined to the lower surface 11b of the weight weight body 11. In this manner, the spring body 25 is provided so as to extend obliquely between the weight weight body 11 and the weight-bearing shaft material 12. In this embodiment, two spring bodies 25 are provided for each weight-bearing shaft material 12. As shown in Fig. 8, one of the two spring bodies 25 is provided for each weight-bearing shaft material 12 so as to extend in the first direction D1 toward the other weight-bearing shaft material 12 located at the apex 11c on the opposite side in the first direction D1 when viewed in a plane. The other of the two spring bodies 25 is provided for each weight-bearing shaft material 12 so as to extend in the second direction D2 toward the other weight-bearing shaft material 12 located at the apex 11c on the opposite side in the second direction D2 when viewed in a plane.

[0036] In the above-mentioned configuration, when the building vibrates due to an earthquake, strong wind, or the like, the weight 11 tries to move horizontally relative to the building 1 due to the inertial force that tries to keep the weight 11 in place. Here, since the weight 11 is supported by four or more weight-bearing shaft members 12, the above-mentioned relative movement is allowed by the weight-bearing shaft members 12 trying to tilt in the same direction, and as a result, even if the weight 11 moves relative to the building 1, the posture of the weight 11 relative to the building 1 is maintained. In addition, the upper end 12t and the lower end 12b of the weight-bearing shaft member 12 are pin-connected to the weight 11 and the building 1. Therefore, when vibration occurs in the building 1 and the weight 11 tries to move relative to the building 1, this relative movement is easily allowed by the weight-bearing shaft member 12 rotating and tilting with respect to both the weight 11 and the building 1 at the pin-connected parts of the upper end 12t and the lower end of the weight-bearing shaft member 12. In addition, the upper end 12t and the lower end 12b of the weight-bearing shaft member 12 are pin-connected so as to be rotatable in two directions, so that the relative movement of the weight body 11 in any direction in the horizontal plane is permitted. Therefore, when vibration occurs, the weight body 11 can easily move relative to the building 1 in the horizontal direction.

[0037] As described above, when weight body 11 attempts to move horizontally relative to building 1, the angle of weight-bearing shaft member 12 with respect to weight body 11 changes. This causes spring body 25, i.e., a spring, provided between weight-bearing shaft member 12 and weight body 11 to contract or expand. The restoring force of spring body 25 displaces weight body 11 in a direction opposite to the direction in which weight body 11 attempts to move relative to the original position. In this way, it is possible to efficiently damp and reduce vibrations.

[0038] 7 and 8 do not show the dampers 16. The dampers 16 may be installed in any manner as long as a plurality of dampers 16 are provided so as to face various directions in a horizontal plane as in the above embodiment.

[0039] The above-mentioned tuned mass damper device 10C is installed at the top of a building 1 and damps vibrations acting on the building 1, and comprises a weight-bearing shaft member 12 extending vertically between the weight body 11 and the building 1, with an upper end 12t and a lower end 12b pin-joined to the weight body 11 and the building 1, respectively, supporting the weight body 11 so as to be freely movable horizontally relative to the building 1, and a spring body 25 that imparts a restoring force to the weight body 11 to its original position when the weight body 11 moves relative to the building 1. According to the above-mentioned configuration, when the building 1 vibrates due to an earthquake, strong wind, or the like, the weight 11 tends to move horizontally relative to the building 1 due to the inertial force in response to the vibration of the building 1. The weight 11 is supported by a weight bearing shaft 12 extending vertically between the weight 11 and the building 1, and the upper end 12t and the lower end 12b of the weight bearing shaft 12 are pin-joined to the weight 11 and the building 1. For this reason, the weight bearing shaft 12 rotates and tilts relative to both the weight 11 and the building 1 at the pin-joined portion of the upper end 12t and the lower end 12b of the weight bearing shaft 12, and this is permitted. When the weight 11 moves horizontally relative to the building 1 in this manner, a force in the direction of returning the weight 11 to its original position is applied to the weight 11 by the spring 15 that imparts a restoring force to the weight 11 to its original position. This causes the weight 11 to vibrate in unison with the building 1, reducing the vibration of the building 1. As described above, the weight-bearing shaft 12 has its upper end 12t and lower end 12b pin-joined to the weight-bearing shaft 11 and the building 1, respectively, so that the weight-bearing shaft 12 is supported so as to be movable horizontally relative to the building 1. Therefore, when vibrations occur in the building 1 and the weight-bearing shaft 11 attempts to move relative to the building 1, this relative movement is easily tolerated because the weight-bearing shaft 12 rotates and tilts relative to both the weight-bearing shaft 11 and the building 1 at the pin-joined portions of the weight-bearing shaft 12, the upper end 12t and the lower end 12b of the weight-bearing shaft 12. Therefore, when vibrations occur, the weight-bearing shaft 11 can easily move horizontally. Furthermore, if the weight-bearing shaft material 12 is made longer, the amount of movement of the weight body 11 increases when the weight-bearing shaft material 12 is tilted. Therefore, by making the weight-bearing shaft material 12 sufficiently long, it is possible to easily ensure a large horizontal movable range of the weight body 11. Furthermore, since weight body 11 is basically supported by weight-bearing shaft material 12, the load of weight body 11 is prevented from acting on spring body 15. This allows spring body 15 to fully exert its restoring force characteristics. These effects work synergistically, making it possible to efficiently reduce the vibrations acting on the building 1.

[0040] The spring body 25 is a spring, and a lower end 25b of the spring body 25 is joined between the upper end 12t and the lower end 12b of the weight-bearing shaft material 12, and an upper end 25t of the spring body 25 is joined to the weight body 11. According to the above-mentioned configuration, the spring body 25 is a spring, and the lower end 25b of the spring body 25 is joined between the upper end 12t and the lower end 12b of the weight-bearing shaft member 12, and the upper end 25t of the spring body 25 is joined to the weight body 11. Here, the upper end 12t and the lower end 12b of the weight-bearing shaft member 12 are pin-joined to the weight body 11 and the building 1, respectively. Therefore, when vibration occurs in the building 1 and the weight body 11 tries to move relatively to the building 1 in the horizontal direction, the weight-bearing shaft member 12 tilts, and the angle of the weight-bearing shaft member 12 with respect to the weight body 11 changes. As a result, the spring body 25 provided between the weight-bearing shaft member 12 and the weight body 11 contracts or expands. The spring body 25 displaces the weight body 11 to its original position, that is, in the opposite direction to the direction in which the weight body 11 tries to move relatively, by its restoring force. In this way, it is possible to efficiently damp and reduce vibration.

[0041] In addition, each of the upper end 12t and the lower end 12b of the weight-bearing shaft material 12 is pin-joined to the weight body 11 and the building 1 so as to rotate in each of a first direction D1 and a second direction D2 that are perpendicular to each other in a horizontal plane. With this configuration, the weight-bearing shaft material 12 can tilt in all directions of 360° relative to each of the slab 1a of the building 1 and the weight body 11, so that the configuration can allow relative movement of the weight body 11 in any horizontal direction relative to the building 1.

[0042] Moreover, four or more weight-bearing shaft members 12 are attached. According to this configuration, the weight-bearing shaft material 12 can support the weight 11 in a well-balanced manner. Furthermore, when vibrations occur in the building 1 and the weight 11 moves relative to the building 1, the attitude of the weight 11 can be maintained.

[0043] [Modification of the second embodiment] In the configuration of the second embodiment, when the vibration acting on the building 1 is very large, the relative movement of the weight body 11 with respect to the building 1 becomes large, causing the weight-bearing shaft material 12 to tilt significantly, and if the extension limit of the spring body 25 is exceeded, the spring body 25 may be damaged. In order to suppress this, for example, a stopper may be provided on the side of the weight body 11 at a position separated from the weight body 11 so as to surround the weight body 11, thereby suppressing the relative movement of the weight body 11 beyond a certain amount.

[0044] The tuned mass damper device of the present invention is not limited to the above-described embodiments and modifications, which have been described with reference to the drawings, and various other modifications are possible within the technical scope of the present invention. For example, the first embodiment may be combined with the second embodiment, so that the tuned mass damper device has, as the spring body 15, both the laminated rubber bearings 15A and 15B and a spring (spring body 25). That is, the spring body comprises laminated rubber bearings 15A, 15B and a spring (spring body 25), the lower sides of the laminated rubber bearings 15A, 15B are fixed to the building 1, a horizontal force transmission body 13 that transmits horizontal force between the weight body 11 and the upper sides of the laminated rubber bearings 15A, 15B is provided above the laminated rubber bearings 15A, 15B, the weight body 11 is provided so as to surround the horizontal force transmission body 13 from the side, a load transfer suppression mechanism 14 that suppresses the transfer of load from the weight body 11 to the horizontal force transmission body 13 is provided between the side surface 13s of the horizontal force transmission body 13 and the weight body 11, the lower end 25b of the spring (spring body 25) is joined between the upper end 12t and lower end 12b of the weight-bearing shaft material 12, and the upper end 12t of the spring (spring body 25) is joined to the weight body 11, so as to configure a tuned mass damper device.

[0045] In addition, in each of the above embodiments and modified examples, the weight 11 is provided above the slab 1a of the building 1 and spaced apart from the slab 1a, and is made of metal, concrete, or a hollow container filled with liquid, but this is not limited to this. FIG. 9 shows a plan view and a front view of the tuned mass damper device in this modified example. 9, a part of a slab (e.g., a floor slab) 1b constituting a building may be cut vertically so as to have a rectangular shape in plan view, and the cut part of the slab 1b having a rectangular parallelepiped shape may be used as the weight 11. In this case, a tuned mass damper device 10D is installed between a lower slab (e.g., a floor slab) 1a and the cut slab 1b located above. In this case, it is preferable to create a gap S1 between the cone 11 and the slab 1b by locating the cone 11 horizontally away from the surrounding slab 1b by the amount of expected relative movement of the cone 11. It is also preferable to install an expansion joint 20 between the surrounding slab 1b and the rectangular parallelepiped slab, i.e., the cone 11, so as to span the gap S1 across the top surfaces of the cone 11 and the slab 1b. In addition, it is possible to select and discard the configurations given in the above embodiments and modifications, or to change them to other configurations as appropriate. [Explanation of symbols]

[0046] 1 Building 14 Load transfer suppression mechanism 10A~10D Tuned mass damper device 15, 25 Spring body 11 Weight 15A Lower laminated rubber bearing (laminated rubber bearing) 12 Weight bearing shaft material 15B Upper laminated rubber bearing (laminated rubber bearing) 12t top 16 dumper 12b Lower end 25b Lower end of spring body 13 Horizontal force transmission body 25t Upper end of spring body (spring) 13s side

Claims

1. A tuned mass damper device installed at the top of a building to damp vibrations acting on the building, comprising: A cone provided above the building; a weight-bearing shaft member that is provided between the weight body and the building and extends in a vertical direction, and has an upper end and a lower end that are pin-connected to the weight body and the building, respectively, and supports the weight body so as to be movable relative to the building in a horizontal direction; a spring body that applies a restoring force to the weight body to its original position when the weight body moves relatively; 1. A tuned mass damper device comprising:

2. The spring body is a laminated rubber bearing, A lower side of the spring body is fixed to the building, and a horizontal force transmission body is provided above the spring body to transmit a horizontal force between the weight body and the upper side of the spring body, The weight is provided so as to laterally surround the horizontal force transmitting body, A load transmission suppressing mechanism is provided between the side surface of the horizontal force transmitting body and the weight, which suppresses the transmission of load from the weight to the horizontal force transmitting body.

2. The tuned mass damper device of claim 1.

3. The spring body is a spring, The lower end of the spring body is joined between the upper end and the lower end of the weight-bearing shaft material, and the upper end of the spring body is joined to the weight body.

2. The tuned mass damper device of claim 1.

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