Vibration damping structure of building framework

Abstract

To provide a damping structure of a building frame capable of suppressing effectively twisting that occurs on a building frame while efficiently suppressing vibration against input vibration to the building frame.SOLUTION: The damping structure is a structure for suppressing vibration against input vibration to a building frame 1 built with a lower part 1a fixed in the ground G. On both sides of the building frame, a pair of sub-frame 2 is provided along the height direction of the building frame, in which the top part 2a is rigidly connected to the top part 1b of the building frame, and the lower part 2b is spaced upward from the ground to form a vibration system integral with the building frame. In the building frame, on the lower support part 4 below the lower part of the sub-frame, a seismic isolation support 5 is provided between the lower part of the sub-frame to support at least part of the weight of the sub-frame. In an attachment area F set in each gap S between each of the lower parts of the sub-frames and the lower part of the building frame, a vibration-damping device is oriented around the rigid center R1 of the building frame on a plane along the ground plane E with one end connected to the building frame and the other end connected to the subframe.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vibration control structure for a building structure that can efficiently control the vibration of the building structure against vibration input and effectively suppress the torsion generated in the building structure.

Background Art

[0002] There are various techniques for improving the vibration control effect of buildings. For example, Patent Documents 1 and 2 are known.

[0003] The "bending deformation control type seismic isolation structure" of Patent Document 1 is composed of a wall column composed of a seismic isolation element of a continuous layer connected to a wall beam horizontally protruding at the top, a connecting column rising from the tip position of the wall beam on the plane and insulated from the wall beam, and a seismic isolation device installed between the tip of the wall beam and the top of the connecting column that generates a damping force during relative displacement between the tip of the wall beam and the top of the connecting column, or a pair of wall columns facing each other with the wall beam, and a seismic isolation device installed between the tips of the wall beams of both wall columns. The columns in the building are aggregated into the wall columns and the beams are aggregated into the wall beams for configuration.

[0004] In the "vibration control structure" of Patent Document 2, the structure is a steel frame reinforced concrete building having a three-story underground ramen structure composed of columns and beams, supported by a foundation, with the lower end of the wall-like member firmly fixed, and the deformation of the wall-like member due to the reaction force of the damper is suppressed, so that the decrease in the expansion and contraction amount (deformation amount) of the damper due to the deformation of the wall-like member is suppressed, and the vibration control effect is improved.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] When a horizontal vibration external force such as an earthquake is input to a building structure, the building structure not only sways laterally in the main acting direction of the vibration input, but also twists around the rigid center in a plane that horizontally traverses the building structure. It has been known that the building structure twists, and there has been a demand for measures to effectively suppress the twist of the building structure while efficiently damping the building structure against vibration input.

[0007] The present invention was devised in view of the above-described conventional problems, and an object thereof is to provide a vibration damping structure for a building structure capable of efficiently damping the building structure against vibration input and effectively suppressing the twist generated in the building structure.

Means for Solving the Problems

[0008] The vibration damping structure for a building structure according to the present invention is a vibration damping structure for damping a building structure constructed with its lower part fixed to the ground against vibration input. On both sides of the building structure, a pair of sub-structures are provided along the height direction of the building structure, with their tops rigidly joined to the top of the building structure and their bottoms spaced upward from the ground to form a vibration system integral with the building structure. A support portion is provided below the lower part of the sub-structure on the building structure, and a seismic isolation bearing for supporting at least a part of the weight of the sub-structure is provided between the support portion and the lower part of the sub-structure. In each gap between the lower part of each of these sub-structures and the lower part of the building structure, vibration damping devices are provided in a direction along the rigid center of the building structure in a plane along the ground surface, with one end connected to the building structure and the other end connected to the sub-structure.

[0009] The rigid centers of the pair of sub-structures in a plane along the ground surface are both arranged on a straight line passing through the rigid center of the building structure. The vibration damping devices are arranged in a pair on both sides of the straight line with the straight line passing through the rigid center of the building structure interposed therebetween, and the arrangement mode of these vibration damping devices is such that a tangential line to a circle centered at least on the rigid center of the building structure generates a vibration damping effect in a direction passing through the rigid centers of the pair of sub-structures.

[0010] When the distance from the center of rigidity of one of the sub-structures to the center of rigidity of the building structure is La and the distance from the center of rigidity of the other sub-structure to the center of rigidity of the building structure is Lb, the damping performance Fa of the vibration damping device connected to one of the sub-structures and the damping performance Fb of the vibration damping device connected to the other sub-structure are set in the relationship of La×Fb = Lb×Fa.

Effects of the Invention

[0011] In the vibration control structure of the building structure according to the present invention, the building structure can be efficiently vibration-controlled against vibration input, and the torsion generated in the building structure can be effectively suppressed.

Brief Description of the Drawings

[0012]

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Embodiment for Carrying Out the Invention

[0013] Hereinafter, a preferred embodiment of the vibration damping structure of the building structure according to the present invention will be described in detail with reference to the accompanying drawings.

[0014] FIG. 1 is a front view showing a preferred embodiment of the vibration damping structure of the building structure according to the present invention, FIG. 2 is a side view of the vibration damping structure of the building structure shown in FIG. 1, FIG. 3 is a view taken along the line A-A in FIG. 1, and FIG. 4 is a view taken along the line B-B in FIG. 1.

[0015] The building structure 1 to be vibration-damped is constructed by a well-known column-beam structure such as a steel frame structure, a reinforced concrete structure, a steel frame-reinforced concrete structure, or a steel-concrete composite structure.

[0016] The building structure 1 may be a newly constructed building or an existing building. In the illustrated example, the building structure 1 is shown as a rectangular parallelepiped.

[0017] The building structure 1 is constructed such that the lower part 1a in the height direction of the building structure 1 is rigidly fixed to the ground G, and horizontal vibration external forces such as seismic vibrations are input from the lower part 1a into the building structure 1.

[0018] In such a building structure 1, horizontal vibrations that roll laterally occur in the main acting direction of the vibration input.

[0019] The vibration damping structure of the building structure according to the present embodiment enables the horizontal vibrations generated in the building structure 1 to be efficiently damped by the substructure 2 described later. Further, by providing the substructure 2, when the vibration damping action is working, the torsional deformation D of the building structure 1 that occurs around the rigid center R1 of the building structure 1 in a plane that horizontally crosses the building structure 1, that is, a plane along the ground surface E, can also be effectively suppressed.

[0020] On both sides of the building structure 1, a pair of secondary structures 2, 2 with the same dimensions and weight are provided. "Both sides of the building structure 1" means both sides in the length direction, both sides in the width direction, or both sides in both the width direction and the length direction in the plane of the building structure 1. In the illustrated example, the secondary structures 2, 2 are provided on both sides in the length direction of the building structure.

[0021] When installing the pair of secondary structures 2, 2 on both sides of the building structure 1, it is desirable to install them so that the rigid center R1 of the building structure 1 itself does not move due to these secondary structures 2, 2.

[0022] In other words, it is preferable that the pair of secondary structures 2, 2 be evenly arranged around the rigid center R1 of the building structure 1 with respect to the building structure 1.

[0023] However, by providing the pair of secondary structures 2, 2 on the building structure 1, the rigid center R1 of the building structure 1 may move. In that case, the position after the movement is taken as the rigid center R1 of the building structure 1.

[0024] That is, in this specification, the rigid center R1 of the building structure 1 refers to the rigid center in the state after the pair of secondary structures 2, 2 are provided on the building structure 1.

[0025] The secondary structure 2 is constructed with a well-known column-beam structure such as a steel frame structure, a reinforced concrete structure, a steel-reinforced concrete structure, or a steel-concrete structure.

[0026] The secondary structure 2 is formed along the height direction of the building structure 1 with a length shorter than the height of the building structure 1, from the top 1b to the bottom 1a of the building structure 1.

[0027] Specifically, the secondary structure 2 is constructed such that the top 2a, which is the highest part of the secondary structure 2, is located at approximately the same height as the top 1b, which is the highest part of the building structure 1, and the lower end of the secondary structure 2 is at a higher position than the lower end of the building structure 1 fixed to the ground G so as to be spaced upward from the ground G. In the illustrated example, each secondary structure 2, 2 is shown as a rectangular parallelepiped elongated in the height direction of the building structure 1.

[0028] In order for the sub - structure 2 to form a vibration system integral with the building structure 1, the top 2a of the sub - structure 2 is rigidly joined to the top 1b of the building structure 1.

[0029] When the top 2a of the sub - structure 2 and the top 1b of the building structure 1 are rigidly joined, the horizontal vibration of the building structure 1 is directly transmitted to the sub - structure 2 without being attenuated.

[0030] That is, rigid joining means forming a vibration system in which, as shown in FIG. 5, the sub - structure 2 is connected on top of the top 1b of the building structure 1.

[0031] In the vibration damping structure of the building structure according to this embodiment, for this vibration system, by rigidly joining the tops 1b and 2a of the building structure 1 and the sub - structure 2, the sub - structure 2 is arranged in a relationship parallel to the building structure 1 and at a folded - back position with respect to the building structure 1.

[0032] In the vibration system composed of this building structure 1 and the sub - structure 2, the lower part 1a of the building structure 1 fixed to the ground G becomes a fixed end, and the assumed uppermost part (the lower part of the sub - structure 2 in the folded - back arrangement in this embodiment) 2b of the sub - structure 2 rigidly joined to the top 1b of the building structure 1 becomes a free end.

[0033] When a horizontal vibration is input to the building structure 1, the maximum displacement (maximum amplitude) of the horizontal vibration occurs at the assumed uppermost part (the lower part of the sub - structure 2 in the folded - back arrangement in this embodiment) 2b of the sub - structure 2, which becomes a free end.

[0034] Regarding the rigid joining that joins the top 2a of the sub - structure 2 and the top 1b of the building structure 1, since there is no member or material with attenuation of "zero", it means that vibration transmission with as little attenuation as possible should be achieved between the building structure 1 and the sub - structure 2.

[0035] Further, the sub-frame 2 functions as a weight linked to a vibration damping device 3 described later with respect to the building frame 1 which is a vibration control target in an integrated vibration system with the building frame 1. It is desirable that the weight of the sub-frame 2 is 3.5 to 50% of the weight of the main frame 1.

[0036] An integrated vibration system with the building frame 1 is formed, and a gap S is provided between each of the lower portions 2b, 2b of the sub-frames 2, 2 where the lower portion 2b becomes the free end of the vibration system, and the lower portion 1a of the building frame 1 facing the lower portions 2b, 2b of the sub-frames 2, 2.

[0037] In these gaps S, as shown by the reference sign F in FIGS. 1, 2, and 4, one end is connected to the sub-frame 2 and the other end is connected to the building frame 1, and a mounting area for mounting a vibration damping device 3 that attenuates the horizontal vibration transmitted from the building frame 1 to the sub-frame 2 through a rigid joint and generated in the sub-frame 2 is set.

[0038] That is, by providing the building frame 1 with the sub-frame 2 and the vibration damping device 3, with respect to the building frame 1 which is a spring system, the sub-frame 2 is used as a mass (mass) element and the vibration damping device 3 is used as a damping element, and the building frame 1 is configured to control vibration against a horizontal vibration input.

[0039] And the vibration damping device 3 attenuates the vibration generated in the lower portion 2b of the sub-frame 2 which is the free end where the maximum displacement occurs in the integrated vibration system while being supported by the building frame 1.

[0040] Of course, the vibration attenuated by the vibration damping device 3 may be any vibration that occurs relatively between the sub-frame 2 and the building frame 1.

[0041] As the vibration damping device 3, various well-known devices may be adopted. For example, an oil damper that expands and contracts between the building frame 1 and the sub-frame 2 to attenuate vibration is used.

[0042] The vibration damping device 3 is also arranged along the direction around the rigid center R1 of the building frame 1 and provided between the building frame 1 and the sub-frame 2.

[0043] By providing a pair of sub-structures 2 to the building structure 1, as described above, when horizontal vibration input occurs in the building structure 1, torsion D may occur around its rigid center R1.

[0044] When torsion D occurs in the building structure 1, the vibration damping device 3 suppresses the movement of the lower part 2b of the sub-structure 2 that is displaced by the torsion transmitted from the building structure 1 while being supported by the lower part 1a of the building structure 1. Thereby, the torsion D of the building structure 1 is effectively suppressed.

[0045] Regarding the arrangement mode of the vibration damping device 3 in the attachment region F described above, it will be described below with reference to FIGS. 6 to 9.

[0046] FIG. 6 is a schematic plan view for explaining the arrangement mode of the vibration damping device in the vibration damping structure of the building structure according to the present embodiment, and FIG. 7 is a schematic plan view for explaining an example of the arrangement state of the vibration damping device in the attachment region.

[0047] At the height position where the attachment region F of the vibration damping device 3 is set, the rigid center R1 in the plane along the ground surface E of the building structure 1 and the respective rigid centers R2, R2 of the pair of sub-structures 2, 2 in the plane along the same ground surface E as the ground G on which the building structure 1 is constructed are both arranged on a straight line L.

[0048] That is, the above rigid centers R2, R2 of the pair of sub-structures 2, 2 are both arranged on a straight line L passing through the rigid center R1 of the building structure 1.

[0049] From this, the pair of sub-structures 2, 2 are constructed on both sides of the building structure 1 such that their rigid centers R2, R2 are arranged side by side on a straight line L passing through the rigid center R1 of the building structure 1.

[0050] In the attachment region F of the vibration damping device 3 set in the gap S, the vibration damping device 3 is, firstly, arranged in a manner that sandwiches the straight line L passing through the rigid center R1 of the building structure 1 and passing through the rigid centers R2, R2 of the pair of sub-structures 2, 2, and is arranged in a pair on both sides of the straight line L (see FIG. 7).

[0051] If there are a pair of vibration damping devices 3 with respect to the straight line L, the number of devices installed is not limited.

[0052] Therefore, the vibration damping devices 3 are arranged in a pair on one side and the other side divided by the straight line L with respect to the rigid centers R2, R2 of each of the sub - frameworks 2, 2.

[0053] Second, the arrangement pattern of these vibration damping devices 3 is set by the tangent lines Tn (n is a natural number) drawn from the rigid centers R2, R2 of each of the sub - frameworks 2, 2 toward the circle Cn (n is a natural number) drawn with the rigid center R1 (the center of the torsion D) of the building structure 1 as the center.

[0054] A pair of tangent lines Tn from the rigid center R2 of the sub - framework 2 are drawn on both one side and the other side divided by the straight line L.

[0055] A plurality of circles Cn with different radii can be drawn with the rigid center R1 of the building structure 1 as the center, and there are also a plurality of tangent lines Tn taken from the rigid center R2 of the sub - framework 2 so as to be tangent to each of these plurality of circles Cn.

[0056] The pair of vibration damping devices 3, 3 arranged on both sides of the straight line L are arranged so that the vibration damping effect occurs in the direction of the tangent line Tn tangent to the circle Cn.

[0057] Regardless of which tangent line Tn of which circle Cn, they are arranged in the direction of any tangent line Tn of any circle Cn.

[0058] Among the plurality of circles Cn around the rigid center R1 of the building structure 1, since the displacement of the torsion D at the top 1b of the building structure 1 becomes maximum along the outermost and largest-radius circle (hereinafter also referred to as the maximum circle) Cn, the vibration damping device 3 connected to the lower part 2b of the sub-structure 2 to which the torsion D is directly transmitted from the top 1b of the building structure 1 is installed in the attachment region F as long as the vibration damping device 3 can be installed. It is desirable that the vibration damping device 3 be arranged so that the vibration damping action (torsion suppression action) occurs in the direction of the tangent line Tn from the rigid center R2 of the sub-structure 2 that touches this maximum circle Cn.

[0059] In the case of the oil damper that expands and contracts and attenuates vibration as described above, the expansion and contraction operation direction is directed in the tangent direction Tn from the rigid center R2 of the sub-structure 2 to the maximum circle Cn.

[0060] In terms of the arrangement form, as shown in FIG. 7, within the attachment region F of the vibration damping device 3 set in the gap S, as long as one end 3a can be connected to the building structure 1 and the other end 3b can be connected to the sub-structure 2, it is in a horizontal posture with respect to the ground surface E, and with respect to the straight line L, the distance from the straight line L is short at the other end 2b on the sub-structure 2 side and long at the one end 3a on the building structure 1 side. In the relationship between a pair of vibration damping devices 3, 3 of each sub-structure 2, it is desirable that they are arranged in a "H" shape in plan view where the one ends 3a are separated from each other on the building structure 1 side and the other ends 3b are close to each other on the sub-structure 2 side.

[0061] The vibration damping device 3 arranged in this way, no matter what vibration mode occurs between the building structure 1 and the sub-structure 2, of course, generates a vibration damping action by the input of the component force of the vibration force and exhibits a vibration control action.

[0062] In short, the arrangement of the vibration damping device 3 provided between each sub-framework 2 and the building framework 1 is such that the vibration damping action occurs in the direction in which any tangent line Tn tangent to any circle Cn centered on at least the rigid center R1 of the building framework 1 passes through the rigid center R2 of the sub-framework 2. Thus, the vibration damping device 3 can efficiently damp the vibration of the building framework 1 caused by the horizontal vibration input through the above-described integrated vibration system, and at the same time effectively suppress the torsion D generated in the building framework 1.

[0063] Regarding the action of the vibration control structure of the building framework according to the present embodiment, when a horizontal vibration external force such as seismic motion occurs in the ground G and this vibration external force is input to the building framework 1, since the top 1b of the building framework 1 and the top 2a of the sub-framework 2 are rigidly joined, with the lower part 1a of the building framework 1 fixed to the ground G as the fixed end and the lower parts 2b of the pair of sub-frameworks 2 provided on both sides of the building framework 1 as the free ends, vibration occurs in the integrated vibration system shown in FIG. 5. Also, when the vibration control action is acting on the building framework 1, torsion D occurs around the rigid center R1 of the building framework 1.

[0064] The vibration damping device 3 provided in each gap S between the lower part 1a of the building framework 1 and each of the lower parts 2b of the pair of sub-frameworks 2 can damp the vibration of the building framework 1 against the vibration input, with the building framework 1 as the spring element, the sub-framework 2 as the mass element, and the vibration damping device 3 as the damping element. And further, by arranging the vibration damping device 3 along the circumference around the rigid center R1 of the building framework 1, the torsion D of the building framework 1 can also be suppressed by the vibration damping device 3.

[0065] Regarding the suppression of torsion D, specifically, when the torsion D generated at the top 1b of the building framework 1 is transmitted to the sub-framework 2 through the rigid joint and the lower part 2b of the sub-framework 2 is relatively displaced with respect to the lower part 1a of the building framework 1, for each of the pair of vibration damping devices 3 of each sub-framework 2, the torsional force from the building framework 1 acts along the tangent line Tn of the circle Cn around the rigid center R1 of the building framework 1. A compressive force is input to one of the pair of vibration damping devices 3, 3, and a tensile force is input to the other, so that the torsional force can be damped.

[0066] In this way, a force can be applied to the vibration damping device 3 in the direction of the twist D (tangential direction), and the twist D generated in the building structure 1 can be effectively suppressed.

[0067] The torsional deformation generated in the building structure 1 is most prominent at the lower part 2b of the secondary structure 2 that becomes the free end. Therefore, by connecting the lower part 2b of the secondary structure 2 where the deformation is prominent to the lower part 1a of the building structure 1 via the vibration damping device 3, the twist D generated in the building structure 1 can be efficiently and effectively suppressed.

[0068] In particular, if the vibration damping device 3 is arranged such that the vibration damping effect occurs along the tangent line Tn from the rigid center R2 of the secondary structure 2 in contact with the above-mentioned maximum circle Cn where the displacement of the twist D of the building structure 1 is the largest, the twist D generated in the building structure 1 can be suppressed most effectively and efficiently.

[0069] Furthermore, when the torsional phase between the lower part 1a of the building structure 1 that becomes the fixed end of the integrated vibration system and the lower part 2b of the secondary structure 2 that becomes the free end is in the opposite phase, the maximum relative displacement of the twist is input to the vibration damping device 3 arranged along the tangent line Tn of the above-mentioned maximum circle Cn, and the maximum torsional suppression effect can be exerted.

[0070] The vibration damping device 3 arranged in this way can not only suppress the twist D, but also damp the vibration with respect to the component force of the above-mentioned horizontal vibration input that vibrates the building structure 1, and can damp the building structure 1.

[0071] In the vibration damping structure of the building structure according to the present embodiment, further, a support portion 4 is integrally provided at the lower part 1a of the building structure 1 so as to project downward below the lower part 2b of the secondary structure 2.

[0072] On this support part 4, between it and the lower part 2b of the sub-frame 2, there is provided a seismic isolation bearing 5 that is rigidly joined to the top 1b of the building frame 1 and supports at least a part of the weight of the sub-frame 2 suspended and supported from the top 1b without interfering with the vibration damping effect of the vibration damping device 3. As the seismic isolation bearing 5, for example, a laminated rubber type seismic isolation device or a ball slide mechanism is used.

[0073] By supporting part or all of the weight of the sub-frame 2 with the seismic isolation bearing 5, the burden on the top 1b of the building frame 1 to which the sub-frame 2 is rigidly joined to support the entire weight of the sub-frame 2 can be reduced. Thereby, the rigidity of the top 1b of the building frame 1 can be set small, and the workability can be improved.

[0074] FIG. 8 and FIG. 9 are explanatory diagrams for explaining the case where the rigid center R1 of the building frame 1 is displaced from the centroid X in the plane along the ground surface E of the building frame 1.

[0075] In FIG. 6, the rigid center R1 of the building frame 1 coincides with the centroid, but there may also be cases where they are displaced.

[0076] FIG. 8 shows the case where, on the straight line L along the length direction of the building frame 1, the distance (La) from the rigid center R2 of one sub-frame 2 to the rigid center R1 of the building frame 1 is close, and the distance (Lb) from the rigid center R2 of the other sub-frame 2 to the rigid center R1 of the building frame 1 is far.

[0077] In each sub-frame 2, 2, the arrangement directions of the pair of vibration damping devices 3, 3 are, as described above, in a "V" shape obliquely to the straight line L, and the relationship between the damping performance Fa of the vibration damping device 3 connected to one sub-frame 2 and the damping performance Fb of the vibration damping device 3 connected to the other sub-frame 2 is set to La×Fb = Lb×Fa.

[0078] FIG. 9 shows the case of an anisotropic building where the rigid center R1 of the building frame 1 is displaced from the rigid center R0 in the width direction and the length direction due to the overhanging part 1c (rigid center Rc), etc.

[0079] Even in this case, with respect to the rigid center R1 of the anisotropic building structure 1, the sub-structures 2, 2 are arranged with respect to the building structure 1 such that the rigid centers R2, R2 in the plane along the ground surface E of the pair of sub-structures 2, 2 are both arranged on a straight line L passing through the rigid center R1 of the building structure 1. On the straight line L, based on the distance (La) from the rigid center R2 of one sub-structure 2 to the rigid center R1 of the building structure 1 and the distance (Lb) from the rigid center R2 of the other sub-structure 2 to the rigid center R1 of the building structure 1, the relationship between the damping performance Fa of the vibration damping device 3 connected to one sub-structure 2 and the damping performance Fb of the vibration damping device 3 connected to the other sub-structure 2 is set to La×Fb = Lb×Fa.

[0080] That is, although the position of the rigid center R1 of the building structure 1 varies, if the dimensions and weights of the pair of sub-structures 2, 2 are the same and the rigid centers R2, R2 in the plane along the ground surface E of these sub-structures 2 are both arranged on a straight line L passing through the rigid center R1 of the building structure 1, the damping performance of the vibration damping device 3 of one sub-structure 2 can be set in a well-balanced manner by multiplying the damping performance of the vibration damping device 3 of the other sub-structure 2 by the ratio of the distance between the rigid center R1 of the building structure 1 and the rigid center R2 of each sub-structure 2, and the torsion generated due to imbalance in the structure arrangement or the like can be effectively suppressed.

Explanation of Symbols

[0081] 1 Building structure 1a Lower part of the building structure 1b Top part of the building structure 2 Sub-structure 2a Top part of the sub-structure 2b Lower part of the sub-structure 3 Vibration damping device 3a One end of the vibration damping device 3b The other end of the vibration damping device 4 Support part 5 Base isolation bearing Cn Circle centered on the rigid center of the building structure D Torsion E Ground surface Fa Damping performance of the vibration damping device connected to one sub-structure Fb Damping performance of the vibration damping device connected to the other sub-structure Ground G L A straight line passing through the rigid centers of each pair of secondary structures and the rigid center of the building structure La Distance from the rigid center of one secondary structure to the rigid center of the building structure Lb Distance from the rigid center of the other secondary structure to the rigid center of the building structure R1 Rigid center of the building structure R2 Rigid center of the secondary structure S Gap Tn Tangent line that touches the circle and passes through the rigid center of the secondary structure

Claims

1. A vibration damping structure for damping a building structure constructed with its lower part fixed to the ground against vibration input, comprising: On both sides of the building structure, a pair of sub-structures are provided along the height direction of the building structure, with their tops rigidly joined to the top of the building structure, their bottoms spaced upward from the ground, and forming a vibration system integral with the building structure. Below the lower part of the building structure, a support part spaced upward from the ground is provided below the lower part of the sub-structure. On the support part, a seismic isolation bearing for supporting at least a part of the weight of the sub-structure is provided between the support part and the lower part of the sub-structure. In each gap between the lower part of each of these sub-structures and the lower part of the building structure, vibration damping devices are provided, arranged in a direction along the centroid of the building structure in a plane along the ground surface, connecting one end to the building structure and the other end to the sub-structure. A vibration damping structure for a building structure, characterized in that the vibration damping devices are provided.

2. The centroids of the pair of sub-structures in a plane along the ground surface are both arranged on a straight line passing through the centroid of the building structure. The vibration damping devices are arranged in a pair on both sides of the straight line sandwiching the straight line passing through the centroid of the building structure, and the arrangement mode of these vibration damping devices is such that the tangents to the circle centered at least on the centroid of the building structure are directed in the direction passing through the centroids of the pair of sub-structures so that the vibration damping effect occurs. A vibration damping structure for a building structure according to Claim 1, characterized in that.

3. When the distance from the centroid of one of the sub-structures to the centroid of the building structure is La and the distance from the centroid of the other sub-structure to the centroid of the building structure is Lb, the damping performance Fa of the vibration damping device connected to one of the sub-structures and the damping performance Fb of the vibration damping device connected to the other sub-structure are set in the relationship of La × Fb = Lb × Fa. A vibration damping structure according to Claim 2, characterized in that.

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