Buckling restraining brace

Abstract

To suppress a crack occurring in a hardening member in the vicinity place of a storage recess part when a buckling restraining brace mounted on a building receives a load.SOLUTION: A buckling restraining brace 1 includes: a core material 2 where on both ends in the long side direction of a tabular body 21, plate piece parts 22b are fixed to the tabular body 21 in a cross arrangement manner; and a restraining material 3 arranged opposing to each surface orthogonal to a weak axis direction of the tabular body 21. The restraining material 3 includes: a box-like member 31 which has a storage recess part 312 comprising opposing surface parts 31a opposing to each other, an opening formed on the side on which the core material 2 is positioned between the opposing surface parts 31a, and a pair of standing wall parts 312a facing the plate piece part 22b so as to store an inner end side of the plate piece part 22b; a hardening member 32 filled in the box-like member 31 and hardened; and a surrounding plate 5 positioned between a place on the depth end side of the storage recess part 312 and the inner side surface of the opposing surface part 31a, for surrounding the hardening member 32 by the opposing surface part 31a, the standing wall part 312a and an end wall part 311.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a buckling restraint brace having a core material having plate portions on both longitudinal ends of a plate-shaped body, and a pair of restraint members arranged opposite each face of the core material. [Background technology]

[0002] Patent Document 1 discloses a buckling restrained brace comprising a core material having plate pieces fixed to a plate body in a cross arrangement at both ends in the long side direction of the plate body, and restraining members arranged to face each face of the plate body perpendicular to the weak axis direction. The restraining members comprise a box-shaped member having opposing opposing surfaces, an opening formed between the opposing surfaces on the side where the core material is located, and an accommodating recess for accommodating the inner end sides of the plate pieces, and concrete (hardened member) that has been filled into the box-shaped member and hardened. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-249833 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a buckling restraint brace including such concrete (hardened member), it is necessary to improve the strength of the hardened member in the vicinity of the mounting recess when the buckling restraint brace attached to a building is subjected to a load.

[0005] An object of the present invention is to prevent cracks from occurring in the hardened material in the vicinity of the mounting recess when a buckling restraint brace attached to a building is subjected to a load. [Means for solving the problem]

[0006] In order to solve the above problems, the buckling restrained brace of the present invention is a buckling restrained brace including a core material having plate pieces fixed to both ends of a long side direction of a plate-like body in a cross arrangement to the plate-like body, the plate pieces extending in the long side direction, and restraining members arranged to face each face of the plate-like body perpendicular to the weak axis direction, The restraining material is: a box-shaped member having opposing opposing surfaces, a connecting surface portion connecting the opposing surfaces, and a groove-shaped body having an opening on the side where the core material is located between the opposing surfaces, an accommodating recess consisting of a pair of standing wall portions facing the plate portion so as to accommodate the inner end side of the plate portion and a back wall portion connected to the pair of standing wall portions, and end wall portions located on both end sides of the groove-shaped body and lateral to the outer end opening of the accommodating recess; a hardened member filled in the box-shaped member and hardened; and a shroud that is located between a rear end portion of the accommodating recess and an inner surface of the opposing surface portion and that surrounds the hardened member adjacent to the accommodating recess by the opposing surface portion, the standing wall portion, and the end wall portion; The present invention is characterized by comprising:

[0007] With the above configuration, the hardened member adjacent to the accommodating recess is restrained on four sides by the opposing surface portion, the vertical wall portion, the end wall portion, and the surrounding plate, thereby improving local strength and making it less likely for cracks to occur in the hardened member adjacent to the accommodating recess when a buckling restraint brace attached to a building is subjected to a load.

[0008] The shroud may be fixed to the rear wall portion. Alternatively, the shroud may be fixed to the standing wall portion. Alternatively, the shroud may also serve as the rear wall portion.

[0009] A divided shroud may be provided to divide and surround the hardening member to be surrounded. In this case, the hardening member is surrounded by a smaller area, which enhances the restraining effect, and makes it even more difficult for cracks to occur in the hardening member.

[0010] The box-shaped member may include an opposing shroud that faces the shroud at a predetermined distance and is positioned across the opposing surface portions to surround the hardened member closer to the center of the box-shaped member than the shroud. In this way, the hardened member is restrained between the shroud and the opposing shroud, so that damage to the hardened member at the restrained location can be reduced when the hardened member is subjected to wavy deformation of the plate-shaped body (core material) in the buckling restrained brace installed in the building.

[0011] A connecting plate may be provided to connect the shroud and the opposing shroud. This allows the shroud and the opposing shroud to be integrated, making it possible to efficiently install the shroud into the box-shaped member. Also, the connecting plate can directly bear the wave-like deformation of the plate-shaped body as described above, reducing damage to the hardened member.

[0012] A gap through which the uncured hardening member can flow and pass may be formed between the shroud and the connecting surface, which can improve manufacturing efficiency compared to a manufacturing method in which the hardening member is filled into each surrounding portion.

[0013] A gap through which the uncured hardening material can flow and pass may be formed between the divided shroud and the connecting surface portion, which can improve manufacturing efficiency compared to a manufacturing method in which the hardening material is filled into each of the surrounding portions.

[0014] A gap through which the uncured hardening member can flow and pass may be formed between the opposing shroud and the connecting surface, which can improve manufacturing efficiency compared to a manufacturing method in which the hardening member is filled into each of the shrouds. Effect of the Invention

[0015] The present invention has the effect of making it less likely for cracks to occur in the hardened member near the accommodation recess when a buckling restraint brace attached to a building is subjected to a load, thereby improving the local strength of the hardened member. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view showing the appearance of a buckling restraint brace according to an embodiment. [Diagram 2] 1A is a schematic cross-sectional view of the buckling restraint brace of FIG. 1 taken along the line A1-A1, and FIG. 1B is a schematic cross-sectional view of the buckling restraint brace of FIG. 1 taken along the line A2-A2. [Diagram 3] 2A is an exploded explanatory diagram of the buckling restraint brace of FIG. 1, and FIG. 2B is an explanatory diagram showing another example of the restraint material. [Figure 4] 2 is an explanatory diagram showing a part of the inside of a box-shaped member of the buckling restraint brace of FIG. 1. [Diagram 5] FIG. 11 is an explanatory diagram showing a modified example of the buckling restraint brace of the embodiment, illustrating a portion of the inside of the box-shaped member. [Figure 6] FIG. 11 is an explanatory diagram showing a part of the inside of a box-shaped member, illustrating another modified example of the buckling restraint brace of the embodiment. [Figure 7] FIG. 11 is an explanatory diagram showing a part of the inside of a box-shaped member, illustrating another modified example of the buckling restraint brace of the embodiment. [Figure 8] FIG. 11 is an explanatory diagram showing a part of the inside of a box-shaped member, illustrating another modified example of the buckling restraint brace of the embodiment. [Figure 9] FIG. 11 is an explanatory diagram showing a part of the inside of a box-shaped member, illustrating another modified example of the buckling restraint brace of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in Figures 1, 2(A), 2(B) and 3(A), a buckling restrained brace 1 of the embodiment includes a core material 2 and a pair of restraining materials 3. The buckling restrained brace 1 of this embodiment also includes, for example, an unbonded material 4.

[0018] The core material 2 has a steel plate-like body 21 and joints 22 located at both ends of the long side of the plate-like body 21 for joining to other components, and is fixed to the building structure by bolts passed through bolt insertion holes formed in the joints 22.

[0019] The joint 22 has a generally cross-shaped cross section formed by fixing, by welding, a plate piece portion 22b extending in the longitudinal direction of the plate body 21 and disposed perpendicular to the extension portions 22a extending from both ends of the plate body 21.

[0020] The inner end of the plate piece portion 22b is lower in height than the outer end (bolt insertion side) of the plate piece portion 22b. The tip of the inner end of the plate piece portion 22b is, for example, in a substantially right-angled shape. Of course, the shape is not limited to this, and the tip of the inner end of the plate piece portion 22b may be in an oblique shape that is inclined upward toward the outer end with respect to the weak axis direction of the plate-like body 21.

[0021] The restraining members 3 are positioned opposite the weak axis faces perpendicular to the weak axis direction of the plate-like bodies 21 of the core material 2. Each restraining member 3 includes a box-shaped member 31 and a hardening member 32.

[0022] Each box-shaped member 31 has a steel plate (channel-shaped body) bent into a channel shape having a pair of opposing surface portions 31a and a connecting surface portion 31b connecting the opposing surface portions 31a, and an opening is located on the core material 2 side. One side of the opposing surface portions 31a in the box-shaped member 31 is made higher than the other side. The higher opposing surface portion 31a in one box-shaped member 31 overlaps the outside of the lower opposing surface portion 31a in the other box-shaped member 31, and the pair of restraining members 3 are fixed to each other by welding this overlapping portion. Also, as an example, a rod-shaped spacer 35 that is long in the longitudinal direction of the box-shaped member 31 is fixed by welding or the like to a position on the inner surface of the higher opposing surface portion 31a of each box-shaped member 31 corresponding to the height at which the core material 2 is disposed.

[0023] At both ends of the box-shaped member 31, a steel accommodating recess 312 is formed to avoid interference with the inner end side of the plate piece portion 22b of the joint portion 22. The box-shaped member 31 also has steel end walls 311 on both ends of the groove-shaped body, beside the outer end opening of the accommodating recess 312. The height of the end walls 311 is the same as the height of the opposing surface portion 31a on the lower side of the box-shaped member 31.

[0024] The hardening member 32 is, for example, mortar or concrete, which is filled and hardened inside the box-shaped member 31. The upper surface of the hardening member 32 (the surface on the opening side of the box-shaped member 31) is parallel to each surface (weak axis surface) of the plate-shaped body 21 that is perpendicular to the weak axis direction.

[0025] The unbond material 4 is an example of a clearance adjusting material, and is made of, for example, butyl rubber, and is arranged between the core material 2 and the restraining material 3, between one joint 22 of the core material 2 and the other joint 22, so that when the plate-like body 21 receives a compressive force with the thickness of the unbond material 4 as a clearance, a wavy deformation occurs. The arrangement of the unbond material 4 shown in Fig. 3 is an example, and the unbond material 4 may also be arranged on the lateral side of the plate piece portion 22b, and the unbond material 4 may be attached to the entire surface of the plate-like body 21 of the core material 2 as shown in the figure, or may be attached partially (scattered) although not shown.

[0026] The accommodation recess 312 of the restraint member 3 has a pair of vertical walls 312a that face the plate piece portion 22b in parallel. These vertical walls 312a are welded to the connecting surface portion 31b of the box-shaped member 31.

[0027] Further, at the rear side of the accommodating recess 312, a rear wall portion 312b connected to the pair of vertical walls 312a is welded to the connecting surface portion 31b and the vertical wall portion 312a perpendicularly to the connecting surface portion 31b.

[0028] 4, a shroud 5 is provided perpendicular to the connecting surface 31b within the box-shaped member 31. The shroud 5 is located between the inner end of the storage recess 312 and the inner surface of the facing surface 31a, and surrounds the hardened member 32 with the facing surface 31a, the vertical wall 312a, and the end wall 311.

[0029] The shroud 5 is made of, for example, a steel plate having a thickness similar to that of the end wall portions 311, the vertical wall portions 312a, etc., and the shroud 5 itself does not need to significantly improve the rigidity of the box-shaped member 31, but it surrounds the hardened member 32 adjacent to the storage recess 312 to regulate (restrain) the movement of the hardened member 32. From the viewpoint of efficient use of materials for manufacturing the box-shaped member 31, it is desirable for the shroud 5 to be made of a steel plate having the same thickness as the end wall portions 311, the vertical wall portions 312a, etc.

[0030] In this example, the shroud 5 has one rising side surface welded to the inner wall portion 312b, and the other rising side surface welded to the opposing surface portion 31a. The bottom surface side of the shroud 5 may be welded to the connecting surface portion 31b. As shown in FIG. 3B, by shortening the depth direction length of the shroud 5 relative to the box-shaped member 31, a gap through which the unhardened hardened member 32 can flow and pass is formed between the shroud 5 and the connecting surface portion 31b, which can improve the efficiency of production compared to filling the hardened member 32 at each enclosing location.

[0031] In the buckling restrained brace 1 configured as above, the hardened member 32 adjacent to the storage recess 312 is restrained on four sides by the facing surface portion 31a, the vertical wall portion 312a, the end wall portion 311, and the shroud 5, improving the local strength, making it difficult for cracks to occur in the hardened member 32 adjacent to the storage recess 312 when the buckling restrained brace 1 attached to a building is subjected to a load. This also makes it possible to use a relatively inexpensive, low-strength hardened member 32. In addition, by increasing the thickness of the shroud 5, the shroud 5 itself can improve the rigidity of the box-shaped member 31, making it possible to reduce the burden on the hardened member 32 adjacent to the storage recess 312.

[0032] Next, a modified example of the box-shaped member 31 will be described with reference to Fig. 5. The shroud 5 provided on the box-shaped member 31 has one rising side welded to the rising wall portion 312a and the other rising side welded to the opposing surface portion 31a. The bottom side of the shroud 5 may be welded to the connecting surface portion 31b.

[0033] Next, a modified example of the box-shaped member 31 will be described with reference to Fig. 6. The shroud 5 provided on the box-shaped member 31 has one rising side welded to one of the opposing surface portions 31a, the other rising side welded to the other opposing surface portion 31a, and the center side of the shroud 5 welded to the standing wall portion 312a. That is, the shroud 5 also serves as the back wall portion 312b. With this configuration, the number of parts constituting the box-shaped member 31 can be reduced. At least the bottom side of the shroud 5 is welded to the connecting surface portion 31b at the center side that also serves as the back wall portion 312b.

[0034] Next, a modified example of the box-shaped member 31 will be described with reference to FIG. 7. This box-shaped member 31 has a structure in which the divided shroud 5A is arranged perpendicular to the connecting surface portion 31b in the structure shown in FIG. 6. The divided shroud 5A is arranged at a substantially intermediate position between the shroud 5 and the end wall portion 311, and one rising side of the divided shroud 5A is welded to one of the opposing surface portions 31a, and the other rising side is welded to the standing wall portion 312a. The bottom side of the divided shroud 5A may be welded to the connecting surface portion 31b. According to this, the hardened member 32 to be surrounded is surrounded in a smaller range by the divided shroud 5A, and the restraining effect is enhanced, so that the hardened member 32 is more unlikely to crack. In addition, a gap through which the unhardened hardened member 32 can flow and pass may be formed between the divided shroud 5A and the connecting surface portion 31b. From the viewpoint of efficient use of materials for manufacturing the box-shaped member 31, the divided shroud 5A may be made of a steel plate having the same thickness as the shroud 5, the end wall portion 311, the vertical wall portion 312a, and the like.

[0035] Next, a modified example of the box-shaped member 31 will be described with reference to FIG. 8. This box-shaped member 31 has a structure in which an opposing shroud 5B is disposed perpendicular to the joint surface portion 31b in the structure shown in FIG. 6. The opposing shroud 5B faces the shroud 5 at a predetermined distance in the box-shaped member 31 and is located across the opposing surface portion 31a, and can surround the hardened member 32 closer to the center of the box-shaped member 31 than the shroud 5. The opposing shroud 5B has one rising side welded to one opposing surface portion 31a and the other rising side welded to the other opposing surface portion 31a. The bottom side of the opposing shroud 5B may be welded to the joint surface portion 31b, or a gap through which the unhardened hardened member 32 can flow and pass may be formed between the opposing shroud 5B and the joint surface portion 31b. From the viewpoint of efficient use of materials for manufacturing the box-shaped member 31, the opposing shroud 5B may be made of a steel plate having the same thickness as the shroud 5, the end wall portion 311, the vertical wall portion 312a, and the like.

[0036] In a configuration including the opposing shroud 5B, the hardened member 32 is restrained between the shroud 5 and the opposing shroud 5B, so that it is possible to reduce damage to the hardened member 32 when the hardened member 32 at the restrained location is subjected to the wavy deformation of the plate-like body 21 (core material 2) in the buckling restrained brace 1 attached to a building. In other words, the load applied to the hardened member 32 due to the wavy deformation of the plate-like body 21 is not borne by the opposing shroud 5B itself, but by the hardened member 32, thereby reducing damage to the hardened member 32.

[0037] Next, a modified example of the box-shaped member 31 will be described with reference to FIG. 9. The box-shaped member 31 further includes a connection plate 6 that connects the shroud 5 and the opposing shroud 5B to each other by welding or the like to integrate them in the structure shown in FIG. 8. The bottom side of the connection plate 6 may be welded to the connecting surface portion 31b, or a gap through which the unhardened hardened member 32 can flow and pass may be formed between the connection plate 6 and the connecting surface portion 31b. In addition, from the viewpoint of efficient use of the manufacturing materials for the box-shaped member 31, the connection plate 6 may be made of a steel plate having the same thickness as the end wall portion 311, the vertical wall portion 312a, etc. The connection plate 6 may also connect the shroud 5 and the opposing shroud 5B shown in FIG. 4 and FIG. 5.

[0038] In the structure including the above-mentioned connecting plate 6, the shroud 5 and the opposing shroud 5B are integrated, which can improve the efficiency of manufacturing the box-shaped member 31. In addition, the wave-like deformation of the plate-like body 21 is directly received by the connecting plate 6, which can reduce damage to the hardened member 32.

[0039] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0040] 1: Buckling restraint brace 2: Core material 3:Restraint material 4: Unbonded material 5: Enclosure 5A: Split shroud 5B: Opposing shroud 6: Connection plate 21: Plate-shaped body 22: Joint 22a: Extension part 22b: Plate piece 31: Box-shaped member 31a: Opposing surface part 31b: Connecting surface part 32: Hardened member 35: Rod-shaped spacer 311: End wall 312: Storage recess 312a: Standing wall part 312b: Back wall

Claims

1. A buckling restraint brace comprising: a core material having plate pieces fixed to both ends of a long side direction of a plate-like body in a cross arrangement to the plate-like body and extending in the long side direction; and restraint members arranged to face each surface of the plate-like body perpendicular to the weak axis direction, The above-mentioned restraining material is a box-shaped member having opposing opposing surfaces, a connecting surface portion connecting the opposing surfaces, and a groove-shaped body having an opening on the side where the core material is located between the opposing surfaces, an accommodating recess consisting of a pair of standing wall portions facing the plate portion so as to accommodate the inner end side of the plate portion and a back wall portion connected to the pair of standing wall portions, and end wall portions located on both end sides of the groove-shaped body and lateral to the outer end opening of the accommodating recess; a hardened member filled in the box-shaped member and hardened; and a shroud that is located between a rear end portion of the accommodating recess and an inner surface of the opposing surface portion and that surrounds the hardened member adjacent to the accommodating recess by the opposing surface portion, the standing wall portion, and the end wall portion; A buckling restraint brace comprising:

2. 2. The buckling restrained brace of claim 1, wherein the shroud is fixed to the rear wall.

3. 2. The buckling restrained brace according to claim 1, wherein the shroud is fixed to the vertical wall portion.

4. 2. The buckling restrained brace according to claim 1, wherein the enclosure plate also serves as the rear wall portion.

5. 2. The buckling restrained brace of claim 1, further comprising a split shroud for dividing and surrounding the stiffening member to be surrounded.

6. 2. A buckling restraint brace as described in claim 1, further comprising an opposing shroud that faces the shroud at a predetermined distance within the box-shaped member and is positioned across the opposing surface portions, surrounding the stiffening member closer to the center of the box-shaped member than the shroud.

7. 7. The buckling restrained brace according to claim 6, further comprising a connecting plate connecting the shroud and the opposing shroud.

8. A buckling restraint brace as described in any one of claims 1 to 4, characterized in that a gap is formed between the shroud and the connecting surface portion through which the hardened material in an unhardened state can flow and pass.

9. 6. The buckling restraint brace according to claim 5, wherein a gap is formed between the divided shroud and the connecting surface portion through which the hardened material in an unhardened state can flow and pass.

10. 8. The buckling restraint brace according to claim 6 or claim 7, wherein a gap is formed between the opposing shroud and the connecting surface portion through which the hardened material in an unhardened state can flow and pass.

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