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 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 effectively 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 includes a wall column composed of a seismic isolation element of continuous layers connected to a wall beam that horizontally projects at the top, a connecting column that rises from the tip position of the wall beam on the plane and is 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 beams, 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 wall columns and the beams are aggregated into wall beams for construction.

[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. The lower end of the wall-like member is 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 action direction of the vibration input, but it is also known that torsion occurs in the building structure around the rigid center in a plane cutting the building structure horizontally. There has been a demand for measures to effectively suppress the torsion of the building structure while efficiently damping the building structure against the 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 torsion 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 above 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 lower parts spaced upward from the ground to form a vibration system integrated with the building structure. In each gap between the lower parts of these sub-structures and the lower part of the above building structure, vibration damping devices are provided, arranged in a direction along the rigid center 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.

[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 above straight line with the straight line passing through the rigid center of the building structure in between, and the arrangement mode of these vibration damping devices is such that at least a tangent line touching a circle centered on the rigid center of the building structure generates a vibration damping effect in the direction passing through the rigid centers of the pair of sub-structures.

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

Advantages of the Invention

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

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0013] Hereinafter, a preferred embodiment of the vibration control structure of a 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 control structure of a building structure according to the present invention, FIG. 2 is a side view of the vibration control 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-controlled is constructed of 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 to the building structure 1.

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

[0019] The vibration control structure of the building structure according to the present embodiment enables the horizontal vibrations generated in the building structure 1 to be efficiently vibration-controlled by a sub-structure 2 described later. Further, by providing the sub-structure 2, when the vibration control action is working, the torsion D of the building structure 1 generated around the rigid center R1 of the building structure 1 in a plane that horizontally crosses the building structure 1, that is, in 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. The "both sides of the building structure 1" may refer to 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 are 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 long rectangular parallelepiped in the height direction of the building structure 1.

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

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

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

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

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

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

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

[0035] In addition, 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 be 3.5 to 50% of the weight of the main frame 1.

[0036] An integrated vibration system is formed with the building frame 1, 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 symbol 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 is set for mounting a vibration damping device 3 that damps the horizontal vibration transmitted from the building frame 1 to the sub-frame 2 through a rigid connection and generated in the sub-frame 2.

[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 damps the vibration generated in the lower portion 2b of the sub-frame 2, which is the free end where the maximum displacement occurs, in an integrated vibration system while being supported by the building frame 1.

[0040] Of course, the vibration damped 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 damp 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 is input to 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 is supported at the lower part 1a of the building structure 1 and 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, thereby effectively suppressing the torsion D of the building structure 1.

[0045] The arrangement mode of the vibration damping device 3 in the attachment region F described above 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 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 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] As long as the vibration damping devices 3 are paired with respect to the straight line L, any number of them can be installed, and the number 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 the respective 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 the respective sub - frameworks 2, 2 toward the circle Cn (n is a natural number) drawn around the rigid center R1 (center of the torsion D) of the building structure 1.

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

[0055] A plurality of circles Cn centered on the rigid center R1 of the building structure 1 can be drawn with different radii, 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 the maximum along the outermost circle Cn with the largest radius (hereinafter also referred to as the maximum circle), the vibration damping device 3 connected to the lower part 2b of the secondary structure 2 to which the torsion D is directly transmitted from the top 1b of the building structure 1 is installed in the attachment area F as long as the vibration damping device 3 can be installed. It is desirable that the vibration damping device 3 be arranged with its orientation set so that a vibration damping action (torsion suppression action) occurs in the direction of the tangent line Tn from the rigid center R2 of the secondary structure 2 that touches this maximum circle Cn.

[0059] In the case of the oil damper that undergoes the telescopic operation and vibration damping described above, the telescopic operation direction is directed in the direction of the tangent line Tn from the rigid center R2 of the secondary structure 2 to the maximum circle Cn.

[0060] In terms of the arrangement form, as shown in FIG. 7, within the attachment area F of the vibration damping device 3 set in the gap S, as long as one end 3a is connected to the building structure 1 and the other end 3b can be connected to the secondary structure 2, it is in a horizontal posture with respect to the ground surface E. With respect to the straight line L, the distance from the straight line L is shorter at the other end 2b on the secondary structure 2 side and longer at the one end 3a on the building structure 1 side, showing an oblique relationship. In the relationship between a pair of vibration damping devices 3, 3 of each secondary structure 2, it is desirable that they be 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 secondary structure 2 side.

[0061] The vibration damping device 3 arranged in this way will of course generate a vibration damping action and exhibit a vibration damping effect when the component force of the vibration force is input regardless of the vibration mode generated between the building structure 1 and the secondary structure 2.

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

[0063] Regarding the operation of the vibration control structure of the building structure 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 structure 1, since the top 1b of the building structure 1 and the top 2a of the sub-structure 2 are rigidly joined, with the lower part 1a of the building structure 1 fixed to the ground G as a fixed end and the lower parts 2b of the pair of sub-structures 2 provided on both sides of the building structure 1 as free ends, vibration occurs in the integrated vibration system shown in FIG. 5. Also, when a vibration control action is acting on the building structure 1, torsion D occurs around the rigid center R1 of the building structure 1.

[0064] The vibration damping device 3 provided in each gap S between the lower part 1a of the building structure 1 and each of the lower parts 2b of the pair of sub-structures 2 can damp the vibration input to the building structure 1 with the building structure 1 as a spring element, the sub-structure 2 as a mass element, and the vibration damping device 3 as a damping element. And further, by arranging the vibration damping device 3 along the circumference around the rigid center R1 of the building structure 1, the torsion D of the building structure 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 structure 1 is transmitted to the sub-structure 2 through the rigid joint and the lower part 2b of the sub-structure 2 is relatively displaced with respect to the lower part 1a of the building structure 1, a torsional force from the building structure 1 acts along the tangent line Tn of the circle Cn around the rigid center R1 of the building structure 1 on each of the pair of vibration damping devices 3 of each sub-structure 2. 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, it is possible to apply a force to the vibration damping device 3 in the direction of the twist D (tangential direction), and effectively suppress the twist D generated in the building structure 1.

[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 so that the vibration damping effect occurs along the tangent 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 is the fixed end of the integrated vibration system and the lower part 2b of the secondary structure 2 that is the free end is in the opposite phase, the vibration damping device 3 arranged along the tangent Tn of the above-mentioned maximum circle Cn will receive the maximum relative displacement of the twist, and can exert the maximum twist suppression effect.

[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 suppress the vibration of the building structure 1.

[0071] FIGS. 8 and 9 are explanatory diagrams for explaining the case where the rigid center R1 of the building structure 1 is displaced from the centroid X in the plane along the ground surface E of the building structure 1.

[0072] In FIG. 6, the rigid center R1 of the building structure 1 coincides with the centroid, but there are also cases where they are displaced.

[0073] FIG. 8 shows a case where, on the straight line L along the length direction of the building structure 1, the distance (La) from the rigid center R2 of one secondary structure 2 to the rigid center R1 of the building structure 1 is short, and the distance (Lb) from the rigid center R2 of the other secondary structure 2 to the rigid center R1 of the building structure 1 is long.

[0074] In each of the secondary structures 2, 2, the arrangement directions of the pair of vibration damping devices 3, 3 are in a "V" shape that is oblique to the straight line L as described above. The relationship between the damping performance Fa of the vibration damping device 3 connected to one secondary structure 2 and the damping performance Fb of the vibration damping device 3 connected to the other secondary structure 2 is set to La × Fb = Lb × Fa.

[0075] FIG. 9 shows a case of an anisotropic building in which the rigid center R1 of the building structure 1 is displaced from the rigid center R0 in the width direction and the length direction due to the protruding portion 1c (rigid center Rc) or the like.

[0076] Even in this case, with respect to the rigid center R1 of the anisotropic building structure 1, the secondary 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 secondary structures 2, 2 are both arranged on a straight line L passing through the rigid center R1 of the building structure 1. Based on the distance (La) from the rigid center R2 of one secondary structure 2 to the rigid center R1 of the building structure 1 and the distance (Lb) from the rigid center R2 of the other secondary structure 2 to the rigid center R1 of the building structure 1 on the straight line L, the relationship between the damping performance Fa of the vibration damping device 3 connected to one secondary structure 2 and the damping performance Fb of the vibration damping device 3 connected to the other secondary structure 2 is set to La × Fb = Lb × Fa.

[0077] That is, although the position of the rigid center R1 of the building structure 1 is diverse, if the dimensions and weights of the pair of secondary structures 2, 2 are the same and the rigid centers R2, R2 in the plane along the ground surface E of these secondary 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 secondary structure 2 can be set in a well-balanced manner by multiplying the ratio of the distance between the rigid center R1 of the building structure 1 and the rigid center R2 of each secondary structure 2 with respect to the damping performance of the vibration damping device 3 of the other secondary structure 2, and the torsion generated due to the imbalance of the structural arrangement or the like can be effectively suppressed.

[0078] In the vibration damping structure of the building structure according to this embodiment, as shown in FIG. 1, only the top 2a of the pair of sub-structures 2, 2 is provided in rigid connection with the top 1b of the building structure 1, whereby these sub-structures 2 are respectively provided in a suspended and supported manner from the top 1b of the building structure 1.

[0079] The top 1b of the building structure 1 that is rigidly connected to the top 2a of the sub-structure 2 is, if necessary, set to have a higher rigidity than other parts of the building structure 1 other than the top 1a of the building structure 1, as shown by the hatched area J in FIG. 1, so as to withstand the suspended support of the sub-structure 2.

[0080] To improve the rigidity of the top 1b of the building structure 1 that can suspend and support the sub-structure 2, for example, well-known rigidity enhancement means such as increasing the amount of steel in the column-beam structure constituting the top 1b or making only the top 1b of SRC construction when the building structure 1 is of RC construction may be adopted.

[0081] Also, instead of uniformly increasing the rigidity of the entire top 1b of the building structure 1, it is of course possible to set the rigidity to be high only for the periphery of the part where the rigid connection is made, as shown by the hatched area K in FIG. 3.

[0082] FIG. 10 shows a modification of the vibration damping structure of the building structure according to this embodiment. In this modification, a support portion 4 is integrally provided at the lower part 1a of the building structure 1 so as to protrude downward from the lower part 2b of the sub-structure 2.

[0083] On this support portion 4, an aseismic bearing 5 is provided between the lower part 2b of the sub-structure 2 to support at least a part of the weight of the sub-structure 2 suspended and supported from the top 1a of the building structure 1 without interfering with the vibration damping action of the vibration damping device 3. As the aseismic bearing 5, for example, a laminated rubber type seismic isolation device or a ball slide mechanism is used.

[0084] By supporting part or all of the weight of the substructure 2 with the seismic isolation bearing 5, the burden on the top 1b of the building structure 1 to which the substructure 2 is rigidly joined to support the entire weight of the substructure 2 can be reduced. As a result, the rigidity of the top 1b of the building structure 1 can be set small, and the workability can be improved.

Explanation of Signs

[0085] 1 Building structure 1a Lower part of the building structure 1b Top of the building structure 2 Substructure 2a Top of the substructure 2b Lower part of the substructure 3 Vibration damping device 3a One end of the vibration damping device 3b The other end of the vibration damping device Cn Circle centered on the rigidity center of the building structure D Torsion E Ground surface Fa Damping performance of the vibration damping device connected to one substructure Fb Damping performance of the vibration damping device connected to the other substructure G Ground L Straight line passing through the rigidity centers of each of the pair of substructures and the rigidity center of the building structure La Distance from the rigidity center of one substructure to the rigidity center of the building structure Lb Distance from the rigidity center of the other substructure to the rigidity center of the building structure R1 Rigidity center of the building structure R2 Rigidity center of the substructure S Gap Tn Tangent line in contact with the circle and passing through the rigidity center of the substructure

Claims

1. A vibration control structure for controlling vibration of a building structure constructed with its lower part fixed to the ground, 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 integrated with the building structure; In each gap between the lower parts of these sub-structures and the lower part of the building structure, vibration damping devices are provided, arranged in a direction along the circumference of the rigid center 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; The rigid centers of the pair of sub-structures in the 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 above-mentioned straight line with the straight line passing through the rigid center of the building structure in between, and the arrangement pattern of these vibration damping devices is such that the tangents to at least a circle centered on the rigid center of the building structure generate a vibration damping effect in the direction passing through the rigid centers of the pair of sub-structures. A vibration control structure for a building structure, characterized in that.

2. When the distance from the rigid center of one of the sub-structures to the rigid center of the building structure is La and the distance from the rigid center of the other sub-structure to the rigid center 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. The vibration control structure according to Claim 1, characterized in that.

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