Buckling restraining brace

Abstract

To provide a buckling restraining brace that allows a concave part into which a deviation stop projection enters to be made larger than an outer size of a welding bead of the deviation stop projection, without requiring a process of forming a releasing concave part and preventing a position deviation between a core material and a restraining material from becoming larger.SOLUTION: A buckling restraining brace 1 is provided with a core material 2 having connection parts 22 at both ends in a longer-edge direction of a plate-like body 21 for connection with another member, and a restraining material 3 arranged opposite to the respective faces orthogonal to a weak-axis direction of the plate-like body 21. On the respective faces of the plate-like body 21, deviation stop projections 25 are formed, and in the restraining material 3 a concave part 33 in which the deviation stop projections enter is formed. As the concave part 33, a tube-like member SP is provided, having an inner surface part of a size not contacting a weld bead 25a. Furthermore, a convex-shaped part 36 facing the deviation stop projection 25 is arranged closer to the deviation stop projection 25 than the inner surface part, at a height above the weld bead 25a of the inner part of the tube-like member SP.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a buckling-restrained brace that is incorporated into the skeleton of a structure to damp vibration energy during earthquakes and the like. [Background technology]

[0002] Patent Document 1 discloses a buckling restraint brace in which anti-slip protrusions that protrude towards the restraint material are welded to a core material at their base ends, protrusion receiving hardware into which the anti-slip protrusions fit and engage is embedded in the concrete-based material of the restraint material, a relief recess is provided in the concrete-based material into which the weld beads at the base ends of the anti-slip protrusions fit, and the protrusion receiving hardware is located in an area that does not come into contact with the weld beads but comes into contact with the anti-slip protrusions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6284722 Summary of the Invention [Problem to be solved by the invention]

[0004] The invention disclosed in the above Patent Document 1 solves the problem of a structure in which the inner diameter of the protrusion receiving hardware is larger than the outer periphery of the weld bead, but it has the disadvantage of requiring the time-consuming processing of forming a relief recess in the concrete-based material of the restraint material.

[0005] An object of the present invention is to provide a buckling restraint brace that allows the recesses into which the anti-slip protrusions fit to be larger than the outer dimensions of the weld beads of the anti-slip protrusions, while avoiding the need for processing to form the conventional relief recesses, thereby preventing large misalignments between the core material and restraint material in the buckling restraint brace. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the buckling restrained brace of this invention comprises a core member having joints at both ends in the long side direction of a plate-like body for joining to other members, and restraint members arranged opposite each face of the plate-like body perpendicular to the weak axis direction, each face of the plate-like body having a slip stop protrusion formed thereon to limit relative movement between the core member and the restraint member, and the restraint member having a recess formed therein into which the slip stop protrusion can be inserted, the recess is formed by a tubular member having an inner surface portion of a size that does not come into contact with a weld bead formed by welding the displacement prevention projection to the plate-like body, A convex portion facing the anti-slip projection is provided at a height position above the weld bead on the inner surface of the tubular member, closer to the anti-slip projection than the inner surface.

[0007] With the above configuration, if a relative positional misalignment occurs between the core material and the restraint material, the anti-slip protrusion will come into contact with the convex portion which is located closer to the anti-slip protrusion than the inner surface portion, thereby allowing the recess into which the anti-slip protrusion fits to be larger than the outer dimensions of the weld bead of the anti-slip protrusion, while avoiding a large positional misalignment between the core material and the restraint material without requiring processing to form a conventional relief recess.

[0008] The convex portion may be a three-dimensional object fixed to the inner surface of the tubular member, whereby the convex portion can be easily produced by fixing the three-dimensional object to the inner surface of the tubular member.

[0009] The three-dimensional object may be made of metal and fixed to the metal tubular member by welding, or may be made of resin or wood and fixed to the tubular member by adhesive or press-fitting.

[0010] Alternatively, the convex portion may be a convex formed portion that protrudes toward the inner surface of the tubular member by pressurizing the tubular member, which allows the convex portion to be produced without increasing the number of parts that make up the three-dimensional object. [Effects of the Invention]

[0011] The present invention allows the recess into which the anti-slip protrusion fits to be larger than the outer dimensions of the weld bead of the anti-slip protrusion, while eliminating the need for processing to form the conventional relief recess, thereby achieving the effect of avoiding large positional misalignment between the core material and the restraint material in the buckling restraint brace. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing the appearance of a buckling restraint brace according to an embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view of the buckling restrained brace of FIG. 1. [Figure 3] FIG. 2 is an exploded explanatory view of the buckling restraint brace of FIG. 1. [Figure 4] 2A and 2B are diagrams showing one of the anti-slip projections and recesses in the buckling restraint brace of FIG. 1, where FIG. 2A is a longitudinal cross-sectional view and FIG. 2B is a plan view of the structure below the unbonded material in FIG. 2A. [Figure 5] This figure shows the anti-slip protrusion and recess on one side of a buckling restraint brace of another embodiment, where (A) is a longitudinal cross-sectional view and (B) is a plan view of the structure below the unbonded material in (A). DETAILED DESCRIPTION OF THE INVENTION

[0013] An embodiment of the present invention will now be described with reference to the accompanying drawings. As shown in Figures 1, 2, and 3, a buckling restrained brace 1 of the embodiment includes a core member 2, a pair of restraint members 3, and an unbonded member 4.

[0014] The core material 2 has a long steel plate-like body 21 and joints 22 located on both ends of the long side of the plate-like body 21 for joining to other members, and is fixed to the building frame by bolts passed through bolt insertion holes formed in the joints 22. The joints 22 have a generally cross-shaped cross section, with plate piece portions 22b welded and fixed in an orthogonal arrangement to extension portions 22a extending from both ends of the plate-like body 21.

[0015] 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 is subjected to a compressive force, a wave-like deformation occurs, with the thickness of the unbond material 4 as a clearance. The arrangement of the unbond material 4 shown in Figure 3 is one example, and the unbond material 4 may also be arranged on the lateral side of the plate piece portion 22b. Furthermore, the unbond material 4 may be attached entirely over the plate-like body 21 of the core material 2 as shown in the figure, or may be attached partially (scattered) although not shown.

[0016] The restraining members 3 are positioned opposite each face (weak axis face) perpendicular to the weak axis direction of the plate-like body 21 of the core material 2. Each restraining member 3 includes a box-shaped member 31 and a hardening member 32.

[0017] Each box-shaped member 31 is made of a steel plate bent into a channel steel shape having a pair of opposing surface portions and a connecting surface portion connecting the opposing surface portions, with an opening located on the side of the core material 2. One side of the opposing surface portions of each box-shaped member 31 is higher than the other side. The higher opposing surface portion of one box-shaped member 31 overlaps the outside of the lower opposing surface portion of the other box-shaped member 31, and this overlap is welded to secure the pair of restraint members 3 to each other. Furthermore, 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 the inner surface of the higher opposing surface portion of each box-shaped member 31 at a position equivalent to the height at which the core material 2 is disposed.

[0018] Wall portions 31a that form the end shapes of the box-shaped member 31 are welded and fixed to both ends of the box-shaped member 31. The height of the wall portions 31a is the same as the height of the opposing surface portion on the lower side of the box-shaped member 31. A recessed portion 31b is formed in the center of the wall portion 31a by being recessed so as to avoid interference with the lowered portion of the plate portion 22b of the joint portion 22.

[0019] The hardening member 32 is filled in the box-shaped member 31 and hardened, and is, for example, mortar or concrete.

[0020] The core material 2 has rectangular prism-shaped anti-slip protrusions 25 protruding from both sides thereof, for example, at its center, while the inner surface of the box-shaped member 31 has recesses 33 into which the anti-slip protrusions 25 fit. The anti-slip protrusions 25 are intended to limit relative movement between the core material 2 and the restraining member 3, which are separated from each other (mainly movement in the longitudinal direction of the plate-like body 21 when attached to the building skeleton). The anti-slip protrusions 25 protrude from the center of each weak axis surface of the plate-like body 21 of the core material 2 and fit into recesses 33 formed on the restraining member 3 side, thereby preventing the restraining member 3 from shifting. Note that the anti-slip protrusions 25 may also be configured to protrude at a position slightly offset in the longitudinal direction of the plate-like body 21 from the center of each weak axis surface of the plate-like body 21, or may be configured so that two or more anti-slip protrusions 25 protrude from each weak axis surface.

[0021] In this embodiment, the shear stop projections 25 are made of steel, such as steel rods, and are welded while inserted into holes in the core member 2. This welding creates weld beads 25a at the base ends of the shear stop projections 25. As shown in FIGS. 4(A) and 4(B), the recesses 33 are formed by tubular members SP made of commercially available square steel pipes with an inner surface large enough not to come into contact with the weld beads 25a. The shear stop projections 25 have rectangular cross sections, and the tubular members SP also have approximately rectangular cross sections, with each long side parallel to the longitudinal direction of the plate-like body 21.

[0022] A convex portion 36 facing the anti-slip projection 25 is provided on the inner surface of the tubular member SP at a height position above the weld bead 25a, and is closer to the anti-slip projection 25 than the inner surface. In this embodiment, the convex portion 36 is a three-dimensional object fixed to the inner surface of the tubular member SP. This three-dimensional object is made of a metal cubic member and is fixed to the tubular member SP by welding.

[0023] With the above configuration, if a relative positional misalignment occurs between the core material 2 and the restraint material 3, the anti-slip protrusion 25 will come into contact with the convex portion 36, which allows the recess 33 into which the anti-slip protrusion 25 fits to be larger than the outer dimensions of the weld bead 25a of the anti-slip protrusion 25, while avoiding a large positional misalignment between the core material 2 and the restraint material 3 without the need for processing to form a conventional relief recess.

[0024] Furthermore, if the convex portion 36 is a three-dimensional object fixed to the inner surface of the tubular member SP, the convex portion 36 can be easily produced by the process of fixing the three-dimensional object to the inner surface of the tubular member SP.

[0025] In the above example, the low convex portion 36 is spot-welded to the inner surface of the tubular member SP at a midpoint, but this welding may also be performed on the tubular member SP before it is welded to the box-shaped member 31. Also, for example, in Figure 4(A), a columnar convex portion 36 having a cross-sectional size that allows it to stand on its own with a height dimension that reaches the bottom end of the tubular member SP may be used, and the self-supporting convex portion 36 may be placed on the tubular member SP that has been welded to the box-shaped member 31, and this convex portion 36 may then be welded and fixed to the inner surface of the tubular member SP. Of course, the method of manufacture is not limited to this.

[0026] In the above example, the three-dimensional object was made of metal, but this is not limited to this. The three-dimensional object may be made of a resin cubic or rod-shaped material or a wooden cubic or rod-shaped material, and may be fixed to a tubular member SP (not limited to being made of metal) by press-fitting or adhesive.

[0027] Furthermore, the convex portion 36 is not limited to being a three-dimensional object fixed to the inner surface of the tubular member SP. As shown in FIGS. 5(A) and 5(B), the convex portion 36 may be a protruding portion that protrudes toward the inner surface of the tubular member SP by applying pressure to the tubular member SP from the outer surface side. This allows the convex portion 36 to be produced without increasing the number of parts that constitute the three-dimensional object. Note that a backing plate that fits inside the tubular member SP may be temporarily placed at the end portion of the tubular member SP that faces the weld bead 25a to prevent the end portion from being depressed and deformed by the pressure processing.

[0028] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0029] 1: Buckling restrained brace 2: Core material 3:Restraint material 4: Unbonded material 21: Plate-shaped body 22: Joint 22a: Extension part 22b: Plate piece 25: Anti-slip protrusion 25a: Weld bead 31: Box-shaped member 31a: Wall part 31b: Recessed section 32: Hardened member 33: Recess 35: Rod-shaped spacer 36: Convex part SP: Tubular member

Claims

1. a core member having joints at both ends in the long side direction of a plate-like body for joining to other members; and restraint members arranged opposite each face of the plate-like body perpendicular to the weak axis direction, wherein each face of the plate-like body is formed with a slip prevention protrusion for restricting relative movement between the core member and the restraint member, and the restraint member is formed with a recess into which the slip prevention protrusion is inserted; the recess is formed by a tubular member having an inner surface portion of a size that does not come into contact with a weld bead formed by welding the displacement prevention projection to the plate-like body, a convex portion facing the anti-slip protrusion is provided on the inner surface of the tubular member at a height position above the weld bead, and the convex portion is closer to the anti-slip protrusion than the inner surface.

2. 2. The buckling restrained brace according to claim 1, wherein the convex portion is a three-dimensional object fixed to the inner surface of the tubular member.

3. 3. The buckling restrained brace according to claim 2, wherein the three-dimensional object is made of metal and is fixed to the metal tubular member by welding.

4. 3. The buckling restrained brace according to claim 2, wherein the three-dimensional object is made of resin or wood and is fixed to the tubular member by adhesive or press-fitting.

5. 2. The buckling restraint brace according to claim 1, wherein the convex portion is a convex formed portion that protrudes toward the inner surface of the tubular member by pressurizing the tubular member.

Images