Displacement suppression device of building structure

Abstract

To provide a displacement suppression device capable of suppressing excessive displacement of a structure such as a building.SOLUTION: A displacement suppression device comprises: an elastic part 10 extending in an X direction and bendable in a Y direction perpendicular to the X direction and in its opposite direction; and a restraint part 20 including a pair of opposing surfaces 21 located on both sides of the elastic part 10 in the Y direction and facing each other in the Y direction. Each opposing surface 21 includes a first surface 21a supporting a base part 11 of the elastic part 10, and a second surface 21b that is spaced apart from the elastic part 10 as it moves from the base part 11 of the elastic part 10 that receives a load toward an end part 13 of the elastic part 10. The second surface 21b has a curved shape that allows the elastic part 10 to bend only within a range of elastic deformation.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a displacement suppression device installed in a building structure. [Background technology]

[0002] In seismic isolation structures, seismic isolation rubber is installed in the seismic isolation layer between the building and the foundation or between floors, and attenuates the seismic motion transmitted from the foundation to the building during an earthquake.Seismic isolation rubber also has the function of lengthening the period of the seismic motion transmitted to the building.

[0003] Meanwhile, measures against long-period seismic motion that occurs in large-scale earthquakes are becoming increasingly important. High-rise buildings generally have longer natural periods than low-rise buildings, making them more susceptible to resonance. When a high-rise building resonates, it sways significantly in the horizontal direction, posing the risk of it colliding with the retaining wall of its seismic isolation layer. Patent Document 1 discloses a hardening-type seismic isolation device that suppresses displacement or vibration in two intersecting horizontal directions to avoid such collisions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-127927 Summary of the Invention [Problem to be solved by the invention]

[0005] In current earthquake-resistant designs using rigid frame structures, plastic hinges are created at the ends of the beams during a major earthquake, intentionally causing plastic deformation in the building structure, thereby increasing its energy absorption capacity. However, because rigid frame structures are long-term load-bearing members, there is a possibility that their natural period will become longer due to cumulative damage if they become plastic. In other words, there is a concern that long-term use will result in excessive displacement and deformation during an earthquake. As in this example, suppressing excessive displacement and deformation of building structures due to earthquake motion is a permanent challenge in various structures, including earthquake resistance, vibration control, and seismic isolation.

[0006] The present disclosure has been made in consideration of the above circumstances, and aims to provide a displacement suppression device that can suppress excessive displacement of a structure such as a building. [Means for solving the problem]

[0007] A displacement suppression device for a structure according to one embodiment of the present disclosure comprises an elastic portion extending in a first direction and capable of bending in a second direction perpendicular to the first direction and in the opposite direction, and a restraint portion including a pair of opposing surfaces located on both sides of the elastic portion in the second direction and opposing each other in the second direction, each of the opposing surfaces including a first surface supporting a base of the elastic portion and a second surface that becomes more distant from the elastic portion as it moves from the base of the elastic portion that receives the load toward the end of the elastic portion, and the second surface has a curved shape that only allows the elastic portion to bend within the range of elastic deformation.

[0008] The second surfaces may be provided on both sides of the first surface in the first direction. The elastic portion may be formed of a plurality of plates stacked in the second direction. The group of elastic portions and the group of restraint portions may be arranged in a plane-symmetric relationship with respect to a second imaginary plane that is orthogonal to a first imaginary plane including the first direction and the second direction and intersects with the first direction, forming a pair. The pair may further be arranged in a plane-symmetric relationship with respect to a third imaginary plane that is orthogonal to the first imaginary plane and the second imaginary plane. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a displacement suppression device that can suppress excessive displacement of a structure such as a building. [Brief explanation of the drawings]

[0010] [Figure 1A] 10A to 10C are diagrams illustrating application examples of displacement suppression devices according to the embodiments. [Figure 1B] 10A and 10B are diagrams illustrating other application examples of the displacement suppression device according to the embodiments. [Figure 2] 1 is a side view illustrating a displacement suppression device according to a first embodiment. FIG. [Figure 3] 10A and 10B are diagrams illustrating an example of a state in which an elastic portion is deflected by a load. [Figure 4] 10 is a graph illustrating the restoring force characteristics of the displacement suppression device according to each embodiment. [Figure 5] FIG. 10 is a side view illustrating the displacement suppression device according to the second embodiment. [Figure 6] FIG. 10 is a side view illustrating a displacement suppression device according to a third embodiment. [Figure 7A] FIG. 10 is a top view illustrating a displacement suppression device according to a fourth embodiment. [Figure 7B] FIG. 7B is a side view of the displacement suppression device shown in FIG. 7A. [Figure 8A] FIG. 10 is a top view illustrating a displacement suppression device according to a fifth embodiment. [Figure 8B] FIG. 8B is a side view of the displacement suppression device shown in FIG. 8A. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, several embodiments of the present disclosure will be described. Note that the same reference numerals will be used to designate components common to the embodiments, and redundant explanations will be omitted. For convenience of explanation, the X, Y, and Z directions are defined as being orthogonal to one another.

[0012] FIG. 1A is a diagram showing an application example of the displacement suppression device 1. FIG. 1B is a diagram showing another application example of the displacement suppression device 1. As described below, the displacement suppression device 1 according to each embodiment of the present disclosure suppresses excessive displacement of one of the first structure 41 and the second structure 42 (see FIG. 2) relative to the other in a direction parallel to the direction in which a load is applied. For ease of explanation, it is assumed that the second structure 42 is stationary and that the load is applied from the first structure 41 due to the displacement of the first structure 41. Naturally, this relationship is relative, and it is also possible to consider that the load is applied from the second structure.

[0013] As shown in FIG. 1A, the displacement suppression device 1 is installed, for example, in a shear-link type seismic control mechanism 50 in a rigid frame. Specifically, the displacement suppression device 1 is provided between a connecting portion 53 of two braces (diagonal members) 52 extending from both ends of an upper beam 51U toward the center of a lower beam 51L and a column 54. In this case, one of the first structure and the second structure is the connecting portion 53, and the other is the column 54. The displacement suppression device 1 is installed at least either between the connecting portion 53 and the left column 54L or between the connecting portion 53 and the right column 54R. The displacement suppression device 1 may also be used in combination with a vibration energy absorbing device (not shown), such as an oil damper. In this case, the displacement suppression device 1 is installed at least either between the connecting portion 53 and the left column 54L or between the connecting portion 53 and the right column 54R, and a vibration energy absorbing device is installed on the other side.

[0014] 1B, the displacement suppression device 1 is installed, for example, between a beam 61 and a foundation 62 of a building 60. In this case, the displacement suppression device 1 is used in combination with a seismic isolation device 63, with one of the first structure and the second structure serving as the beam of the building 60 and the other serving as the foundation 62. The displacement suppression device 1 may also be installed on another seismic isolation layer (for example, on the floor side of a seismic isolation layer provided between stories).

[0015] [First embodiment] First, a first embodiment of the present disclosure will be described. Fig. 2 is a side view illustrating a displacement suppression device 1A according to the first embodiment. Fig. 3 is a diagram illustrating a state in which the elastic portion 10 is deflected by a load. Fig. 4 is a graph illustrating the restoring force characteristics of the displacement suppression device 1A according to each embodiment.

[0016] 2, the displacement suppression device 1A includes an elastic part 10 connected to a first structure 41 and a restraint part 20 connected to a second structure. The first structure 41 and the second structure 42 are two structures whose relative position changes due to vibration. In this embodiment, for the sake of convenience, it is assumed that the relative position of the first structure 41 with respect to the second structure 42 fluctuates in the Y direction and the opposite direction.

[0017] The elastic portion 10 is a solid rod-shaped or plate-shaped member having a predetermined thickness in the Y direction (second direction) and extending in the X direction (first direction). The elastic portion 10 is provided between a pair of opposing surfaces 21 provided on the restraint portion 20. The elastic portion 10 is formed from a material that can obtain the desired elastic deformation, such as a well-known aluminum alloy, carbon steel, or alloy steel. The cross-sectional shape of the elastic portion 10 perpendicular to the X direction is, for example, a rectangle extending in the Y direction and the Z direction. However, as long as the base portion 11 of the elastic portion 10 is supported by the restraint portion 20, the cross-sectional shape of the elastic portion 10 is not limited to a rectangle.

[0018] The elastic portion 10 includes a base portion 11, a flexible portion 12, and an end portion 13. The base portion 11 is supported by the restraining portion 20. Specifically, the base portion 11 is supported by contact with or clamped by a first surface 21a included in a pair of opposing surfaces 21. Unlike the flexible portion 12, the bending and displacement of the base portion 11 is restricted by contact with the first surface 21a.

[0019] The flexible portion 12 extends from the base portion 11 to the end portion 13, and most of its portion is located between the second surfaces 21b included in the pair of opposing surfaces 21. A gap is formed between the flexible portion 12 and each second surface 21b, and the flexible portion 12 is flexible in the Y direction as the second direction and in the opposite direction (upward and downward in FIG. 2).

[0020] The end 13 is provided at the tip of the elastic portion 10 located outside the restraint portion 20. The end 13 is connected to the first structure 41 and receives a load from the first structure 41. The end 13 is located at a position where deflection of the portion 12b of the flexible portion 12 exposed to the outside from the restraint portion 20 does not affect the restoring force characteristics of the entire displacement suppression device 1A. In other words, the length L2 in the X direction of the portion 12b is set to a value that prevents the portion 12b from deflecting excessively when the restoring force characteristics transition from one of a primary rigidity region and a secondary rigidity region, which will be described later, to the other. Therefore, the length L2 is sufficiently shorter than the length L1 in the X direction of the portion 12a of the flexible portion 12 located within the restraint portion 20.

[0021] The restraint portion 20 is attached to the second structure 42 on the side opposite to the side facing the first structure 41, and supports the elastic portion 10. The material of the restraint portion 20 is, for example, a well-known aluminum alloy, carbon steel, or alloy steel, similar to the elastic portion 10. The restraint portion 20 is formed to have higher rigidity than the elastic portion 10.

[0022] The restraint unit 20 includes a pair of opposing surfaces 21 located on both sides of the elastic unit 10 in the Y direction. The pair of opposing surfaces 21 face each other along the Y direction. The pair of opposing surfaces 21 may be formed as side surfaces of a groove in which the elastic unit 10 is mounted, or may be provided as opposing surfaces of two structures provided separately from each other. In the former case, the width of the groove is equal to the length of the base 11 of the elastic unit 10 along the Y direction. On the other hand, in the latter case, an opposing surface 21 is formed on each of the two structures, and these opposing surfaces 21 sandwich the base 11. FIG. 2 shows an example of the latter case, in which two plate portions 22 serving as the restraint unit 20 sandwich the base 11 by tightening fastening members 23 such as bolts.

[0023] Each opposing surface 21 includes a first surface 21a and a second surface 21b. The first surface 21a is formed as a flat surface and contacts the base 11 of the elastic portion 10. That is, the first surfaces 21a of the pair of opposing surfaces 21 support (sandwich) the base 11 of the elastic portion 10 located therebetween.

[0024] The second surface 21b is a curved surface formed continuously with the first surface 21a. The second surface 21b is curved so as to move away from the elastic portion 10 from the base 11 toward the end 13 of the elastic portion 10 in an unloaded state. That is, the second surfaces 21b of the pair of opposing surfaces 21 are formed in a flared shape such that the distance between them increases from the base 11 toward the end 13. The unloaded state means a state in which no load is applied to the elastic portion 10 and it extends linearly in the X direction.

[0025] The curved shape of the second surface 21b is formed into a shape that allows the elastic portion 10 to bend only within the range of elastic deformation. In other words, the curved shape of the second surface 21b is set into a shape that makes contact with the elastic portion 10 that is bent in the elastic region (primary rigidity). Note that in the no-load state, the elastic portion 10 is supported by the first surfaces 21a of the pair of opposing surfaces 21, but does not make contact with the second surfaces 21b of either of the opposing surfaces 21.

[0026] On the other hand, when the relative distance between the first structure 41 and the second structure 42 decreases, a load caused by this change in relative distance acts on the end portion 13. As shown in FIG. 3, the elastic portion 10 bends in response to the load and comes into contact with the second surface 21b of the opposing surface 21, which is located forward in the load direction indicated by the arrow. When this load gradually increases and reaches a predetermined threshold, the elastic portion 10 bends to the maximum and comes into contact with the entire surface of the second surface 21b. Even in this state, the displacement of the elastic portion 10 (i.e., the relative displacement between the first structure 41 and the second structure 42) is within the primary rigidity region (elastic region) shown in FIG. 4. Therefore, when the load is released, the elastic portion 10 returns to its original shape.

[0027] As the load increases (i.e., the more it bends in the Y direction), the region R (see FIG. 3) where the elastic portion 10 comes into contact with the second surface 21b expands from the boundary between the first surface 21a and the second surface 21b as a base point toward the end portion 13. In other words, if the elastic portion 10 is viewed as a cantilever, the fulcrum P of the cantilever moves toward the end portion 13 as the load increases. In FIG. 3, the fulcrum P in the no-load state is represented by a white circle, and the fulcrum P in the loaded state is represented by a black circle, indicating the movement of the fulcrum P due to the load.

[0028] Such deformation of the elastic part 10 also occurs when the relative distance between the first structure 41 and the second structure 42 increases and a load in the direction opposite to the Y direction is applied to the end 13 of the elastic part 10. Therefore, the elastic part 10 functions as a spring whose spring constant changes according to an increase or decrease in the load by the first structure 41, and relative displacement between the first structure 41 and the second structure 42 is permitted. In other words, when a load equal to or less than the load that causes the elastic part 10 to contact the entire surface of the second surface 21b is applied, the restoring force of the displacement suppression device 1A has the characteristics of primary rigidity.

[0029] On the other hand, when the end 13 of the elastic portion 10 receives a load from the first structure 41 that is greater than or equal to the load that would cause the flexible portion 12 to contact the entire surface of the second surface 21b, the flexible portion 12 cannot bend further. Therefore, the flexible portion 12 undergoes almost no substantial deformation, and the relative displacement between the first structure 41 and the second structure 42 is suppressed. In other words, when the elastic portion 10 receives a load that exceeds the load that would cause the flexible portion 10 to contact the entire surface of the second surface 21b, the elastic portion 10 bends so that it contacts the entire surface of the second surface 21b and cannot bend any further. In other words, the deformation (deflection) of the elastic portion 10 is limited, and the restoring force of the displacement suppression device 1A exhibits the characteristics of the hardening region shown in FIG. 4. As a result, the resistance to relative displacement by the displacement suppression device 1A increases, and excessive relative displacement between the first structure 41 and the second structure 42 can be suppressed.

[0030] When the displacement suppression device 1A according to this embodiment is applied to the seismic control mechanism 50 shown in FIG. 1A, when a relatively small earthquake occurs, the displacement suppression device 1A operates in the primary stiffness region. Although the displacement suppression device 1A and the braces 52 also contribute to suppressing the deformation of the frame, the majority of the contribution to suppression is made by the structure (e.g., a rigid frame) consisting of the beams 51 and columns 54. On the other hand, when a relatively large earthquake occurs, the displacement suppression device 1A intermittently operates in the hardening characteristic region. In this region, the resistance of the displacement suppression device 1A to the relative displacement increases, and the contribution of each brace 52 to suppressing the deformation of the frame increases. In other words, when the deformation of the frame progresses to a state where the displacement suppression device 1A operates in the hardening characteristic region (in other words, when the magnitude of the building's shaking increases), the contribution of the braces 52 to suppressing the deformation (swaying) increases. Therefore, the timing at which the plastic deformation of each brace 52 progresses is likely to be limited to when the deformation of the frame is large, and the progress of the plastic deformation can be slowed. Furthermore, since the progress of the plastic deformation of each brace 52 is slowed, the progression of the building's natural period becoming longer can also be slowed.

[0031] When the displacement suppression device 1A according to this embodiment is used in combination with the seismic isolation device 63 shown in FIG. 1B, when a relatively small earthquake occurs, the displacement suppression device 1A operates in the primary stiffness region, elastically supporting the building 60 without interfering with the operation of the seismic isolation device 63, which is primarily responsible for suppressing shaking. On the other hand, when a relatively large earthquake occurs, the displacement suppression device 1A intermittently operates in the hardening characteristic region described above. In this region, the increased resistance of the displacement suppression device 1A limits excessive displacement of the building 60 relative to the foundation 62. In other words, the displacement suppression device 1A functions as a fail-safe to prevent the building from colliding with a retaining wall 64 or the like. Furthermore, because it operates in the primary stiffness region, if the seismic isolation device 63 has a seismic control function, the vibration damping function of the seismic isolation device 63 can also be maintained.

[0032] [Second embodiment] Next, a second embodiment of the present disclosure will be described. In the second embodiment, the elastic portion 10 of the first embodiment, which is made of a solid member, is made of a plurality of plate members 14 stacked in the Y direction, which is the second direction. The other configurations are the same as those of the first embodiment. FIG. 5 is a side view illustrating a displacement suppression device 1B according to the second embodiment. FIG. 5 illustrates a state in which a load is applied to the elastic portion 10 of the displacement suppression device 1B.

[0033] As described above, the elastic portion 10 of the displacement suppression device 1B according to the second embodiment is composed of a plurality of plate materials 14 stacked in the Y direction, which is the second direction. The plate materials 14 have a thickness thinner than the thickness of the elastic portion 10 along the Y direction, and extend in the X and Z directions.

[0034] Two adjacent plate materials 14 in the Y direction are not bonded together so that each plate material 14 can bend individually in response to the load from the first structure 41. This allows each plate material 14 to bend to approximately the same shape, preventing the tensile stress and compressive stress caused by bending of the elastic portion 10 from being unevenly distributed on one side or the other in the Y direction. This makes it possible to suppress a decrease in the yield point.

[0035] According to the second embodiment, the rigidity (elastic force) of the elastic portion 10 can be easily adjusted by adjusting the number of plate materials 14. Furthermore, the multiple plate materials 14 are stacked in the Y direction without being bonded to each other. Therefore, each plate material 14 can bend to approximately the same shape. Therefore, compared to when the elastic portion 10 is configured from a single solid member, the tensile stress and compressive stress caused by bending can be distributed to each plate material. Therefore, excessive increases in tensile stress and compressive stress can be suppressed, and a decrease in the yield point of the elastic portion 10 can be suppressed.

[0036] [Third embodiment] Next, a third embodiment of the present disclosure will be described. Fig. 6 is a side view illustrating a displacement suppression device 1C according to the third embodiment.

[0037] As shown in Fig. 6, the second surfaces 21b of the opposing surfaces 21 in the third embodiment are provided on both sides of the first surface 21a in the X direction, which is the first direction. In other words, the pair of opposing surfaces 21 in the first or second embodiment are arranged in a plane-symmetric relationship with respect to an imaginary plane perpendicular to the first surface 21a. Therefore, the pair of opposing surfaces 21 are formed as convex surfaces that protrude toward each other. However, the first surface 21a that supports the base 11 is formed at the center of each opposing surface 21 in the X direction. Therefore, this portion is a plane parallel to the X direction (in other words, perpendicular to the Y direction).

[0038] The elastic member 10 according to the third embodiment has end portions 13 on both sides in the X direction, and the base portion 11 is located midway between these end portions 13. Therefore, the elastic member 10 receives the load from the first structure 41 from both sides (i.e., the two end portions 13).

[0039] The third embodiment also provides the same effects as the first and second embodiments. Furthermore, since the elastic member 10 according to the third embodiment receives loads on both sides in the X direction, the moments due to the loads are offset, thereby suppressing rotation of the displacement suppression device. Furthermore, since the load is received at two locations, the thickness of the elastic member 10 along the Y direction can be made thinner than that of the elastic member according to the first embodiment. Alternatively, the allowable value of the load received by the elastic member 10 can be increased.

[0040] 6 is made up of a plurality of plate materials 14 stacked in the Y direction, similar to the elastic portion of the second embodiment. However, as long as the desired restoring force characteristics are obtained, the elastic portion 10 of this embodiment may be made up of a single solid member, similar to the elastic portion of the first embodiment.

[0041] [Fourth embodiment] Next, a fourth embodiment will be described. Fig. 7A is a top view illustrating a displacement suppression device 1D according to the fourth embodiment, and Fig. 7B is a side view illustrating a displacement suppression device 1B.

[0042] 7A, in the fourth embodiment, the elastic portions 10 and the restraining portions 20 are considered to be one group 30. The group 30 is paired and arranged in a plane-symmetric relationship with respect to a second imaginary plane 36 (see FIG. 7A) that is perpendicular to a first imaginary plane 35 (see FIG. 7B) that includes the X direction as a first direction and the Y direction as a second direction and that intersects with the X direction.

[0043] Therefore, the displacement suppression device 1D according to the fourth embodiment is configured by arranging the elastic portion 10 and the pair of opposing surfaces 21 in the first embodiment in a plane-symmetric relationship on both sides of the second imaginary plane .

[0044] In other words, when the X and Y directions are defined for each group 30, the X directions of the respective groups are inclined with respect to the second imaginary plane 36 at inclination angles that are opposite to each other and have the same absolute value. The same is true for the Y direction. Therefore, the two elastic portions 10 are inclined with respect to the second imaginary plane 36 at inclination angles that are opposite to each other and have the same absolute value. In addition, the bases 11 of the two elastic portions 10 are integrally formed. Therefore, the two elastic portions 10 form a V-shape that opens at an angle that is twice the inclination angle θ.

[0045] The elastic portion 10 of the fourth embodiment may be formed by a solid rod-shaped member, or may be configured by a plurality of plate materials (not shown) stacked in the Z direction.

[0046] Similar to the elastic portion 10, the two pairs of opposing surfaces 21 are also inclined at an inclination angle θ that is opposite to each other and has the same absolute value with respect to the second imaginary plane 36. Of the two pairs of opposing surfaces 21, the first surfaces 21a of the two opposing surfaces 21 that are in a plane-symmetric relationship are connected to each other on the second imaginary plane 36.

[0047] The two pairs of opposing surfaces 21 according to the fourth embodiment are formed as side surfaces of a groove 24 of the restraint portion 20 that houses the two elastic portions 10. The groove 24 also has a V-shape that opens at an angle twice the inclination angle θ.

[0048] The load from the first structure 41 is applied to the end 13 of each elastic portion 10 in a direction parallel to the second imaginary plane 36. On the other hand, the extension direction (i.e., the X direction) of the flexible portion 12 of each elastic portion 10 is inclined with respect to the load direction. Therefore, in order to appropriately transmit the load to the flexible portion 12, the end 13 of each elastic portion 10 extends from the flexible portion 12 in a direction parallel to the second imaginary plane 36.

[0049] The first structure 41 is connected to the ends 13 of the two elastic portions 10 via predetermined joints 43. The joints 43 are configured so as not to interfere with the deflection of the elastic portions 10 in the Y direction and the opposite direction. The second structure 42 is connected to the restraint portion 20 on the opposite side of the first structure 41 with the restraint portion 20 in between.

[0050] The flexible portions 12 of the two elastic members 10 bend toward or away from each other depending on the load. For example, when the elastic members 10 receive a load in the right direction, as indicated by the solid arrow in Fig. 7A, the elastic members 10 bend in the Y direction, as indicated by the two-dot chain line, as they move away from each other. Conversely, when the elastic members 10 receive a load in the left direction, as indicated by the dashed arrow in Fig. 7A, the elastic members 10 bend in the direction opposite to the Y direction, as indicated by the dotted line, as they move toward each other.

[0051] However, similar to the above-described embodiments, when the load exceeds a predetermined threshold, the deflection is limited and the displacement of the first structure 41 relative to the second structure 42 is limited. Therefore, the fourth embodiment also provides the same effect as the first embodiment. Furthermore, in the fourth embodiment, the load is received at two locations, similar to the second embodiment. In the fourth embodiment, the same effect as the second embodiment due to the multiple elastic portions 10 is also provided.

[0052] [Fifth embodiment] Next, a fifth embodiment will be described. Fig. 8A is a top view illustrating a displacement suppression device 1E according to the fifth embodiment, and Fig. 8B is a side view illustrating the displacement suppression device 1E.

[0053] As shown in FIG. 8A, in the fifth embodiment, the pair of groups 30 assumed in the fourth embodiment are arranged in a plane-symmetric relationship with respect to a third imaginary plane 37 that is perpendicular to the first imaginary plane 35 and the second imaginary plane 36.

[0054] Therefore, the displacement suppression device 1E according to the fifth embodiment is configured by arranging the elastic member 10 and the pair of opposing surfaces 21 in the first embodiment in a plane-symmetric relationship on both sides of the second imaginary plane 36, and further arranging them in a plane-symmetric relationship on both sides of the third imaginary plane. In addition, the bases 11 of the four elastic members 10 are integrally formed. Therefore, the four elastic members 10 form a substantially X-shape.

[0055] As in the fourth embodiment, the elastic portion 10 of the fifth embodiment may be formed by a solid rod-shaped member, or may be configured by a plurality of plate materials (not shown) stacked in the Z direction.

[0056] Two pairs of opposing surfaces 21 on each side of the third imaginary plane 37 are inclined at an inclination angle θ that is opposite to each other and has the same absolute value with respect to the second imaginary plane 36. Furthermore, one first surface 21a of each pair of opposing surfaces 21 is connected to the corresponding first surface 21a of the adjacent pair of opposing surfaces 21 that is plane-symmetrical with respect to the second imaginary plane 36, via the second imaginary plane 36. Furthermore, the other first surface 21a of each pair of opposing surfaces 21 is connected to the corresponding first surface 21a of the adjacent pair of opposing surfaces 21 that is plane-symmetrical with respect to the third imaginary plane 37, via the third imaginary plane 37.

[0057] The four pairs of opposing surfaces 21 according to the fifth embodiment are formed as side surfaces of a groove 24 of a restraining portion 20 that houses four elastic portions 10. Therefore, the groove 24 also has a substantially X-shape.

[0058] The first structure 41 is connected to the ends 13 of the two elastic portions 10 located on one side of the third imaginary plane 37 via predetermined joints 43. Similarly, the second structure 42 is connected to the ends 13 of the two elastic portions 10 located on the other side of the third imaginary plane 37 via predetermined joints 43.

[0059] The restraint unit 20 according to the fifth embodiment is not connected to either the first structure 41 or the second structure 42. Alternatively, the restraint unit 20 is attached to the first structure 41 or the second structure 42 via a damper, spring, or the like so as not to be displaced in synchronization with the displacement of the first structure 41 or the second structure 42.

[0060] On both sides of the third imaginary plane 37, the flexible portions 12 of the two elastic units 10 bend toward or away from each other depending on the load. For example, when the elastic unit 10 receives a load in a direction in which the first structure 41 and the second structure 42 move toward each other (the direction indicated by the solid arrow), the elastic units 10 bend in the Y direction so as to move away from each other, as indicated by the two-dot chain line. Conversely, when the elastic unit 10 receives a load in a direction in which the first structure 41 and the second structure 42 move away from each other (the direction indicated by the dashed arrow), the elastic units 10 bend in the direction opposite to the Y direction so as to move toward each other, as indicated by the dotted line.

[0061] However, similarly to the above-described embodiments, when the load exceeds a predetermined threshold, the deflection is limited, and the displacement of the first structure 41 relative to the second structure 42 is limited. Therefore, the fifth embodiment also provides the same effects as the first embodiment. Moreover, in the fifth embodiment, the load is received at four locations. The fourth embodiment also provides the same effects as the second embodiment, which are achieved by using the multiple elastic portions 10.

[0062] The displacement suppression device of each embodiment may be used singly or in multiple units. In the latter case, depending on the specifications, multiple displacement suppression devices may be connected in series with respect to the load direction or arranged in parallel in a direction perpendicular to the load direction. Furthermore, multiple displacement suppression devices connected in series may be arranged in multiple units in a direction perpendicular to the load direction. Furthermore, the displacement suppression device of each embodiment is not limited to application to earthquake-resistant structures such as seismic isolation and vibration control, but can also be applied to other devices and equipment that suppress excessive displacement. [Explanation of symbols]

[0063] 1, 1A~1E Displacement control device 10 Elastic part 11 Base 12 Flexible part 13 End 14 Board material 20 Restraint part 21 Opposite surface 21a 1st page 21b 2nd side 22 Board part 23 Fastening members 24 groove 30 groups 35 First virtual surface 36 Second virtual plane 37 Third Virtual Plane 41 First structure 42 Second structure 43 Joint 50 Vibration control mechanism 51 Beam 52 Brace (diagonal member) 53 Connecting part 54 pillars 60 Buildings 61 Beam 62 Basics 63 Seismic isolation device 64 Retaining Wall

Claims

1. an elastic portion that extends in a first direction and is flexible in a second direction perpendicular to the first direction and in a direction opposite to the second direction; a restraining portion including a pair of opposing surfaces located on both sides of the elastic portion in the second direction and opposing each other in the second direction; Equipped with Each of the opposing surfaces is a first surface supporting a base of the elastic portion; a second surface that is spaced apart from the elastic portion from the base of the elastic portion that receives the load toward an end of the elastic portion, A displacement suppression device for a structure, wherein the second surface has a curved shape that allows the elastic portion to deflect only within a range of elastic deformation.

2. The second surfaces are provided on both sides of the first surface in the first direction. The displacement suppression device according to claim 1 .

3. The elastic portion is configured by a plurality of plate materials stacked in the second direction. The displacement suppression device according to claim 1 or 2.

4. The group of the elastic portion and the group of the restraint portion are provided in a plane-symmetric relationship with respect to a second imaginary plane that is orthogonal to a first imaginary plane including the first direction and the second direction and intersects with the first direction, and form pairs. The displacement suppression device according to claim 1 .

5. The pairs of the groups are further arranged in a plane-symmetric relationship with respect to a third imaginary plane that is orthogonal to the first imaginary plane and the second imaginary plane. The displacement suppression device according to claim 4.

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