Shear force absorbing member and seismic-resistant structure

Abstract

To provide highly durable shear force absorbing members and seismic-resistant structures. [Solution] The shear force absorbing member 1 comprises a plate-shaped absorbing part 2 bent into a U shape, and a separation prevention part 3 located inside the U shape of the absorbing part 2. The separation prevention part 3 has a pair of rail parts 30, 30 that lock together a pair of flat plate parts 20, 20 so that the distance between one flat plate part 20 and the other flat plate part 20 of the absorbing part 2 does not increase. The rail part 30 is located inside the U shape of the absorbing part 2 on one of the flat plate parts 20. It is a plate-shaped part that extends from the surface and whose plate surface is aligned with the direction of extension of the flat plate part 20, and has a base end portion 51 supported by one flat plate part 20 and a hook-shaped portion 52 in the shape of the letter J that is positioned at the end on the side closer to the other flat plate part 20 and is folded back toward the side closer to the flat plate part 20, and in the pair of rail parts 30, 30, the hook-shaped portion 52 of one rail part 30 interlocks with the hook-shaped portion 52 of the other rail part 30.

Description

Technical Field

[0001] The present invention relates to a shear force absorbing member and a seismic structure.

Background Art

[0002] Patent Document 1 discloses a seismic structure. This seismic structure includes an upper horizontal member, a lower horizontal member, and a pair of energy absorbing members provided between the upper horizontal member and the lower horizontal member. This energy absorbing member has a curved portion, a pair of intermediate portions continuously extending from both ends of the curved portion, and a pair of fixing portions continuously extending from the ends of the pair of intermediate portions, and has a U shape. This energy absorbing member is configured such that relative displacement in the extending direction occurs in the pair of fixing portions in response to the horizontal relative displacement between the upper horizontal member and the lower horizontal member. Further, the pair of energy absorbing members are sandwiched in a state where the curved portions face each other by a pair of sandwiching portions.

[0003] Patent Document 2 discloses a shear force absorbing member and a seismic structure. This shear force absorbing member includes a plate-shaped absorbing portion having a U shape when viewed from the front, and a separation preventing portion disposed inside the U shape of the absorbing portion. The separation preventing portion locks one flat plate portion to the other flat plate portion so that the distance between one flat plate portion extending from one end of the curved portion and the other flat plate portion extending from the other end of the curved portion in the U shape of the absorbing portion does not increase.

[0004] Patent Document 2 illustrates a case in which the separation prevention part is composed of a pair of L-shaped rail sections that are arranged on the inner surface of the U-shaped absorption section of the flat plate section, extending from one flat plate section toward the other flat plate section, with the end closer to the other flat plate section folding back toward the side closer to the first flat plate section, forming a shape resembling the Japanese katakana character "レ" (a shape bent at a sharper angle than the alphabetical L-shape, a more angular L-shape). Furthermore, it illustrates a case in which the L-shaped tip portion of the L-shaped rail section has an expanded portion that widens in the width direction of the absorption section toward the side closer to the first flat plate section than the base side, thereby forming the L-shape. The separation prevention part is configured such that the pair of L-shaped rail sections interlock and slide together, while preventing the distance between the plate surfaces of the pair of flat plates from increasing. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2021-161764 [Patent Document 2] Japanese Patent Publication No. 2024-127723 [Overview of the project] [Problems that the invention aims to solve]

[0006] In conventional shear force absorbing members and seismic-resistant structures that use a U-shaped energy absorbing member, as illustrated in the disclosure of Patent Document 1 above, when attempting to absorb the shear force caused by displacement in the seismic-resistant structure with the absorbing member, the distance between the pair of U-shaped flat plates in the absorbing member tends to widen. Therefore, it was sometimes difficult to further enhance the shear force absorbing capacity of the shear force absorbing member.

[0007] The shear force absorbing member disclosed in Patent Document 2 has a high capacity to absorb shear force. However, although this shear force absorbing member prevents the distance between the flat plate sections from increasing by a separation prevention section, in a structure in which L-shaped or V-shaped rail sections interlock, the bent portion of the L-shaped or V-shaped rail section may open up (deforming so that the angle on the inside of the L-shape increases), and there were cases where the force trying to spread the flat plate sections apart could not be adequately absorbed. In other words, the durability as a shear force absorbing member was sometimes insufficient. Therefore, there is a need to provide a shear force absorbing member and seismic-resistant structure with high durability.

[0008] This invention has been made in view of the above circumstances, and its purpose is to provide a highly durable shear force absorbing member and an earthquake-resistant structure. [Means for solving the problem]

[0009] The shear force absorbing member according to the present invention, for achieving the above objective, A plate-shaped absorbent section bent into a U-shape, The absorption section comprises a separation prevention section arranged inside the U-shape, The separation prevention section has a pair of rail sections on each of the pair of flat sections that lock together the pair of flat sections so that the distance between the flat section extending from one end of the curved section in the U-shape of the absorption section and the other flat section extending from the other end of the curved section does not increase. The aforementioned rail section is In the flat plate portion, the plate extends from the inner surface of the U-shaped absorption portion, and the plate surface is aligned with the direction of extension of the flat plate portion. One of the flat plate portions is supported by a base end, It has a hook-shaped portion in the shape of the letter J, which is positioned at the end of the other flat plate portion that is close to the other flat plate portion and is folded back toward the side that is close to the first flat plate portion, In the pair of rail sections, the hook-shaped portion of one rail section engages with the hook-shaped portion of the other rail section.

[0010] In the shear force absorbing member according to the present invention, The rail portion is arranged along the extending direction of the flat plate portion, and in a pair of rail portions, the other rail portion may be slidable along one of the rail portions.

[0011] In the shear force absorbing member according to the present invention, The valleys in the J-shaped form of the hook-shaped portion may be aligned with the direction of extension of the flat plate portion.

[0012] In the shear force absorbing member according to the present invention, The separation prevention section may have two or more sets of rail sections.

[0013] In the shear force absorbing member according to the present invention, The rail portion may be inclined with respect to the direction normal to the surface of the flat plate portion.

[0014] In the shear force absorbing member according to the present invention, The base ends of each of the rail sections that make up the pair may be located on the same plane along the normal direction of the flat plate section.

[0015] In the shear force absorbing member according to the present invention, The rail portion may have a plate thickness of less than 2.3 mm.

[0016] In the shear force absorbing member according to the present invention, The aforementioned absorption section is provided in a pair, The pair of absorbent portions may be arranged on the same virtual plane with their tops facing each other.

[0017] The earthquake-resistant structure according to the present invention, for achieving the above objective, The above-mentioned shear force absorbing member, Equipped with a pair of structures, The shear force absorbing member has one flat plate portion supported by one of the structures, and the other flat plate portion supported by the other structure.

[0018] In the seismic structure according to the present invention, it further includes a plate-shaped support portion, wherein the support portion is arranged such that the plate surface intersects the flat plate portion and is along the extending direction of the flat plate portion, and is supported by the structure body, the absorbing portion may be supported by the support portion on the outer side of the U-shaped absorbing portion in the flat plate portion.

Advantages of the Invention

[0019] According to the present invention, it is possible to provide a shear force absorbing member and a seismic structure with high durability.

Brief Description of the Drawings

[0020] [Figure 1] It is a front view of the seismic structure of the first embodiment. [Figure 2] It is a side view of the seismic structure of the first embodiment. [Figure 3] It is a top view of the seismic structure of the first embodiment. [Figure 4] It is a perspective view of the shear force absorbing member of the first embodiment seen obliquely from above. [Figure 5] It is a side view of the absorbing portion. [[ID= forty-one ]] [Figure 6] It is a top view of the shear force absorbing member of the first embodiment. [Figure 7] It is a diagram for explaining the mode of shear force absorption in the seismic structure. [Figure 8] It is a diagram for explaining the mode of shear force absorption by the absorbing portion. [Figure 9] It is a front view of the seismic structure in Modification 1 of the first embodiment. [Figure 10] It is a front view of the seismic structure in Modification 2 of the first embodiment. [Figure 11] It is a front view of the seismic structure in Modification 3 of the first embodiment. [Figure 12] It is a front view of the seismic structure of the second embodiment. [Figure 13] This is a front view of the seismic-resistant structure in Modification 1 of the second embodiment. [Figure 14] This is a front view of the seismic-resistant structure in a modified example 2 of the second embodiment. [Figure 15] This is a front view of the seismic-resistant structure in modified example 3 of the second embodiment. [Figure 16] This is a perspective view of another shear force absorbing member, seen from diagonally above. [Figure 17] This is a perspective view of a shear force absorbing member of another embodiment, seen from diagonally above. [Figure 18] This is a top view of another absorption section. [Figure 19] This is a top view of another absorption section. [Figure 20] This is a top view of another absorption section. [Modes for carrying out the invention]

[0021] Based on the drawings, a shear force absorbing member and an earthquake-resistant structure according to an embodiment of the present invention will be described.

[0022] (First Embodiment) Figures 1 to 3 show the shear force absorbing member 1 and the seismic-resistant structure 100 equipped with the shear force absorbing member 1 according to this embodiment. Figure 4 shows details of the shear force absorbing member 1. Figures 1, 2, and 3 are the front view, side view, and top view of the seismic-resistant structure 100, respectively.

[0023] As shown in Figure 4, the shear force absorbing member 1 according to this embodiment comprises a plate-shaped absorbing portion 2 bent into a U shape, and a separation prevention portion 3 located inside the U shape of the absorbing portion 2. The separation prevention portion 3 has a pair of rail portions 30, 30 on each of the pair of flat portions 20, 20 that lock together the pair of flat portions 20, 20 so that the distance between the flat portion 20 extending from one end of the curved portion 29 of the U shape of the absorbing portion 2 and the other flat portion 20 extending from the other end of the curved portion 29 does not increase. The rail section 30 is plate-shaped, extending from the U-shaped inner surface of the absorption section 2 on one of the flat plate sections 20, and with its plate surface aligned in the direction of extension of the flat plate section 20. It has a base end 51 supported by one of the flat plate sections 20, and a hook-shaped portion 52 in the shape of the letter J, located at the end adjacent to the other flat plate section 20 and folded back toward the side adjacent to the flat plate section 20. In the pair of rail sections 30, 30, the hook-shaped portion 52 of one rail section 30 interlocks with the hook-shaped portion 52 of the other rail section 30.

[0024] As shown in Figure 1, the seismic-resistant structure 100 according to this embodiment comprises a shear force absorbing member 1 and a pair of vertical frames 8, 8, wherein the absorbing portions 2, 2 of the shear force absorbing member 1 are supported by one vertical frame 8 at one flat plate portion 20 and by the other vertical frame 8 at the other flat plate portion 20.

[0025] The shear force absorbing member 1 and the seismic-resistant structure 100 can better absorb the shear force generated between the vertical frames 8, 8 along the direction of extension of the vertical frame 8. Furthermore, the shear force absorbing member 1 and the seismic-resistant structure 100 are highly durable.

[0026] The shear force absorbing member 1 and the seismic-resistant structure 100 will be described in detail below.

[0027] Seismic-resistant structure 100 can be used, for example, as the structure of a building's walls. The building may consist of a reinforced concrete foundation, a frame structure composed of framing members such as columns and beams, and panels forming walls, floors, etc., and a superstructure fixed to the foundation. The framing members and panels can be pre-standardized. In this case, the framing members and other components can be manufactured in advance at a factory and transported to the construction site for assembly. Seismic-resistant structure 100 may be incorporated as part of a newly constructed building, or it may be added to an existing building.

[0028] The seismic-resistant structure 100 is a rectangular frame comprising a pair of vertical frames 8,8, another pair of horizontal frames 9,9, and a shear force absorbing member 1. In buildings, the seismic-resistant structure 100 can be used to construct so-called load-bearing walls.

[0029] The vertical frames 8,8 are, for example, column sections 81, 82 whose extension direction is aligned vertically (same as the vertical direction). Column sections 81 and 82 are arranged parallel to each other.

[0030] The horizontal frames 9,9 are, for example, an upper beam 91 and a lower beam 92 whose extension direction is aligned horizontally. The upper beam 91 and the lower beam 92 are arranged parallel to each other.

[0031] The column sections 81 and 82, the upper beam 91, and the lower beam 92 form a rectangular frame structure, which is an earthquake-resistant structure 100.

[0032] In this embodiment, the downward direction in the vertical direction, which is the same direction as the vertical direction, will be simply referred to as "down," and the upward direction will be simply referred to as "up." For example, the lower beam 92 is positioned below the upper beam 91. Also, the direction from column 81 to column 82 will be referred to as "right," and the direction from column 82 to column 81 will be referred to as "left." For example, in the illustration in Figure 1, the vertical frame 8 on the left side of the figure is column 81, and the vertical frame 8 on the right side is column 82. Also, in this embodiment, the viewpoint from above looking downwards will be referred to as a top view, and the viewpoint in the left-right direction will be referred to as a side view. Furthermore, the direction perpendicular to the virtual plane that overlaps with column 81, column 82, upper beam 91, and lower beam 92 (hereinafter referred to as the virtual plane of the seismic-resistant structure 100) will be referred to as the depth direction. Furthermore, when viewing the seismic-resistant structure 100 along the depth direction, the side where the column 81 is on the left is referred to as the front side in the depth direction, and the side where the column 81 is on the left is referred to as the back side in the depth direction. In addition, the viewpoint from which the structure is viewed from the front side to the back side in the depth direction is referred to as the front view. For example, the column 81, column 82, upper beam 91, and lower beam 92 form a rectangular frame in the front view.

[0033] The shear force absorbing member 1 may, for example, be supported by column 81 and column 82. The shear force absorbing member 1 is positioned within the area enclosed by column 81, column 82, upper beam 91, and lower beam 92.

[0034] In this embodiment, the shear force absorbing member 1 is positioned on a virtual plane of the seismic-resistant structure 100. In other words, as shown in Figure 2, in a side view of the seismic-resistant structure 100 from the left side (the side of the column 81), the shear force absorbing member 1 overlaps with the column 81 and column 82 (see Figure 1), and the shear force absorbing member 1 is in the same position as the virtual plane of the seismic-resistant structure 100 in the depth direction. Also, as shown in Figure 3, in a top view of the seismic-resistant structure 100, the shear force absorbing member 1 overlaps with the upper beam 91 and lower beam 92 (see Figure 1), and the shear force absorbing member 1 is in the same position as the virtual plane of the seismic-resistant structure 100 in the depth direction. By positioning the shear force absorbing member 1 in this way, the thickness of the load-bearing wall constructed by the seismic-resistant structure 100 can be kept thin.

[0035] In this embodiment, as shown in Figure 1, in the seismic-resistant structure 100, the shear force absorbing member 1 is supported on its left side by a column 81 and on its right side by a column 82.

[0036] The shear force absorbing member 1 may be supported by the column sections 81 and 82 via a plurality of frame members. For example, the shear force absorbing member 1 may be supported by the column section 81 via frame members 71, 72, and 73 which are supported by the column section 81. Alternatively, the shear force absorbing member 1 may be supported by the column section 82 via frame members 75, 76, and 77 which are supported by the column section 82.

[0037] Frame members 71, 72, 73, 75, 76, and 77 may be straight (rod-shaped). Frame members 71, 72, and 73 are supported at one end by column 81 and support the shear force absorbing member 1 at the other end. Frame members 75, 76, and 77 are supported at one end by column 82 and support the shear force absorbing member 1 at the other end. Hereafter, frame members such as frame members 71, 72, 73, 75, 76, and 77 that support the shear force absorbing member 1 on column 81 and 82 may be collectively referred to as support frames, etc.

[0038] Frame members 71, 72, 73 and frame members 75, 76, 77 may be arranged along the column sections 81, 82 and fixed to the column sections 81, 82 via auxiliary frames 81a, 82a fixed to the column sections 81, 82.

[0039] Frame member 71 is a diagonal member that extends in a downward and rightward inclination from the side supported by the column 82 to the side supporting the shear force absorbing member 1. Frame member 72 is a horizontal member that extends horizontally from the side supported by the column 82 to the side supporting the shear force absorbing member 1. Frame member 73 is a diagonal member that extends in a rightward inclination from the side supported by the column 82 to the side supporting the shear force absorbing member 1.

[0040] Frame member 75 is a diagonal member that extends in a downward and leftward direction from the side supported by the column 82 to the side supporting the shear force absorbing member 1. Frame member 76 is a horizontal member that extends horizontally from the side supported by the column 82 to the side supporting the shear force absorbing member 1. Frame member 77 is a diagonal member that extends in a upward and leftward direction from the side supported by the column 82 to the side supporting the shear force absorbing member 1.

[0041] In this embodiment, as shown in Figures 1 and 4, the shear force absorbing member 1 comprises plate-shaped absorbing portions 2, 2 bent into a U-shape when viewed from the front, separation prevention portions 3, 3 located inside the U-shape of the absorbing portion 2, a first support portion 41 which supports the shear force absorbing member 1 on the column portion 81 (see Figure 1), and a second support portion 42 which supports the shear force absorbing member 1 on the column portion 82 (see Figure 1). Figure 4 is a perspective view of the shear force absorbing member 1 viewed from diagonally above. In Figure 4, as an example, the case in which the shear force absorbing member 1 is symmetrical in the vertical direction. The shear force absorbing member 1 may be made of metal such as steel or an iron alloy such as stainless steel.

[0042] As shown in Figure 1, the absorption section 2 is an energy absorption mechanism that absorbs, buffers, or reduces the speed of relative movement of the column sections 81 and 82 as they move relative to each other along their extension direction.

[0043] The absorbent portion 2 is formed by bending a rectangular plate-shaped member so that the plate surface at one end of the plate-shaped member faces the plate surface at the other end. In other words, the absorbent portion 2 is formed in a U-shape when viewed from the front, and has a semicircularly curved portion 29, a flat plate portion 20 extending from one end of the curved portion 29, and a flat plate portion 20 extending from the other end of the curved portion 29. The plate-shaped member forming the absorbent portion 2 may be a single (single) member, or it may be a stack of multiple (two or more) members.

[0044] In the absorption section 2, its plate surface may be arranged to be perpendicular to the virtual plane of the seismic-resistant structure 100. In this embodiment, the curved section 29 and the flat sections 20, 20 are perpendicular to the virtual plane of the seismic-resistant structure 100.

[0045] The absorption section 2 may be positioned on a virtual plane of the seismic-resistant structure 100. In this embodiment, the curved section 29 and the flat sections 20, 20 are positioned on a virtual plane of the seismic-resistant structure 100.

[0046] The absorbent section 2 is fixed to the column sections 81 and 82 such that the extension direction of the flat plate section 20 is aligned with the extension direction of the column sections 81 and 82 (which is the same as the vertical direction in Figure 1). In other words, the flat plate sections 20, 20 are positioned along the column sections 81 and 82, respectively. The extension direction of the flat plate section 20 is the direction in which the flat plate section 20 extends from the curved section 29.

[0047] Of the two flat plate sections 20, 20, one flat plate section 20 is positioned close to the column section 81. Of the two flat plate sections 20, 20, the other flat plate section 20 is positioned close to the column section 82.

[0048] As shown in Figures 1 and 4, the shear force absorbing member 1 may be provided with a pair of absorbing parts 2,2. The absorbing parts 2,2 may be arranged, for example, along the vertical direction. In this embodiment, the absorbing parts 2,2 are arranged so that their curved parts 29,29 face each other. Specifically, the curved parts 29,29 form a pair, and the tops of this pair face each other. In other words, the U-shapes of the pair of absorbing parts 2,2 face opposite directions along the extending direction of the column part 81. The curved parts 29,29 may be in contact with each other or may be separated. In the following description, the upper absorbing part 2 will be described in detail. In this embodiment, the lower absorbing part 2 is the same as the upper absorbing part 2 with its top and bottom reversed.

[0049] As shown in Figure 1, the absorption section 2 may be supported by a first support section 41 and a second support section 42, respectively, for the flat plate sections 20, 20. The flat plate sections 20, 20 may be supported on the outside of the U-shape of the absorption section 2 by the first support section 41 and the second support section 42. Figure 1 shows the case where the first support section 41 supports the flat plate section 20 on the side closer to the column section 81 (left side), and the second support section 42 supports the flat plate section 20 on the side closer to the column section 82 (right side).

[0050] The first support portion 41 and the second support portion 42 may each be formed of a plate-shaped member whose plate surface intersects with the plate surface of the flat plate portion 20 and which is aligned with the extending direction of the flat plate portion 20 (the same as the extending direction of the column portion 81).

[0051] In this embodiment, the first support portion 41 may have a pair of plate-shaped members, the first support plates 41a and 41b, which overlap in the depth direction and are parallel to the virtual plane of the seismic-resistant structure 100. The second support portion 42 may have a pair of plate-shaped members, the second support plates 42a and 42b, which overlap in the depth direction and are parallel to the virtual plane of the seismic-resistant structure 100. The first support plates 41a and 41b and the second support plates 42a and 42b are rectangular in shape when viewed from the front, for example.

[0052] Figure 4 shows a case where the first support portion 41 has a first connecting plate 41c in addition to the first support plates 41a and 41b. The first connecting plate 41c is rectangular in shape with its longitudinal direction aligned with the extending direction of the flat plate portion 20, and is a plate-like member parallel to the U-shaped outer surface of the absorption portion 2 in the flat plate portion 20.

[0053] The ends of the first support plates 41a and 41b, respectively, that are closest to the absorption section 2 are connected to the respective ends of the first connecting plate 41c in the depth direction. When viewed from above, the first support section 41, consisting of the first support plates 41a, 41b and the first connecting plate 41c, forms an angular U-shape (like the Japanese character "コ"). In other words, the first support plates 41a and 41b are erected so as to extend along the left-right direction at their respective ends in the depth direction of the first connecting plate 41c.

[0054] The second support portion 42 may have second support plates 42a, 42b and a second connecting plate 42c, similar to the first support portion 41. The second support portion 42 may have an angular U-shape when viewed from above, similar to the first support portion 41.

[0055] The first support portion 41 may be formed, for example, by bending a single plate-shaped member to create the first support plate 41a, the first connecting plate 41c, and the first support plate 41b, or the first support plates 41a and 41b may be joined to both ends of the first connecting plate 41c by welding or other means. The second support portion 42 can also be made into an angular U-shape when viewed from above, similar to the first support portion 41.

[0056] Figure 4 illustrates a case in which the absorption section 2 is supported by the first support plates 41a, 41b and the second support plates 42a, 42b via the first connecting plate 41c and the second connecting plate 42c. The flat plate sections 20, 20 may be fixed and supported by the first connecting plate 41c and the second connecting plate 42c by welding, bolting, or other means.

[0057] The first support portion 41 and the second support portion 42 support the respective flat plate portion 20 at a position near the end opposite to the curved portion 29. In Figures 4, 5, and 6, the flat portion of the flat plate portion 20 on the side of the curved portion 29 is shown as the intermediate flat plate portion 20b, and the flat portion of the flat plate portion 20 at a position further than the intermediate flat plate portion 20b and further than the curved portion 29 (a position near the end opposite to the curved portion 29) is shown as the tip flat plate portion 20a. The absorption portion 2 may be supported at the tip flat plate portions 20a, 20a by the first support portion 41 and the second support portion 42. For example, the tip flat plate portions 20a, 20a may be fixed to the first connecting plate 41c and the second connecting plate 42c.

[0058] In this embodiment, the shear force absorbing member 1 is equipped with absorbing sections 2, 2, but the relative positions of each absorbing section 2 may be fixed. In the example shown in Figure 4, the pair of absorbing sections 2, 2 are supported as a pair by a single first support section 41 (first connecting plate 41c) with their respective left-side (the side closer to the column section 81 in Figure 1) flat plate sections 20, 20, and their relative positions are fixed. In addition, the pair of absorbing sections 2, 2 are supported as a pair by a single second support section 42 (second connecting plate 42c) with their respective right-side (the side closer to the column section 82 in Figure 1) flat plate sections 20, 20, and their relative positions are fixed.

[0059] As shown in Figure 1, the frame members 71, 72, and 73 may be fixed to the first support section 41 by welding or bolting, while being sandwiched between the first support plates 41a and 41b (see Figure 4) in the first support section 41. This fixes the absorbent section 2 to the column section 81. Fixing the absorbent section 2 to the column section 81 via the two plate-like members, the first support plates 41a and 41b, allows for a more robust fixation than when fixed with a single plate-like member. This improves the load-bearing capacity of the seismic-resistant structure 100.

[0060] Furthermore, the frame members 75, 76, and 77 may be fixed to the second support section 42 by welding or bolting while sandwiched between the second support plates 42a and 42b (see Figure 4) in the second support section 42. This fixes the absorption section 2 to the column section 82. Fixing the absorption section 2 to the column section 82 via the two plate-like members, the second support plates 42a and 42b, provides a more robust fixation than when fixed with a single plate-like member. This improves the load-bearing capacity of the seismic-resistant structure 100.

[0061] The separation prevention part 3 shown in Figure 4 is a locking member that locks one flat plate part 20 to the other flat plate part 20 so that the distance between the flat plate parts 20, 20 in the width direction of the U-shape of the absorption part 2 (the same as the left-right direction in Figure 1, and may hereafter be referred to as the width direction of the absorption part 2) does not increase (they do not separate in the width direction of the absorption part 2), while allowing the flat plate parts 20, 20 to move relative to each other along their extending direction.

[0062] The separation prevention section 3 is positioned between the flat plate sections 20, 20, that is, inside the U-shape of the absorption section 2. This prevents the thickness of the absorption section 2 from increasing in the depth direction, thereby preventing the thickness of the seismic-resistant structure 100 from increasing in the depth direction. When a load-bearing wall is formed in the seismic-resistant structure 100, the load-bearing wall can be thin yet have high load-bearing capacity. In the following description, the separation prevention section 3 positioned between the flat plate sections 20, 20 of the upper absorption section 2 will be mainly described with reference to it. In this embodiment, the separation prevention section 3 of the lower absorption section 2 is the same as the separation prevention section 3 of the upper absorption section 2, but inverted vertically.

[0063] An example of the separation prevention section 3 is a rail-like mechanism. Figures 4 to 6 illustrate the case where the separation prevention section 3 is a rail mechanism with a J-shaped rail section when viewed from above.

[0064] The separation prevention section 3 has a pair of rail sections 30, 30 on each of the pair of flat sections 20, 20 that lock together the pair of flat sections 20, 20 so that the distance between the flat section 20 extending from one end of the curved section in the U-shape of the absorption section 2 and the other flat section 20 extending from the other end of the curved section does not increase. In Figure 4, an example is shown where the separation prevention section 3 has one pair of rail sections 30, 30. For example, the rail section 30 has a J-shape when viewed from above, that is, when the absorption section 2 is viewed from above in its U-shape.

[0065] The rail section 30 extends from the U-shaped inner surface of the absorption section 2 on one of the flat plate sections 20, and is plate-shaped with its surface aligned in the direction of extension of the flat plate section 20. The rail section 30 is formed by bending a plate material, such as a steel plate, so that it has a J-shape when viewed from above.

[0066] The plate material forming the rail section 30 is preferably a steel plate, and its thickness is preferably less than 2.3 mm. If the plate material forming the rail section 30 is a steel plate, its thickness is preferably 1 mm or more. If the plate material forming the rail section 30 is a steel plate and its thickness is less than 2.3 mm, it is preferable because bending the plate material when forming the rail section 30 into a J-shape becomes easier. Furthermore, if the plate material forming the rail section 30 is a steel plate and its thickness is less than 2.3 mm, the rail section 30 will have sufficient durability.

[0067] The rail section 30 has a base end 51 supported by one of the flat plate sections 20 (for example, flat plate section 21), and a hook-shaped section 52 that is positioned at the end adjacent to the other flat plate section 20 (for example, flat plate section 22) and folds back toward the side adjacent to the flat plate section 20, forming a J-shape when viewed from above.

[0068] The hook-shaped portion 52 is supported by the flat plate portion 20 via the base end 51 at the base end 52a, which is closer to the base end 53 of the J-shaped valley portion 53. The flat plate portion 52a is erected on the surface (plate surface) of the flat plate portion 20, with its plate surface aligned with the extending direction of the flat plate portion 20. Figure 4 illustrates the case where the flat plate portion 52a is parallel to the extending direction of the flat plate portion 20. In Figure 4, the flat plate portion 52a is erected perpendicular to the surface of the flat plate portion 20 (the inner surface of the U-shape of the absorption portion 2), that is, it is erected parallel to the normal of the surface (plate surface) of the flat plate portion 20.

[0069] In the hook-shaped portion 52, the flat plate portion 52a on the base end side of the valley portion 53 and the flat plate portion 52b on the tip side of the valley portion 53 are parallel. In other words, the valley portion 53 of the hook-shaped portion 52 is a plate surface that has been bent at 180 degrees. In the J-shape of the hook-shaped portion 52, the valley portion 53 has its valley aligned with the direction of extension of the flat plate portion 20.

[0070] In the pair of rail sections 30, 30, the hook-shaped portion 52 of one rail section 30 (for example, the rail section 31 extending from the flat plate section 21) engages with the hook-shaped portion 52 of the other rail section 30 (for example, the rail section 32 extending from the flat plate section 22).

[0071] The pair of rail sections 30, 30 are configured such that the hook-shaped sections 52, 52 interlock, allowing the other rail section 30 to slide along the other rail section 30. This enables the separation prevention section 3 to allow the flat plate sections 20, 20 to move relative to each other along their extending direction, while simultaneously preventing the distance between the flat plate sections 20, 20 in the width direction of the U-shape of the absorption section 2 from increasing, thereby achieving a separation prevention function by locking one flat plate section 20 to the other flat plate section 20.

[0072] More specifically, the pair of rail sections 30, 30 are designed to slide with their hook-shaped sections 52, 52 interlocked as follows: The tip 54 of one hook-shaped section 52 fits into the groove 53 of the other hook-shaped section 52, creating an interlocked state. With the tip 54 of one rail section 20 fitted into the groove 53 of the other rail section 20, it slides along the groove 53.

[0073] It is preferable that the tip 54 of one rail section 20 is in contact with the bottom of the valley 53 of the other rail section 20. This makes it difficult for the distance between the flat plate sections 20, 20 to increase even when a force is applied to the rail sections 30, 30 in a direction that would increase the distance between the flat plate sections 20, 20.

[0074] As described above, the hook-shaped portion 52 is shaped like the letter J, and the flat plate portion 52a and the flat plate portion 52b are parallel. This increases the durability of the rail portion 30, i.e., the shear force absorbing member 1 (see Figure 1). Furthermore, the increased durability of the shear force absorbing member 1 increases the durability of the seismic-resistant structure 100 (see Figure 1). Specifically, when a force is applied to the rail portion 30, 30 in a direction that increases the distance between the plate surfaces of the flat plate portions 20, 20, the hook-shaped portion 52 is less likely to deform in such a way that the angle on the inside of the valley portion 53 opens up.

[0075] Furthermore, the valley section 53 has a smoothly curved shape. Shapes with sharp corners, such as the letter L or the Japanese character "レ", are excluded from the design of the valley section 53.

[0076] As shown in Figure 1, in the seismic-resistant structure 100, two or more shear force absorbing members 1 may be placed between column sections 81 and 82, which are an example of a pair of structural elements. In this case, the shear force absorbing members 1 may be arranged, for example, at equal intervals along the extending direction of the column section 81. In Figure 1, if one shear force absorbing member 1 and a support frame etc. that is paired with this shear force absorbing member 1 are referred to as mechanism A, then an example is shown where this mechanism A is arranged between the column sections 81 and 82 along the extending direction of the column section 81. Adjacent mechanisms A, A do not need to be in contact or touching, and may be spaced apart. The seismic-resistant structure 100 has multiple shear force absorbing members 1 (mechanism A), which improves the load-bearing capacity of the seismic-resistant structure 100.

[0077] The length of the intermediate plate section 20b along the extension direction of the plate section 20 is determined based on the vertical and horizontal widths of the seismic-resistant structure 100 and the amount of deformation allowed by the seismic-resistant structure 100 (the relative displacement between the column sections 81 and 82 in the direction along these extension directions). In other words, the length of the intermediate plate section 20b is set to the length that allows the above amount of deformation. This makes it possible to absorb shear force in the absorption section 2, as will be described later.

[0078] Next, the operation and function of the shear force absorbing member 1 and the seismic-resistant structure 100 will be explained.

[0079] As shown in Figure 7, when the column sections 81 and 82 move relative to each other along their extension directions, the absorption section 2 of the shear force absorbing member 1 deforms to absorb the shear force and other forces that occur when the column sections 81 and 82 move relative to each other.

[0080] Specifically, as shown in Figure 8, in the absorption section 2, the flat plate sections 20, 20 move relative to each other along the extending direction of these column sections 81, 82 (see Figure 7). When these flat plate sections 20, 20 move relative to each other, bending forces are applied to the curved section 29 and the intermediate flat plate sections 20b, 20b, which are the ends of the flat plate sections 20, 20 connected to the curved section 29. Specifically, a bending force is applied to one of the intermediate flat plate sections 20b so that it curves, and a force is applied to the curved section 29 so that it bends back to a flat shape. The other intermediate flat plate section 20b simply moves. When these curved section 29 and intermediate flat plate sections 20b, 20b (i.e., the absorption section 2) deform due to this bending force, they absorb, buffer, or reduce the speed of relative movement of the column sections 81, 82 as they move relative to each other.

[0081] As described above, when the absorption section 2 absorbs shear forces, etc., when the column sections 81 and 82 move relative to each other, the flat plate sections 20, 20 are prevented from separating from the absorption section 2 in the width direction by the separation prevention section 3. This prevents a decrease in the absorption capacity of the absorption section 2 for shear forces, etc., when the flat plate sections 20, 20 separate from the absorption section 2 in the width direction. Because the absorption section 2 has the separation prevention section 3, the amount of energy such as shear forces that the absorption section 2 can absorb is, for example, more than twice that of the absorption section 2 without the separation prevention section 3.

[0082] If the length of the intermediate flat plate section 20b along the extension direction of the flat plate section 20 is a length that allows for the amount of deformation permitted by the seismic-resistant structure 100, then when the curved section 29 and the intermediate flat plate sections 20b, 20b deform and absorb shear force, the intermediate flat plate sections 20b, 20b function as a deformation allowance within this length range.

[0083] Furthermore, the shear force absorbing member 1 and the seismic-resistant structure 100 described in this embodiment are also valid even if the left and right sides are reversed.

[0084] As described above, the shear force absorbing member 1 and the seismic-resistant structure 100 prevent the flat plate sections 20, 20 from separating in the width direction of the absorption section 2 at the separation prevention section 3, thereby better absorbing the shear force between a pair of structural elements such as the vertical frames 8, 8.

[0085] (Modification 1 of the first embodiment) In the seismic-resistant structure 100 of the first embodiment, the support frame and the like that supporting the shear force absorbing member 1 can be omitted.

[0086] Figure 9 illustrates a modified example in which the shear force absorbing member 1 is supported by vertical frames 8,8 (column sections 81, 82) with a first support section 41 that is directly fixed and supported to one vertical frame 8 (column section 81), and a second support section 42 that is directly fixed and supported to the other vertical frame 8 (column section 82).

[0087] Furthermore, Figure 9 illustrates a case where four shear force absorbing members 1 (mechanism A) are arranged in a specific configuration.

[0088] In this modified example, the first support plate 41a of the first support section 41 may be directly fixed to the column section 81 by spot welding at multiple points or by line welding at multiple points, with unwelded sections existing at regular intervals along the extending direction of the column section 81. The first support plate 41b (see Figure 4) may be the same as the first support plate 41a. In addition, the second support plate 42a of the second support section 42 may be directly fixed to the column section 81 by spot welding or line welding. The second support plate 42b (see Figure 4) may be the same as the second support plate 42a.

[0089] For example, if the upper beam 91 moves horizontally, and the column sections 81 and 82 move relative to each other along their extension direction, the bending moment applied to the intermediate position between adjacent shear force absorbing members 1,1 in the seismic-resistant structure 100, i.e., the boundary portion between mechanisms A, A, becomes zero. Furthermore, the bending moment applied near this boundary portion is smaller than the bending moment applied to the portion further away from this boundary portion. For this reason, the vertical width of the first support plate 41a may be wider on the side closer to the column section 81 and narrower on the side further away from the column section 81. The first support plate 41b (see Figure 4) may be the same as the first support plate 41a. Similarly, the vertical width of the second support plate 42a may be wider on the side closer to the column section 82 and narrower on the side further away from the column section 82. The second support plate 42b (see Figure 4) may be the same as the second support plate 42a. As described above, by making the widths of the first support plates 41a, 41b and the second support plates 42a, 42b narrower as they move away from the column sections 81, 82, the weight of the seismic-resistant structure 100 can be reduced without weakening its load-bearing capacity, and the amount of materials required can be reduced, compared to the case where the first support plates 41a, 41b and the second support plates 42a, 42b are rectangular in shape when viewed from the front.

[0090] (Modification 2 of the first embodiment) In the seismic-resistant structure 100, the shear force absorbing member 1 may be directly fixed to one vertical frame 8 (column portion 81) via a support frame or the like, as shown in Figure 10. Figure 10 illustrates the case where the first support portion 41 consists only of the first connecting plate 41c, showing the case where the first connecting plate 41c, as the first support portion 41, is directly fixed to one vertical frame 8.

[0091] (Modification 3 of the first embodiment) In the seismic-resistant structure 100, the shear force absorbing member 1 may be directly fixed to one vertical frame 8 (column portion 81) by a first connecting plate 41c as a first support portion 41, and to the other vertical frame 8 (column portion 82) by a second support plate 42a or the like as a second support portion 42.

[0092] Furthermore, the shear force absorbing member 1 and the seismic-resistant structure 100 described in the above modifications can be modified in the same way as in the case where the left and right sides of the seismic-resistant structure 100 are reversed. For example, the first support part 41 and the second support part 42 can be swapped left and right, and the distinction between first and second is for the convenience of explanation in this embodiment.

[0093] (Second embodiment) In the first embodiment, the shear force absorbing member 1 in the seismic-resistant structure 100 is oriented such that the extension direction of the flat plate portion 20 of its absorption section 2 is aligned with the extension direction of the vertical frames 8,8 (column portions 81,82), and the flat plate portions 20,20 of the absorption section 2 are fixed to the column portions 81,82. In the second embodiment, as shown in Figure 12, the orientation of the shear force absorbing member 1 differs from that of the first embodiment, with the extension direction of the flat plate portion 20 of its absorption section 2 being aligned with the extension direction of the horizontal frames 9,9 (upper beam 91 and lower beam 92). In the following description, the differences from the first embodiment will be the main focus, and explanations of the same parts will be omitted as appropriate.

[0094] The seismic-resistant structure 100 according to this embodiment comprises a shear force absorbing member 1 and a pair of structural horizontal frames 9,9, which are an upper beam 91 and a lower beam 92. The absorbing portions 2,2 of the shear force absorbing member 1 are such that one flat plate portion 20 is supported by the upper beam 91, which is one horizontal frame 9, and the other flat plate portion 20 is supported by the lower beam 92, which is the other horizontal frame 9.

[0095] The shear force absorbing member 1 and the seismic-resistant structure 100 can better absorb the shear force generated between the upper beam 91 and the lower beam 92 along the direction of extension of the upper beam 91.

[0096] The shear force absorbing member 1 may be supported at its first support section 41 via frame members 71 and 75, one end of which is supported by the upper beam 91. It may also be supported at its second support section 42 via frame members 73 and 77, one end of which is supported by the lower beam 92. The frame members 71, 73, 75, and 77 may be supported at one end at the corners where the upper beam 91 and column section 81 intersect, the corners where the lower beam 92 and column section 81 intersect, the corners where the upper beam 91 and column section 82 intersect, and the corners where the lower beam 92 and column section 82 intersect. The other end of the frame members 71 and 75 may be fixed to the first support section 41, sandwiched between the first support plates 41a and 41b (see Figure 4) of the first support section 41. The frame members 73 and 77 may be fixed to the second support section 42 with their other ends sandwiched between the second support plates 42a and 42b of the second support section 42 (see Figure 4).

[0097] As described above, the shear force absorbing member 1 and the seismic-resistant structure 100 prevent the flat plate sections 20, 20 from separating in the width direction of the absorption section 2 at the separation prevention section 3, thereby better absorbing the shear force between a pair of structural elements such as the horizontal frames 9, 9.

[0098] (Modification 1 of the second embodiment) In the seismic-resistant structure 100 of the second embodiment, the support frame and the like that supporting the shear force absorbing member 1 can be omitted, similar to the case of modification 1 of the first embodiment.

[0099] Figure 13 illustrates a modified example in which the shear force absorbing member 1 is supported by the upper beam 91 and the lower beam 92 by a first support portion 41 directly fixed to the upper beam 91 and a second support portion 42 directly fixed to the lower beam 92.

[0100] (Modification 2 of the second embodiment) In the seismic-resistant structure 100, the shear force absorbing member 1 may be directly fixed to one horizontal frame 9 (upper beam 91) via a support frame or the like, as shown in Figure 14. Figure 14 illustrates the case where the first support part 41 consists only of the first connecting plate 41c, showing that the first connecting plate 41c, as the first support part 41, is directly fixed to one horizontal frame 9 (upper beam 91). Although not shown in the illustration, the same deformation as this modified example can be applied even if the structure of the seismic-resistant structure 100 is inverted vertically.

[0101] (Modification 3 of the second embodiment) In the seismic-resistant structure 100, the shear force absorbing member 1 may be directly fixed to one horizontal frame 9 (upper beam 91) by the first support plate 41a of the first support part 41, and directly fixed to the other horizontal frame 9 (lower beam 92) by the second connecting plate 42c as the second support part 42.

[0102] Furthermore, the shear force absorbing member 1 and the seismic-resistant structure 100 described in the above modifications can be modified in the same way as in the above modifications, even if the upper and lower parts of the structure of the seismic-resistant structure 100 are inverted. For example, the first support part 41 and the second support part 42 can be swapped left and right, and the distinction between first and second is for the convenience of explanation in this embodiment.

[0103] As described above, we can provide a shear force absorbing member and an earthquake-resistant structure that can better absorb shear force.

[0104] [Another embodiment] (1) In the above embodiment, as shown in Figure 4 and the like, the case in which the shear force absorbing member 1 has two absorption parts 2 has been described as an example. However, the shear force absorbing member 1 may have only one absorption part 2. If the separation prevention part 3 can prevent the flat plate parts 20, 20 from separating in the width direction of the absorption part 2, the shear force absorbing member 1 can effectively absorb the shear force etc. generated in the seismic-resistant structure 100.

[0105] (2) In the above embodiment, as shown in Figure 4, the case in which the first support portion 41 has first support plates 41a, 41b and a first connecting plate 41c was described. The case in which the second support portion 42 has second support plates 42a, 42b and a second connecting plate 42c was also described. It was also described that the flat plate portions 20, 20 may be fixed and supported by the first connecting plate 41c and the second connecting plate 42c. However, the first support portion 41 and the second support portion 42 may be in which the first connecting plate 41c and the second connecting plate 42c are omitted. In this case, as shown in Figure 16, the tip flat plate portions 20a, 20a of the flat plate portions 20, 20 may be fixed and supported by the first support plates 41a, 41b and the second support plates 42a, 42b by welding or the like.

[0106] (3) In the above embodiment, as shown in Figure 4, the case in which the first support portion 41 has first support plates 41a, 41b and a first connecting plate 41c was described. The case in which the second support portion 42 has second support plates 42a, 42b and a second connecting plate 42c was also described. It was explained that the flat plate portions 20, 20 may be fixed and supported by the first connecting plate 41c and the second connecting plate 42c. However, the first support portion 41 and the second support portion 42 may be in which the first support plate 41b and the first connecting plate 41c and the first support plate 42b and the second connecting plate 42c are omitted. In this case, as shown in Figure 17, the tip flat plate portions 20a, 20a of the flat plate portions 20, 20 may be fixed and supported by the first support plate 41a and the second support plate 42a by welding or the like. The first support plate 41a and the second support plate 42a may be arranged in the central part of the flat plate portions 20, 20 in the depth direction.

[0107] (4) In the above embodiment, the distance between the vertical frames 8,8 or horizontal frames 9,9, which are a pair of structures, may be determined as appropriate. Note that if the distance between the pair of structures, for example the distance between the vertical frames 8,8 or the distance between the horizontal frames 9,9 is increased, the force in the direction intersecting each structure (for example, the horizontal force on the vertical frames 8,8) that can be allowed by a single shear force absorbing member can be increased due to the aspect ratio.

[0108] (5) In the above embodiment, the flat plate portion 52a was described as having a plate surface parallel to the extending direction of the flat plate portion 20 and erected perpendicular to the surface (inner surface) of the flat plate portion 20, that is, erected parallel to the normal of the surface of the flat plate portion 20. However, the flat plate portion 52a may be inclined with respect to the surface (plate surface) of the flat plate portion 20, as shown in Figure 18.

[0109] Figure 18 illustrates the case where the flat plate portion 52a, i.e., the rail portion 30, is inclined with respect to the direction normal to the surface (plate surface) of the flat plate portion 20. More specifically, the rail portion 30 is inclined with respect to the direction normal to the surface of the flat plate portion 20 by tilting in the depth direction while keeping the plate surface parallel to the extending direction of the flat plate portion 20.

[0110] When the rail section 30 is inclined in this manner, it is preferable that the base ends 51, 51 of the pair of rail sections 30, 30 are located on the same plane along the direction normal to the surface of the flat plate section 20. This makes it possible to reduce the eccentricity distance of the base ends 51, 51 (to zero in the case of Figure 18) when a force is applied to the rail section 30, 30 in a direction that increases the distance between the plate surfaces of the flat plate sections 20, 20, thereby increasing the durability of the rail section 30 (shear force absorbing member 1, see Figure 1).

[0111] (6) In the above embodiment, the separation prevention section 3 was described as having one set of rail sections 30, 30. However, the separation prevention section 3 may have two or more sets of rail sections 30, 30.

[0112] Figures 19 and 20 illustrate the case where the separation prevention section 3 has two sets of rail sections 30, 30, that is, one set of rail sections 30, 30 and another set of rail sections 30, 30. Figure 19 shows the case where one set of rail sections 30, 30 and the other set of rail sections 30, 30 are separated. Figure 20 shows the case where one set of rail sections 30, 30 and the other set of rail sections 30, 30 are in contact (adjacent). In this way, by having two or more sets of rail sections 30, 30, the separation prevention section 3 can reduce the burden on each set when a force is applied to these two sets of rail sections 30, 30 in the direction that increases the distance between the plate surfaces of the flat plate sections 20, 20.

[0113] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments, as long as no inconsistencies arise. Moreover, the embodiments disclosed herein are illustrative, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention. [Industrial applicability]

[0114] This invention can be applied to shear force absorbing members and earthquake-resistant structures. [Explanation of symbols]

[0115] 1: Shear force absorbing member 100: Earthquake-resistant structure 2: Absorbent part 20: Flat plate part 20a:Tip flat plate part 20b: Intermediate flat plate part 21: Flat plate part 22: Flat plate part 29: Curved section 3: Separation prevention part 30: Rail section 31: Rail section 32: Rail section 41:First support part 41a: First support plate 41b: First support plate 41c: First connecting plate 42:Second support part 42a: Second support plate 42b: Second support plate 42c:Second connecting plate 51: Proximal end 52: Unicum 52a: Flat plate part 52b: Flat plate part 53: Tanibe 71:Frame material 72: Frame material 73: Frame material 75: Frame material 76:Frame material 77: Frame material 8: Vertical frame (structure) 81:Column part 81a: Auxiliary frame 82:Column part 82a: Auxiliary frame 9: Horizontal frame (structure) 91: Upper beam 92: Lower beam A:Mechanism

Claims

1. A plate-shaped absorbent section bent into a U-shape, The absorption section comprises a separation prevention section arranged inside the U-shape, The separation prevention section has a pair of rail sections on each of the pair of flat sections that lock together the pair of flat sections so that the distance between the flat section extending from one end of the curved section in the U-shape of the absorption section and the other flat section extending from the other end of the curved section does not increase. The aforementioned rail section is In the flat plate portion, the plate extends from the inner surface of the U-shaped absorption portion, and the plate surface is aligned with the direction of extension of the flat plate portion. One of the flat plate portions is supported by a base end, It has a hook-shaped portion in the shape of the letter J, which is positioned at the end of the other flat plate portion that is close to the other flat plate portion and is folded back toward the side that is close to the first flat plate portion, A shear force absorbing member in which the hook-shaped portion of one rail portion engages with the hook-shaped portion of the other rail portion in a pair of rail portions.

2. The shear force absorbing member according to claim 1, wherein the rail portion is arranged along the extending direction of the flat plate portion, and in a pair of rail portions, the other rail portion is slidable along one of the rail portions.

3. The shear force absorbing member according to claim 2, wherein the valley portion of the J-shaped hook portion is aligned with the extending direction of the flat plate portion.

4. The shear force absorbing member according to claim 2, wherein the separation prevention portion has two or more sets of rail portions.

5. The shear force absorbing member according to claim 3, wherein the separation prevention portion has two or more sets of rail portions.

6. The shear force absorbing member according to any one of claims 1 to 5, wherein the rail portion is inclined with respect to the direction normal to the surface of the flat plate portion.

7. The shear force absorbing member according to claim 6, wherein the base ends of each of the rail sections that make up the pair are located on the same plane along the normal direction of the flat plate section.

8. The rail portion is a shear force absorbing member according to any one of claims 1 to 5, wherein the plate thickness is less than 2.3 mm.

9. The aforementioned absorption section is provided in a pair, The shear force absorbing member according to claim 8, wherein the pair of absorbing portions are arranged on the same virtual plane with their tops facing each other.

10. The shear force absorbing member described in claim 9, Equipped with a pair of structures, The shear force absorbing member has an earthquake-resistant structure in which one of its flat plates is supported by one of the structures and the other of its flat plates is supported by the other structure.

11. It further includes a plate-shaped support part, The aforementioned support portion is The plate surface is arranged so as to intersect with the flat plate portion and along the direction in which the flat plate portion extends. Supported by the aforementioned structure, The seismic-resistant structure according to claim 10, wherein the absorbent portion is supported by the support portion on the outer side of the U-shape of the absorbent portion in the flat plate portion.

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