JP2018119309A - Buckling restrained brace, load bearing structure, and connection method of buckling restrained brace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buckling restrained brace capable of being easily connected to a gusset plate even when a positioning accuracy of a slit on the gusset plate is not within a predetermined tolerance.SOLUTION: A buckling restrained brace 1 is provided with: a center steel member 2 extending along an axis line P; a restrained member 6 covering an outer peripheral side in a condition that both ends of the center steel member 2 are protruded; a filler filled in an inside of the restrained member 6; a pair of joint plates 5 located to clamp both ends of the center steel member 2; a plate connection part 10 movably connecting the joint plates 5 to the center steel member 2, wherein a total length of the joint plates 5 and the center steel member 2 in an axial line P direction is adjustable by allowing the joint plates 5 to move in respect to the center steel member 2.SELECTED DRAWING: Figure 4

Description

The present invention relates to a buckling-restrained brace that absorbs an excitation force due to an earthquake or the like, a load-bearing structure, and a method for attaching a buckling-restraining brace.

  Conventionally, in a building or a bridge structure, for example, a buckling restrained brace is applied to a shaft member used for bracing. This buckling-restraining brace is a plastic material that prevents the out-of-plane deformation and buckling, by restraining the core material that receives axial force from the outer periphery side by steel pipes, concrete, and mortar. Improve earthquake and vibration control performance.

The buckling restraint portion brace is described in, for example, Patent Document 1, and improves the buckling strength of the core material by a pair of reinforcing members attached so as to sandwich the core material from both sides.
When this buckling restraint brace is attached to a frame fixed to a structure, the buckling restraint brace is suspended by a crane and inserted from a horizontal direction (lateral direction) into a slit formed in a gusset plate of the frame. Then, the buckling restrained brace and the gusset plate are connected (joined) by fillet welding or the like.

International Publication No. 2014/167624

However, it is not always easy to insert the buckling restrained brace into the slit of the gusset plate. When the brace is attached to the frame, it is before adjustment of the construction accuracy, and the position accuracy of the slit of the gusset plate is often insufficient.
For this reason, there is a problem that it takes time to insert the buckling restraint brace into the slit of the gusset plate, and the construction time by the crane becomes long.

  The present invention has been made in view of such problems, and even when the positional accuracy of the slit of the gusset plate is insufficient, the buckling can be easily connected to the gusset plate. An object of the present invention is to provide a restraining brace, a load bearing structure including the buckling restraining brace, and a method for attaching the buckling restraining brace.

In order to solve the above problems, the present invention proposes the following means.
A buckling restrained brace according to a first embodiment of the present invention includes a center steel material extending along an axis, a restraining member that covers an outer peripheral side in a state where both ends of the center steel material are projected, and An inner filling material, a pair of joining plates arranged so as to sandwich both ends of the center steel material, and a plate connecting portion for movably connecting the joining plate to the center steel material. And the length of the joining plate and the central steel material as a whole can be adjusted by moving the joining plate relative to the central steel material.

  Such a buckling restrained brace is made by shortening the length of the joining plate and the central steel material in the axial direction as a whole at the time of attaching the buckling restraining brace, so that the joining plate is connected to both ends of the buckling restraining brace. Can be evacuated.

In the buckling restraint brace according to the second embodiment of the present invention, in the first embodiment, the plate connecting portion includes a through hole formed in the joining plate, a nut portion arranged in the central steel material, A bolt inserted through the through hole and screwed into the nut portion.
Thereby, a joining plate can be easily evacuated from the both ends side of a buckling restraint brace.

The buckling restrained brace according to a third embodiment of the present invention is the first or second embodiment, wherein the central steel material is a flat core material extending along the axis, and both ends of the core material. A bridge plate that is vertically joined to the bridge plate, wherein the joint plate is connected to the bridge plate.
Thereby, the joining plate can be easily retracted from the bridge plate.

The buckling restraint brace according to a fourth aspect of the present invention is the first or second embodiment, wherein the central steel material includes a flat core material extending along the axis, and the joining plate includes It connects with respect to a core material, It is characterized by the above-mentioned.
Thereby, a joining plate can be easily evacuated from a core material.

  A load-bearing structure according to an embodiment of the present invention includes a frame having a rectangular outer shape, and a pair of slits that are arranged to project inward from the frame and extend from an inner end toward the frame. A plurality of gusset plates to be formed, and a buckling-restraining brace according to any one of the first to fourth embodiments, which is spanned between the gusset plates and inserted into and fixed to the slit. It is characterized by that.

  Since such a load-bearing structure has high workability for buckling-restrained braces, it is possible to shorten the time for attaching the buckling-restraining braces.

  According to an embodiment of the present invention, the buckling restraint brace is attached to the gusset plate disposed so as to project inward from the frame in a state where the joining plate is retracted from both ends of the buckling restraint brace. A step of bringing a bending-restraint brace close to each other, a step of temporarily fixing the buckling-restraining brace to the gusset plate, and moving the joining plate toward the both ends, and inserting it into a slit formed in the gusset plate. And a step of welding the joining plate to the gusset plate and the both end portions, respectively.

  Such a method of attaching the buckling restraint brace can be temporarily fixed to the frame gusset plate installed on the structure without interfering with the buckling restraint brace. And since a joining plate is inserted in the slit of a gusset plate after temporarily fixing a buckling restraint brace with respect to a gusset plate, the attachment time of a buckling restraint brace can be shortened.

According to the present invention, according to the buckling restraint brace according to claim 1, the load bearing structure according to claim 5, and the buckling restraint brace attachment method according to claim 6, At this time, the joining plate can be retracted from both ends of the buckling restraint brace. For this reason, it is possible to temporarily fix the buckling restraint brace without interfering with the gusset plate of the frame installed in the structure.
And after temporarily fixing the buckling restraint brace to the gusset plate, for example, by correcting the distortion of the structure and then inserting the joining plate into the slit of the gusset plate, the positional accuracy of the gusset plate slit is insufficient Even in this case, the buckling restraint brace can be easily connected to the gusset plate.

According to the buckling restraint brace described in claim 2, the workability of the buckling restraint brace can be improved without increasing the product cost of the buckling restraint brace.
According to the buckling restraint braces described in claim 3 and claim 4, the present invention can be applied to various types of buckling restraint braces.

It is a figure showing buckling restraint brace 1 concerning a first embodiment of the present invention. It is a front view which shows the load bearing structure 100 incorporating the buckling restraint brace 1. FIG. It is a figure which shows the attachment method of the buckling restraint brace 1, Comprising: A brace lifting process is shown. It is a figure which shows the attachment method of the buckling restraint brace 1, Comprising: A joining plate insertion process is shown. It is a front view which shows the buckling restraint brace 21 which concerns on 2nd embodiment of this invention.

[First embodiment: Buckling restraint brace 1]
Hereinafter, the buckling restrained brace 1 according to the first embodiment of the present invention will be described.
FIG. 1 is a view showing a buckling restrained brace 1 according to a first embodiment of the present invention, where (a) a front view, (b) a plan view, (c) AA sectional view, (d) B. It is -B sectional drawing.
The buckling restrained brace 1 is used, for example, for bracing in a building or a bridge structure, and improves the seismic resistance / damping performance.
The direction along the axis P of the buckling restraint brace 1 is referred to as the axis P direction.

As shown in the figure, the buckling restrained brace 1 includes a center steel material 2 extending along the axis P, a restraining member 6 that covers both ends of the center steel material 2 from the outer peripheral side, and a restraining member 6 And a filler 8 filled inside.
Further, the buckling restrained brace 1 includes four joining plates (joining plates) 5 connected to both ends of the center steel material 2.

The central steel member 2 includes a pair of core members 3 and two bridge plates (connection plates) 4. That is, the buckling restrained brace 1 is a dual core (double core) plate type including two core members 3.
Each of the pair of core members 3 has an elongated flat plate shape and extends along the axis P of the buckling restraint brace 1. The pair of core members 3 are arranged in parallel and spaced apart from each other in the plate thickness direction.

Each of the bridge plates 4 has a flat plate shape, and is fixed to both ends of the pair of core members 3 one by one. Each bridge plate 4 perpendicularly intersects with a pair of core members 3 arranged in parallel. Each bridge plate 4 is fixed to the center of each core member 3 in the plate width direction.
Each bridge plate 4 protrudes along the axis P from the ends of the pair of core members 3.

The restraining member 6 is an elongated rectangular tube-shaped steel pipe and is formed shorter than the central steel material 2. Specifically, the restraining member 6 is slightly shorter than the pair of core members 3 and exposes a part of the joint between the core member 3 and the bridge plate 4. In other words, the bridge plate 4 is arranged over the inside and outside of the restraining member 6.
The restraining member 6 may be, for example, a cylindrical steel pipe.

  End caps 7 for closing the openings are provided at both ends of the restraining member 6. The central steel material 2 is disposed on the axis P of the restraining member 6 in a state of passing through the end lid 7.

  The filler 8 is concrete, mortar, or the like, and suppresses deformation of the central steel material 2 (particularly the core material 3) in a direction other than the axis P direction. Further, the filler 8 holds the central steel material 2 so as to be able to move relative to the restraining member 6 in the axis P direction so that the axial force of the core material 3 is not transmitted to the restraining member 6.

The four joining plates 5 each have a flat plate shape and are arranged so as to sandwich (pinch) both end portions of the center steel material 2. Specifically, two joining plates 5 are respectively arranged on both sides of each end portion of the bridge plate 4 in the plate width direction. The two joining plates 5 are connected vertically to the bridge plate 4. Each joining plate 5 has a length in the direction of the axis P longer than a length of the bridge plate 4 in the thickness direction.
Each joining plate 5 is arranged outside the restraining member 6. And each joining plate 5 is arrange | positioned so that it may protrude from the edge part of the bridge plate 4 to the outer side of the axis line P direction.
Each joining plate 5 is so heavy that an operator cannot hold it by hand.

As shown in FIG. 4, the bridge plate 4 and the joining plate 5 are connected via a plate connecting portion 10. The plate connecting part 10 connects the joining plate 5 to the bridge plate 4 so as to be rotatable (movable).
The plate connecting portion 10 includes a through hole 11 formed in the joining plate 5, a nut portion 12 disposed in the bridge plate 4, and a bolt 13 inserted through the through hole 11 and screwed into the nut portion 12. That is, the bridge plate 4 and the joining plate 5 are not firmly joined and are temporarily fixed via the single bolt 13.

For this reason, the joining plate 5 can be rotationally moved with respect to the bridge plate 4 by loosening the bolts 13. For example, when the joining plate 5 is rotated by 90 ° with respect to the bridge plate 4, the joining plate 5 is disposed at a position Q shown in FIG. 1B and does not protrude outward in the axis P direction from the end of the bridge plate 4. . The length of the joining plate 5 and the central steel material 2 in the direction of the axis P as a whole is the length L1 and is shortened to the length L2.
Thus, the buckling restraint brace 1 of this embodiment has a long length in the direction of the axis P as the whole of the joining plate 5 and the central steel material 2 by the rotational movement of the joining plate 5 with respect to the bridge plate 4. It is possible to switch between an extended state and a shortened state in which the length in the direction of the axis P is short. The buckling restraint brace 1 can adjust the length of the joining plate 5 and the central steel material 2 in the direction of the axis P as a whole.

As shown in FIG. 1, a pair of erection pieces 15 are arranged at the end of the bridge plate 4. Two through holes are formed at the end of the bridge plate 4, and a pair of erection pieces 15 are disposed on both sides of the bridge plate 4 so as to cover the two through holes. That is, the pair of erection pieces 15 are arranged so as to sandwich the end portion of the bridge plate 4.
The erection piece 15 is a rectangular small flat plate and has four through holes. The erection piece 15 is connected to the end portion of the bridge plate 4 by inserting bolts into two through holes formed in the bridge plate 4 and the erection piece 15 and screwing them into nuts.

[Load bearing structure 100]
Next, with reference to FIG. 2, the load bearing structure 100 incorporating the buckling restrained brace 1 of the first embodiment will be described.
The load bearing structure 100 includes a plurality of frames 103 having a rectangular outer shape, a gusset plate (attachment member) 108 disposed at each corner portion 104 of the frame 103, and the frame 103 via the gusset plate 108. And an attached buckling restraint brace 1.

  The frame 103 has two vertical frames 106 that extend in the vertical direction and are spaced apart from each other in the horizontal direction in the horizontal direction, and two horizontal frames 107 that connect the vertical frames 106 to each other vertically. As a result, a corner portion 104 is formed at the connection portion between the vertical frame 106 and the horizontal frame 107.

The gusset plate 108 is a flat plate member and is disposed at the corner portion 104 of the frame 103. Specifically, the gusset plate 108 is provided between the vertical frame 106 and the horizontal frame 107 so as to project diagonally upward or diagonally downward toward the inside of the frame 103.
The gusset plate 108 is joined to the vertical frame 106 and the horizontal frame 107 by, for example, welding.

As shown in FIG. 3, the gusset plate 108 is formed with two slits 109 extending in parallel from the end face facing obliquely upward toward the corner portion 104 of the frame 103.
The two slits 109 are inserted into the pair of joining plates 5 when the buckling restraint brace 1 is attached to the frame 103. For this reason, the two slits 109 are formed to have a width slightly larger than the thickness of the bonding plate 5.
Two through holes are formed in the gusset plate 108. The two through holes are disposed between the two slits 109 in the vicinity of the end face of the gusset plate 108. The erection piece 15 is attached to the end face of the gusset plate 108. The erection piece 15 is connected to the end of the gusset plate 108 by inserting bolts into two through holes formed in the gusset plate 108 and the erection piece 15 and screwing them into nuts.

As shown in FIG. 2, the buckling restrained brace 1 is disposed so as to connect the two gusset plates 108 positioned on the diagonal line of the frame 103. The buckling restrained brace 1 is bridged between the gusset plates 108. That is, the buckling restraint brace 1 is provided such that the axis P is inclined with respect to the vertical direction and the horizontal direction.
The buckling restrained brace 1 is joined by fillet welding in a state where each joining plate 5 is inserted into each slit 109 of the gusset plate 108. That is, the four joining plates 5 are joined to the two gusset plates 108.

[Attaching method of buckling restraint brace 1]
Next, with reference to FIG.3 and FIG.4, the attachment method of the buckling restraint brace 1 of 1st embodiment is demonstrated.
The buckling restraint brace 1 is attached in the order of a brace lifting process, a temporary fixing process, a rebuilding process, a joining plate inserting process, and a welding process.

In the brace lifting step S <b> 1, the buckling restraint brace 1 is lifted by a lifting tool attached to a crane (not shown), and the buckling restraint brace 1 is brought close to the gusset plate 108 of the frame 103.
At this time, the joining plate 5 of the buckling restraint brace 1 is set in a shortened state. That is, the joining plate 5 is retracted from both end sides of the buckling restraint brace 1. Specifically, after loosening the bolts of the plate connecting portion 10 and rotating the joining plate 5, the bolts are tightened and temporarily fixed. As a result, the joining plate 5 does not protrude from the end of the bridge plate 4.
Since the joining plate 5 does not protrude from the end portion of the bridge plate 4, the buckling restraint brace 1 can be easily approached toward the gusset plate 108. Thereby, the edge part of the bridge plate 4 and the edge part of the gusset plate 108 can be made to adjoin easily.

In the temporary fixing step S <b> 2, the buckling restraint brace 1 and the gusset plate 108 are connected by the erection piece 15.
The erection piece 15 is bridged between the bridge plate 4 and the gusset plate 108, and the respective through holes are overlapped. Then, a bolt is inserted into each through hole and screwed with a nut.
Each through hole is formed to have a larger diameter so that the bolt can be easily inserted. For this reason, the buckling restraint brace 1 and the gusset plate 108 can be easily connected by the erection piece 15 even when the buckling restraint brace 1 is suspended by a crane.
In this step, the buckling restrained brace 1 is temporarily fixed to the frame 103. That is, the bolt inserted into the erection piece 15 is temporarily tightened without being finally tightened.
After the buckling restraint brace 1 is temporarily fixed to the frame 103, the hanging tool hung on the buckling restraint brace 1 is removed.

  And the brace lifting process S1 and temporary fixing process S2 which were mentioned above are repeated, and the buckling restraint brace 1 is each attached to the some flame | frame 103 (temporarily fixed).

In the re-installation step S3, the collapse and distortion (distortion) of the plurality of frames 103 are measured, and the collapse and distortion are corrected. By correcting the tilt and distortion of the frame 103, the positional relationship between the frame 103 and the buckling restraint brace 1 also becomes the correct positional relationship.
As described above, since the through holes of the erection piece 15, the bridge plate 4, and the gusset plate 108 are formed to have a large diameter with respect to the bolts, the through holes and the bolts are loose. By this rattling, the position of the buckling restraint brace 1 can be adjusted with respect to the slit 109 of the gusset plate 108.

In the joining plate inserting step S4, the joining plate 5 is inserted into the slit 109 of the gusset plate 108.
Specifically, the bolt 13 of the plate connecting portion 10 is loosened, and the joining plate 5 is rotationally moved with respect to the bridge plate 4 to bring the joining plate 5 into an extended state. That is, the joining plate 5 is rotated toward the gusset plate 108 so as to protrude from the end of the bridge plate 4.
As described above, since the positional relationship between the frame 103 and the buckling restrained brace 1 is correct, the joining plate 5 is smoothly inserted into the slit 109 of the gusset plate 108. Since the joining plate 5 is connected to the bridge plate 4 via the plate connecting portion 10, the process of inserting the joining plate 5 into the slit 109 can be performed by the operator's human power.
In this way, all the joining plates 5 are inserted into the slits 109 of the gusset plate 108.

Finally, in the welding step S <b> 5, the bolts of the plate connecting portion 10 are finally tightened to fix the joining plate 5 to the bridge plate 4. Further, the four bolts of the erection piece 15 are also tightened to connect the bridge plate 4 and the gusset plate 108 via the erection piece 15.
Next, the joining plate 5 and the gusset plate 108 are welded to form a welded portion W (see FIG. 4). The joining plate 5 and the bridge plate 4 are also welded. Each plate is preferably welded by fillet welding. Welding may be performed on only one side or both sides of the bridge plate 4 and the gusset plate 108.
Thereby, the buckling restraint brace 1 is firmly attached to the frame 103.

As described above, in the buckling restraint brace 1, the joining plate 5 can be retracted from both ends of the central steel member 2 in the shortened state during the attaching operation. For this reason, the buckling restrained brace 1 can be temporarily fixed to the gusset plate 108 of the frame 103 installed on the load bearing structure 100 without interfering with it.
Then, after temporarily fixing the buckling-restraining brace 1 to the gusset plate 108, the rebuilding step S3 is performed to correct the distortion of the frame 103, and then the joining plate 5 is extended and the joining plate 5 is gusseted. Insert into the slit 109 of the plate 108. For this reason, even if the initial positional accuracy of the slit 109 of the gusset plate 108 is insufficient, the buckling restraint brace 1 can be easily connected to the gusset plate 108.
The attachment time of the buckling restraint brace 1 can be shortened. Therefore, the crane occupation time (brace lifting step S1) is short, and the construction time can be shortened.

Moreover, the workability of the buckling restrained brace 1 can be improved without increasing the product cost of the buckling restrained brace 1.
The buckling restrained brace 1 is not limited to the dual core (double core) plate type, but may be a single core plate type.

  Moreover, in the attachment method of the load bearing structure 100 and the buckling restraint brace 1, the buckling restraint brace 1 can be easily incorporated into the frame 103, so that the number of construction man-hours can be reduced by improving the workability.

[Second Embodiment: Buckling Restraint Brace 21]
Next, a buckling restrained brace 21 according to a second embodiment of the present invention will be described with reference to FIG. In FIG. 5, a partially enlarged view of the plate connecting portion 10 is also shown.
Constituent elements common to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The buckling restrained brace 21 is a single core plate type including one core member 23, and four joining plates 5 are connected to both ends of the core member 23.
The core member 23 is disposed so as to protrude along the axis P from the two bridge plates 24.

The four joining plates 5 are arranged so as to sandwich both end portions of the core member 23. Specifically, two joining plates 5 are respectively arranged on both sides in the plate width direction of each end of the core member 23. The two joining plates 5 are connected vertically to the core member 23.
And each joining plate 5 is arrange | positioned so that it can protrude along the axis line P from the edge part of the core material 23. FIG.

The core member 23 and the joining plate 5 are connected via the plate connecting portion 10.
The plate connecting portion 10 includes a through hole 11 formed in the joining plate 5, a nut portion 12 disposed in the core member 23, and a bolt 13 that is inserted through the through hole 11 and screwed to the nut portion 12.
For this reason, the joining plate 5 can be rotated with respect to the core member 23 by loosening the bolt 13. For example, when the joining plate 5 is rotated 90 °, the joining plate 5 does not protrude from the end of the core member 23.

The buckling restrained brace 21 has the same effect as the buckling restrained brace 1. That is, in the buckling restraint brace 21, the joining plate 5 can be retracted by shortening the joining plate 5 during the attaching operation. For this reason, the buckling restrained brace 21 can be temporarily fixed to the gusset plate 108 of the frame 103 installed on the load bearing structure 100 without interfering with it.
Then, after temporarily fixing the buckling-restraining brace 21 to the gusset plate 108, the rebuilding step S3 is performed to correct the distortion of the frame 103, and then the joining plate 5 is extended to gusset the joining plate 5. Insert into the slit 109 of the plate 108. For this reason, even if the initial positional accuracy of the slit 109 of the gusset plate 108 is insufficient, the buckling restraint brace 1 can be easily connected to the gusset plate 108.

As described above, the present invention can be applied to various types of buckling restraint braces 1 and 21.
The load bearing structure 100 may incorporate a buckling restrained brace 21 instead of the buckling restrained brace 1. Moreover, the buckling restraint brace 1 and the buckling restraint brace 21 may be mixed.
And the attachment method of the buckling restraint brace 1 of 1st embodiment is applied also to the attachment method of the buckling restraint brace 21 of 2nd embodiment.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to said embodiment. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the scope of the appended claims.

  The plate connecting portion 10 is not limited to the case where the joining plate 5 is connected to the bridge plate 4 and the core member 23 so as to be rotatable. The plate connecting portion 10 may connect the joining plate 5 to the bridge plate 4 or the core member 23 so as to be able to translate (slide) in the axis P direction or the like. In this case, for example, the through-hole formed in the bonding plate 5 is a long hole extending in the axis P direction.

  The plate connecting portion 10 is not limited to using bolts or nuts. It is only necessary that the joining plate 5 can be connected to the bridge plate 4 and the core member 23 so as to rotate and translate, and the configuration thereof is arbitrary.

  The buckling restrained braces 1 and 21 are not limited to the so-called single-flow arrangement (arranged between the corner portions 104). The buckling restraint braces 1 and 21 may be arranged in a so-called K shape.

DESCRIPTION OF SYMBOLS 1,21 ... Buckling restraint brace 2 ... Center steel material 3, 23 ... Core material 4, 24 ... Bridge plate 5 ... Joining plate 6 ... Restraint member 8 ... Filler 10 ... Plate connection part 11 ... Through-hole 12 ... Nut part 13 ... Bolt 100 ... Strength structure 103 ... Frame 108 ... Gusset plate 109 ... Slit

In order to solve the above problems, the present invention proposes the following means.
A buckling restrained brace according to a first embodiment of the present invention includes a center steel material extending along an axis, a restraining member that covers an outer peripheral side in a state where both ends of the center steel material are projected, and An inner filling material, a pair of joining plates arranged so as to sandwich both ends of the center steel material, and a plate connecting portion for movably connecting the joining plate to the center steel material. The center steel material includes a flat core material extending along the axis, and a bridge plate that is joined perpendicularly to both ends of the core material, the joining plate comprising the bridge plate and coupled to, wherein said joining plate is the bridge plate by moving with respect to, is adjustable to the axial length of the entire of the joining plate and the central steel

Such a buckling restrained brace is made by shortening the length of the joining plate and the central steel material in the axial direction as a whole at the time of attaching the buckling restraining brace, so that the joining plate is connected to both ends of the buckling restraining brace. Can be evacuated.
Further, the joining plate can be easily retracted from the bridge plate.

A load-bearing structure according to an embodiment of the present invention includes a frame having a rectangular outer shape, and a pair of slits that are arranged to project inward from the frame and extend from an inner end toward the frame. A plurality of gusset plates to be formed; and the buckling-restraining brace of the first or second embodiment that is spanned between the gusset plates and is inserted into the slit and fixed. And

Since such a load-bearing structure has high workability for buckling-restrained braces, it is possible to shorten the time for attaching the buckling-restraining braces.

A method for attaching a buckling-restrained brace according to an embodiment of the present invention includes a flat plate-shaped core member extending along an axis, a bridge plate that is perpendicularly bonded to both ends of the core member, and the bridge plate. A buckling restraint brace mounting method comprising: a pair of joining plates that are connected to move relative to each other and that are arranged so as to sandwich the bridge plate, from both ends of the buckling restraint brace With the joining plate retracted, the step of bringing the buckling restraint brace close to a gusset plate arranged so as to project inward from the frame, and temporarily fixing the buckling restraint brace to the gusset plate A step of moving the joining plate toward the both end portions and inserting the joining plate into a slit formed in the gusset plate; and the joining And having a step of welding each rate to the gusset plate and said end portion.

Such a method of attaching the buckling restraint brace can be temporarily fixed to the frame gusset plate installed on the structure without interfering with the buckling restraint brace. And since a joining plate is inserted in the slit of a gusset plate after temporarily fixing a buckling restraint brace with respect to a gusset plate, the attachment time of a buckling restraint brace can be shortened.

The buckling restrained brace mounting method according to the fourth embodiment of the present invention is the restraining member that covers the outer peripheral side of the buckling restrained brace in a state where both ends of the core member and the bridge plate are projected, It is characterized by comprising: a filler filled inside the restraining member; and a plate connecting part for movably connecting the joining plate to the bridge plate.

According to the present invention, according to the buckling restraint brace according to claim 1 , the load bearing structure according to claim 3, and the buckling restraint brace attaching method according to claim 4 , At this time, the joining plate can be retracted from both ends of the buckling restraint brace. For this reason, it is possible to temporarily fix the buckling restraint brace without interfering with the gusset plate of the frame installed in the structure.
And after temporarily fixing the buckling restraint brace to the gusset plate, for example, by correcting the distortion of the structure and then inserting the joining plate into the slit of the gusset plate, the positional accuracy of the gusset plate slit is insufficient Even in this case, the buckling restraint brace can be easily connected to the gusset plate.
Further, the present invention can be applied to various types of buckling restrained braces.

According to buckling restrained brace of claim 2, without increasing the production cost of the buckling-restrained braces, Ru can improve workability of the buckling-restrained braces.

Claims (6)

A central steel material extending along an axis;
A restraining member that covers the outer peripheral side in a state where both ends of the central steel material are projected,
A filler filled inside the restraining member;
A pair of joining plates arranged to sandwich both ends of the central steel material;
A plate connecting portion for connecting the joining plate to the central steel material in a movable manner;
With
A buckling-restraining brace characterized in that the axial length of the joining plate and the central steel material as a whole can be adjusted by moving the joining plate relative to the central steel material. The plate connecting portion is
A through-hole formed in the joining plate;
A nut portion arranged in the central steel material;
A bolt inserted through the through hole and screwed into the nut portion;
The buckling restrained brace according to claim 1, comprising: The central steel material is
A flat core material extending along the axis;
A bridge plate joined perpendicularly to both ends of the core;
With
The buckling constraining brace according to claim 1, wherein the joining plate is connected to the bridge plate. The central steel material includes a flat core material extending along the axis,
The buckling restrained brace according to claim 1, wherein the joining plate is connected to the core member. A frame whose outer shape forms a rectangular frame,
A plurality of gusset plates that are arranged so as to project inward from the frame, and are formed with a pair of slits extending from an inner end toward the frame;
The buckling restrained brace according to any one of claims 1 to 4, which is bridged between the gusset plates, and is inserted into the slit and fixed.
A load-bearing structure comprising: A step of bringing the buckling restraint brace close to a gusset plate disposed so as to project inward from the frame in a state where the joining plate is retracted from both ends of the buckling restraint brace;
Temporarily fixing the buckling restraint brace to the gusset plate;
Moving the joining plate to the both end sides and inserting it into a slit formed in the gusset plate;
Welding the joining plate to the gusset plate and both ends,
A method for attaching a buckling-restrained brace characterized by comprising:

Images