JP6886830B2 - Buckling restraint brace, reinforcement structure of column-beam connection, and building - Google Patents

Description

The present invention relates to a building having a buckling restraint brace, a reinforcing structure of a beam-column connection portion using the buckling restraint brace, and a reinforcing structure of the column-beam connection portion.

Conventionally, for the purpose of reinforcing a building, for example, a rod-shaped reinforcing member (brace) having one end connected to a column and the other end connected to a beam may be arranged. When the building is about to be deformed, either a compressive force or a tensile force is applied to the reinforcing member along its longitudinal direction.

If the reinforcing member receives a strong compressive force along its longitudinal direction and buckles, the building cannot be sufficiently reinforced. Therefore, apart from the brace core material, which is a member that directly receives a compressive force or a tensile force, a reinforcing member having a structure provided with a buckling restraining material, which is a member for suppressing buckling of the brace core material, has been proposed. The buckling restraining material is arranged around the brace core material so that when the brace core material that has received a compressive force tries to deform in a direction perpendicular to the longitudinal direction, a force is applied in a direction that suppresses the deformation. It is a member. A reinforcing member provided with such a buckling restraining material is called a "buckling restraining brace". The above-mentioned force applied from the buckling restraining material to the brace core material is also referred to as "buckling restraining force" below.

Patent Document 1 below describes a buckling restraint brace having a structure in which a brace core material is sandwiched between two buckling restraint members formed in a plate shape and the buckling restraint members are bolted to each other. .. A buckling restraint brace having such a configuration can be formed by a simple operation of fastening bolts. However, the two buckling restraints fixed to each other are not completely integrated. Therefore, depending on the magnitude of the compressive force applied to the brace core material, the two buckling restraining materials may be slightly displaced along the surfaces in contact with each other. Therefore, when the brace core material is to be deformed by receiving a compressive force, it is not possible to apply a buckling restraining force of a magnitude required to suppress the deformation to the brace core material, and buckling suppression is suppressed. It may not be possible to do enough.

Further, Patent Document 2 describes a buckling restraint brace having a structure in which two buckling restraint members are welded and fixed to each other. Specifically, a buckling restraint brace having a configuration in which a part of the surface of each of the two buckling restraint members is brought into contact with each other and the contact surface is partially welded and fixed is described. In such a configuration, the displacement between the buckling restraining materials is suppressed as compared with the case of fixing with bolts.

JP-A-2002-4436 Japanese Unexamined Patent Publication No. 2015-4173

However, even in the case of the method described in Patent Document 2, when the brace core material is subjected to excessive stress and attempts to buckle and deform, the two buckling restraining materials are partially peeled off from each other. There is a possibility that it will end up. Therefore, there is room for improvement in terms of the effect of suppressing buckling when the brace core material receives a compressive force.

Therefore, the present invention is a buckling restraint brace that can suppress the two buckling restraining materials fixed to each other from being peeled off and suppress buckling when a strong compressive force is applied to the brace core material. It is an object of the present invention to provide a reinforcing structure of a column-beam connection portion and a building.

The present invention has been made to solve the above problems, and the buckling restraint brace of the present invention includes a brace core material in which both ends are connected to a vertical frame material or a horizontal frame material, respectively.
A buckling restraint brace comprising a buckling restraining material that surrounds the brace core material and suppresses buckling of the brace core material.
The buckling restraining material has a first restraining material and a second restraining material.
The buckling restraining material includes a fixing portion for fixing the first restraining material and the second restraining material in a state where the brace core material is arranged between the first restraining material and the second restraining material. It is provided,
The fixing portion is characterized by having a fastening fixing portion fixed by using a fastening member and a welding fixing portion fixed by welding.

In the buckling restraint brace of the present invention, it is preferable that the fastening fixing portion is provided at an end portion of the buckling restraint material in the longitudinal direction.

Further, in the buckling restraint brace of the present invention, it is preferable that the fastening fixing portions are provided on both sides of the brace core material in the lateral direction orthogonal to the longitudinal direction of the buckling restraint material. ..

Further, in the buckling restraint brace of the present invention, of the pair of fastening and fixing portions provided on both sides of the brace core material, the side far from the fixing portion between the vertical frame material and the horizontal frame material. It is preferable that the fastening and fixing portion is arranged in a region between two straight lines forming 60 ° on both sides with a straight line extending in the lateral direction from the fastening and fixing portion on the side close to the fixing portion.

Further, the reinforcing structure of the column-beam connection portion of the present invention is characterized in that both ends of any of the above buckling restraint braces are connected to the column or beam.

Further, the building of the present invention is characterized by including the reinforcing structure of the above-mentioned column-beam connection portion.

According to the present invention, there is provided a buckling restraint brace capable of suppressing the peeling of two buckling restraints fixed to each other and suppressing buckling when a strong compressive force is applied to the brace core material. can do.

It is a figure which shows the state which the buckling restraint brace which concerns on one Embodiment of this invention is attached to the connection part of a column and a beam. It is an exploded view of the buckling restraint brace shown in FIG. FIG. 1A is a cross-sectional view taken along the line AA of the buckling restraint brace shown in FIG. 1, and FIG. 1B is a cross-sectional view taken along the line BB. It is a figure which shows the state which the buckling restraint brace which concerns on other embodiment of this invention is attached to the connection part of a column and a beam. It is a figure which shows the state which the buckling restraint brace which concerns on still another Embodiment of this invention is attached to the connection part of a column and a beam.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same reference numerals are given to the common configurations in each figure.

In FIG. 1, a buckling restraint brace 1 according to an embodiment of the present invention is attached to a connecting portion (column-beam connecting portion) between a column 2 and a beam 3 in a building in a cane shape to reinforce the column-beam connecting portion. It is a figure which shows the state which forms the structure. In FIG. 1, columns 2 as vertical frame members arranged along the vertical direction and beams 3 as horizontal frame members arranged along the horizontal direction are fastened by a plurality of bolts 4 as fastening members. It is fixed. The building is, for example, an industrialized house having a steel frame, and has a reinforced concrete foundation fixed to the ground and a frame composed of structural members such as columns 2 and beams 3 as the foundation. It is composed of a fixed steel-framed superstructure. The structural members such as columns 2 and beams 3 that constitute the frame of the superstructure are standardized (standardized) in advance, and are manufactured at a factory and assembled at a construction site.

The pillar 2 is a steel prism having a space formed inside, and a plurality of through holes 2a for inserting the bolt 4 are formed on the side surface thereof.

The beam 3 is an H-section steel having a pair of flanges parallel to each other, an upper flange 3a and a lower flange 3b, and a web 3c connecting them. A fixed flange 3d perpendicular to any of the upper flange 3a, the lower flange 3b, and the web 3c is welded and fixed to the end portion of the beam 3 in the longitudinal direction. Further, in the fixed flange 3d, a plurality of through holes 3e are formed at positions corresponding to the plurality of through holes 2a formed in the pillar 2. The beam 3 is fixed to the column 2 by inserting the bolt 4 as a fastening member into the through hole 2a and the through hole 3e and fastening the beam 3 in a state where the fixing flange 3d is in contact with the side surface of the column 2. ing.

As shown in FIG. 1, the buckling restraint brace 1 is a member for reinforcing the connecting portion by being attached as a cane at the connecting portion between the column 2 and the beam 3. The buckling restraint brace 1 is fastened and fixed to the beam 3 by bolts 5 and nuts 6 as fastening members in a state where the upper end portion thereof is in contact with the lower flange 3b of the beam 3 from the lower side. Further, the buckling restraint brace 1 is fastened and fixed to the pillar 2 by a bolt 7 as a fastening member in a state where the lower end portion thereof is in contact with the side surface of the pillar 2.

FIG. 2 is an exploded view of the buckling restraint brace 1. As shown in FIG. 2, the buckling restraint brace 1 has a brace core material 10 and a first restraint material 11 and a second restraint material 12 arranged so as to sandwich the brace core material 10 in between. As shown in FIG. 1, the first restraining material 11 and the second restraining material 12 are fixed by the weld fixing portion 13 and the fastening fixing portion 14, surround the brace core material 10, and suppress the buckling of the brace core material 10. It constitutes a buckling restraint material. 3 (a) and 3 (b) are cross-sectional views showing a state in which the buckling restraint brace 1 is cut in a plane perpendicular to the longitudinal direction (z direction) thereof, and FIG. 3 (a) is a cross-sectional view. It is a cross-sectional view at the position shown by the line AA, and (b) is a cross-sectional view at the position shown by the line BB in FIG.

The brace core material 10 is made of a steel material having a yield point lower than that of the column 2 and the beam 3, and is a thin plate-shaped shaft portion 10a and a first flange portion welded and fixed to both ends of the shaft portion 10a in the longitudinal direction. It has 10b and a second flange portion 10c. As shown in FIG. 1, the first flange portion 10b is in contact with the lower flange 3b of the beam 3 from below. A plurality of through holes 10d are formed in the first flange portion 10b. By inserting the bolt 5 into these through holes 10d and fastening the bolt 5 with the nut 6, the upper end portion of the brace core material 10 is fixed to the beam 3.

The second flange portion 10c is in contact with the side surface of the pillar 2. A plurality of through holes 10e are formed in the second flange portion 10c. By inserting bolts 7 through these through holes 10e and fastening them to through holes 2b, which are different from the through holes 2a in which the beams 3 are fastened and fixed, the lower end of the brace core material 10 is attached to the pillar 2. Is fixed.

In this way, one end of the brace core 10 is fixed to the beam 3 and the other end is fixed to the column 2. Therefore, for example, when the building is to be subjected to interlayer deformation so that the angle formed by the column 2 and the beam 3 is changed, the shaft portion 10a of the brace core material 10 has a compressive force or a tensile force along the longitudinal direction thereof. Is added. In other words, the shaft portion 10a of the brace core material 10 generates a force that opposes the above-mentioned compressive force or tensile force so as to prevent the connection portion between the column 2 and the beam 3 from being deformed. It is a member for.

The shaft portion 10a of the brace core material 10 has a first enlarged portion 10f and a second enlarged portion 10 g, which gradually increase in width (length in the x direction described later) toward the tip, respectively, at both ends in the longitudinal direction. By providing such a first enlarged portion 10f and a second enlarged portion 10 g, it is possible to increase the strength of the portion of the shaft portion 10a exposed from the buckling restraining material and make it difficult for the exposed portion to buckle. As a result, the effect of the buckling restraint brace 1 that suppresses the deformation of the column-beam connection portion can be enhanced.

By the way, since the shaft portion 10a is a long plate-shaped member, if the above-mentioned compressive force is applied along the longitudinal direction thereof, the shaft portion 10a may buckle depending on the magnitude of the compressive force. is there. Specifically, there is a possibility that the entire shaft portion 10a is deformed in an arc shape so that the shaft portion 10a is deformed in a direction perpendicular to the surface of the shaft portion 10a (overall buckling). Alternatively, the shaft portion 10a may be locally deformed so that only a part of the shaft portion 10a is displaced in a direction perpendicular to the surface of the shaft portion 10a (local buckling). When such buckling occurs, the connection portion between the column 2 and the beam 3 cannot be sufficiently reinforced. The first restraint member 11 and the second restraint member 12 arranged so as to sandwich the brace core member 10 in between are members for suppressing buckling of the shaft portion 10a as described above.

In the following description, as shown in FIG. 1, the longitudinal direction of the shaft portion 10a is the z direction. Further, the cross-sectional shape when the shaft portion 10a is cut on a plane perpendicular to the z direction is a rectangle, and the direction along the long side of the rectangle is the x direction. Further, the direction perpendicular to both the x direction and the z direction is defined as the y direction.

The first restraint member 11 is formed of a steel material, and has a flat plate portion 11a substantially parallel to the shaft portion 10a, a first protruding portion 11b which is a pair of protruding portions protruding upward in FIG. 2 from the flat plate portion 11a, and a first protruding portion 11b. It has a second protruding portion 11c.

Both the first protruding portion 11b and the second protruding portion 11c are formed by welding and fixing a rod-shaped body having a rectangular cross section to the flat plate portion 11a. The first protruding portion 11b and the second protruding portion 11c both have their longitudinal directions coincident with each other in the z direction, and both are parallel to each other. In the present embodiment, the longitudinal length of the first protrusion 11b is shorter than the longitudinal length of the second protrusion 11c. Further, the flat plate portion 11a of the first restraining member 11 has a substantially trapezoidal shape in which the length of the outer edge portion on the first protruding portion 11b side is shorter than the length of the outer edge portion on the second protruding portion 11c side.

The first protruding portion 11b is formed with a through hole 11d penetrating the first protruding portion 11b and the flat plate portion 11a at a position corresponding to the fastening fixing portion 14 described later. Similarly, the second protruding portion 11c is formed with a through hole 11e penetrating the second protruding portion 11c and the flat plate portion 11a at a position corresponding to the fastening fixing portion 14.

The distance between the first protrusion 11b and the second protrusion 11c (distance along the x direction) is slightly wider than the width of the shaft portion 10a along the x direction. Further, the heights (lengths along the y direction) of the first protruding portion 11b and the second protruding portion 11c are the same as each other, and both are slightly larger than the thickness of the shaft portion 10a. Further, the length of the first restraint member 11 and the second restraint member 12 in the longitudinal direction (z direction) is shorter than the length of the shaft portion 10a.

The first restraining member 11 has the first protruding portion 11b and the second protruding portion 11b with the surfaces of the flat plate portion 11a on which the first protruding portion 11b and the second protruding portion 11c are formed facing toward the shaft portion 10a. The shaft portion 10a is housed between 11c.

The second restraining material 12 is a flat plate formed of the same steel material as the first restraining material 11. The second restraint member 12 has the same shape as the flat plate portion 11a of the first restraint member 11 and is parallel to the flat plate portion 11a. The second restraint member 12 is arranged so as to overlap the flat plate portion 11a as a whole when viewed along the y direction.

The second restraint member 12 is in contact with the upper surface of the first protrusion 11b and the upper surface of the second protrusion 11c with a part of the lower surface in FIG. 2 in contact with the first restraint member 11. Is fixed. With such a configuration, the shaft portion 10a of the brace core material 10 is sandwiched between the first restraining material 11 and the second restraining material 12 from both sides in the y direction. Further, the first restraint member 11 and the second restraint member 12 are firmly fixed by a plurality of fixing portions, specifically, a plurality of welding fixing portions 13 and a plurality of fastening fixing portions 14. The first restraining material 11 and the second restraining material 12 may not be in contact with each other. That is, it may be fastened and fixed by fastening members such as bolts and nuts with a gap between the first restraining member 11 and the second restraining member 12. Further, the weld metal may be arranged in the gap between the first restraint material 11 and the second restraint material 12 to weld and fix the first restraint material 11 and the second restraint material 12.

As shown in FIGS. 2 and 3 (a) and 3 (b), a plurality of through holes 12b are provided in the contact surface 12a, which is a region in contact with the upper surface of the first protrusion 11b in the second restraint member 12. It is formed. Further, in the second restraint member 12, a plurality of through holes 12d are formed in the contact surface 12c, which is a region in contact with the upper surface of the second protrusion 11c. Bolts can be inserted into the through holes 12b and the through holes 12d, and they can also be used for plug welding, which will be described later.

In the present embodiment, the weld fixing portion 13 is formed in all the through holes 12b and 12d except for the position of the fastening fixing portion 14. Of the through holes 12b and 12d, the positions where the fastening fixing portion 14 and the welding fixing portion 13 are formed can be changed as appropriate, and some of the through holes 12b and 12d may not be used. Further, from the viewpoint of achieving a good balance between the effect of preventing the fastening fixing portion 14 from peeling off and the effect of stiffening the welding fixing portion 13, it is preferable that the number of the welding fixing portions 13 is larger than that of the fastening fixing portion 14. ..

In the welded fixing portion 13, the inside of the through hole 12b is filled with the weld metal 15 in a state where the contact surface 12a of the second restraining material 12 is in contact with the upper surface of the first protruding portion 11b. 2 The restraining material 12 and the first protruding portion 11b are welded and fixed. That is, the second restraint member 12 and the first protruding portion 11b are fixed by plug welding. In FIG. 3A, the entire inside of the through hole 12b is filled with the weld metal 15, but it is not always necessary to have such a mode. For example, the weld metal 15 may not be present in the central portion of the through hole 12b. In the present embodiment, the weld fixing portion 13 is formed by plug welding, but the present invention is not limited to this, and may be formed by groove welding, fillet hole welding, or fillet groove welding. Further, different types of welding may be performed on the plurality of welding fixing portions 13 depending on the location.

Further, in a state where the contact surface 12c of the second restraint member 12 is in contact with the upper surface of the second protrusion 11c, the inside of the through hole 12d is filled with the weld metal 15 to form the second restraint member 12. The second protruding portion 11c is welded and fixed.

In the present embodiment, the second restraint as described above also applies to the welding and fixing of the flat plate portion 11a and the first protruding portion 11b and the welding fixing of the flat plate portion 11a and the second protruding portion 11c. The structure is the same as that of welding and fixing the material 12 and the first protruding portion 11b and the like.

As shown in FIG. 3B, in the fastening fixing portion 14, the through hole 11d communicating with the fastening fixing portion 14 in a state where the contact surface 12a of the second restraining member 12 is in contact with the upper surface of the first protruding portion 11b. The second restraint member 12 and the first restraint member 11 are fastened and fixed by inserting the bolt 16 into the through hole 12b and fastening the bolt 16 with the nut 17. Further, in a state where the contact surface 12c of the second restraint member 12 is in contact with the upper surface of the second protrusion 11c, the bolt 16 is inserted into the through hole 11e and the through hole 12d that communicate with each other, and the nut 17 is used. By fastening, the second restraint member 12 and the first restraint member 11 are fastened and fixed. The fastening fixing portion 14 can easily increase the fixing strength by using the fastening members such as the bolt 16 and the nut 17 as members made of a high-strength material. On the other hand, in order to increase the strength of the welded fixing portion, it is necessary to use not only the strength of the weld metal but also a high-strength material for the first restraining material 11 and the second restraining material 12 as a whole. Must be. Therefore, by providing the fastening fixing portion 14, the buckling prevention effect of the buckling restraint brace 1 can be easily enhanced without increasing the strength of the first restraint member 11 and the second restraint member 12 as a whole.

In the buckling restraint brace 1 of the present embodiment, the displacement between the first restraint member 11 and the second restraint member 12 can be suppressed by providing the weld fixing portion 13. Further, by providing the fastening fixing portion 14, it is possible to prevent the first restraining material 11 and the second restraining material 12 from being peeled off when the brace core material 10 of the buckling restraining brace 1 receives an excessive compressive force. can do. With such a configuration, when a strong compressive force is applied to the brace core material 10 and the brace core material 10 tries to deform in the buckling direction, a strong buckling restraining force is applied to the first restraining material 11 or the second restraining material 12. Is added to the brace core material 10. As a result, buckling of the brace core material 10 is suppressed.

Further, in the buckling restraint brace 1 of the present embodiment, as shown in FIG. 3A, the plurality of through holes 12b formed in the second restraint member 12 are all in the x direction of the contact surface 12a. It is formed in the central position. Further, the plurality of through holes 12d formed in the second restraint member 12 are all formed at positions centered on the abutting surface 12c in the x direction. In other words, the weld fixing portion 13 is located on the contact surface 12a, 12c where the first restraint member 11 and the second restraint member 12 abut, which is closer to the center than the outer edge of the contact surface 12a, 12c. It is provided. That is, the welded portion between the first restraining material 11 and the second restraining material 12 does not overlap with the outer edges of the contact surfaces 12a and 12c of both, and the welded portion is surrounded by the contact surfaces 12a and 12c. It is in a state.

Therefore, as compared with the case where only a part of the outer edges of the contact surfaces 12a and 12c is welded, for example, a region of the contact surfaces 12a and 12c that is only in contact with each other and is not integrated. Areas other than welds) are relatively narrow. As a result, the degree of freedom of deformation such that the first restraining material 11 and the second restraining material 12 are relatively displaced is reduced, and the first restraining material 11 and the second restraining material 12 come into contact with each other. The first restraining material 11 and the second restraining material 12 are displaced along the surfaces 12a and 12c (for example, along the x direction) and in the direction perpendicular to the contact surfaces 12a and 12c (y direction). It is highly effective in suppressing that at least one of them is deformed and separated from each other.

The fastening fixing portion 14 is preferably formed at an end portion of the buckling restraining material in the longitudinal direction. Here, the "end portion in the longitudinal direction" of the buckling restraining material is, for example, a one-third region on both sides excluding the central region when the buckling restraining material is divided into three equal parts in the longitudinal direction. To do. Compared to the central portion, the end portion of the buckling restraining material in the longitudinal direction is particularly likely to be subjected to a force that tends to peel off the first restraining material 11 and the second restraining material 12 due to the buckling deformation of the brace core material 10. , The curvature when buckled and deformed becomes large. By arranging a fastening fixing portion 14 that is strong against a force in the separation direction that peels off the first restraining material 11 and the second restraining material 12 at such an end portion, the peeling is suppressed, and as a result, buckling restraint is performed. You can increase your strength. The length of the buckling restraining material in the longitudinal direction is the length connecting the center points of one end and the other end.

Further, the fastening fixing portions 14 are preferably arranged on both sides of the brace core material 10 in the lateral direction (x direction in the present embodiment) orthogonal to the longitudinal direction (z direction), according to this. , The first restraining material 11 and the second restraining material 12 are more difficult to be peeled off. In the present embodiment, a pair of fastening fixing portions 14 located on both sides of the brace core material 10 are provided at both side ends of the buckling restraining material in the longitudinal direction. The fastening fixing portions 14 are preferably provided on both sides of the brace core material 10 in the lateral direction, but are not necessarily provided on both sides, and are provided only at locations where the buckling restraining material is displaced and fracture starts. Alternatively, for example, only the side close to the fixing portion where the column 2 and the beam 3 are fixed (the short side side of the second restraining member 12 having a substantially trapezoidal shape) may be used. Further, a plurality of fastening and fixing portions 14 may be provided on the side close to the fixing portion in the lateral direction, or the fastening and fixing portions 14 may be provided only on one end. Further, as shown in FIG. 1, the buckling restraining material has a trapezoidal shape in the present embodiment. In the case of a trapezoid with a short upper side and a long lower side as in the present embodiment, if the fastening fixing portion 14 is provided in the vicinity of the perpendiculars drawn from both side ends of the upper side to the lower side, the trapezoidal buckling restraining material is deformed. It can be effectively suppressed.

In the present embodiment, the fastening fixing portion 14 is long on the contact surface 12a on the side close to the fixing point where the column 2 and the beam 3 are fixed (the short side side of the second restraining member 12 having a substantially trapezoidal shape). It is provided in through holes 12b at both ends in the direction.

Here, in the present embodiment, as shown in FIG. 1, the buckling restraint brace 1 is attached so that the angle θ1 with respect to the pillar 2 is smaller than 45 °, specifically about 20 °. In such a case, the column 2 side (lower side) is fastened and fixed on the contact surface 12c on the side far from the fixing point between the column 2 and the beam 3 (the long side side of the second restraining member 12 having a substantially trapezoidal shape). The portion 14 is provided in the through hole 12d located on the center side of the through hole 12d at the end in the longitudinal direction, and the fastening fixing portion 14 on the beam 3 side (upper side) is the through hole at the end in the longitudinal direction. It is preferably provided at 12d.

As shown in FIG. 1, of the pair of fastening and fixing portions 14 provided on both sides of the brace core material 10, the fastening and fixing portions 14 located on the contact surface 12c on the side far from the fixing portion between the column 2 and the beam 3. Is arranged in the region between the straight line D and the straight line E forming 60 ° on both sides of the straight line C extending in the x direction from the fastening fixing portion 14 located on the contact surface 12a on the side close to the fixing point. Is preferable. In the region between the straight line D and the straight line E on the contact surface 12c, when the brace core material 10 receives an excessive compressive force, a force that tries to peel off the first restraining material 11 and the second restraining material 12. Is especially easy to join. Therefore, by arranging the fastening fixing portion 14 in the region, the effect of suppressing the first restraining member 11 and the second restraining member 12 from being peeled off can be enhanced.

Hereinafter, other embodiments of the present invention will be described. The parts having the same basic functions as those of the above-described embodiment are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

FIG. 4 shows a buckling restraint brace 20 attached so that the angle θ2 with respect to the pillar 2 is about 45 °. In such a case, the fastening fixing portion 14 on the column 2 side (lower side) on the contact surface 12c on the side far from the fixing portion between the column 2 and the beam 3 is centered on the through hole 12d at the end in the longitudinal direction. It is provided in the through hole 12d located on the side, and the fastening fixing portion 14 on the beam 3 side (upper side) is provided in the through hole 12d located on the center side of the through hole 12d at the end in the longitudinal direction. Is preferable.

Also in this embodiment, the fastening fixing portion 14 located on the contact surface 12c on the side far from the fixing portion between the column 2 and the beam 3 is the fastening fixing portion located on the contact surface 12a on the side close to the fixing portion. It is preferably arranged in the region between the straight line D and the straight line E forming 60 ° on both sides of the straight line C extending from 14 in the x direction.

FIG. 5 shows a buckling restraint brace 30 attached so that the angle θ3 with respect to the pillar 2 is about 70 °. In such a case, the fastening fixing portion 14 on the column 2 side (lower side) on the contact surface 12c on the side far from the fixing portion between the column 2 and the beam 3 is provided in the through hole 12d at the end in the longitudinal direction. The fastening and fixing portion 14 on the beam 3 side (upper side) is preferably provided in the through hole 12d located on the center side of the through hole 12d at the end in the longitudinal direction.

Also in this embodiment, the fastening fixing portion 14 located on the contact surface 12c on the side far from the fixing portion between the column 2 and the beam 3 is the fastening fixing portion located on the contact surface 12a on the side close to the fixing portion. It is preferably arranged in the region between the straight line D and the straight line E forming 60 ° on both sides of the straight line C extending from 14 in the x direction.

The buckling restraint brace, the reinforcing structure, and the building according to the present invention are not limited to the configurations of the above-described embodiments, but are realized by various configurations within the scope of the claims. It is possible. For example, in the above embodiment, the fastening fixing portion 14 uses bolts 16 and nuts 17 as fastening members, but the present invention is not limited to these, and for example, other fastening members such as rivets and clampers are used. May be good.

Further, in the previous embodiment, the case where the buckling restraint brace 1 is attached to the connecting portion between the column 2 and the beam 3 has been described, but the present invention is not limited to this, and the connecting portion of various other vertical frame members and horizontal frame members is not limited to this. It is also possible to attach it to. Further, the present invention is applicable not only to the connection portion when the column 2 and the beam 3 are surface-joined, but also to the case where the beam is surface-joined to the beam connecting portion provided on the column. Specifically, the beam connecting portion provided on the column can be a hardware member (bracket) for connecting the beams, which is provided in advance on the side surface of the column by welding, bolt fixing, or the like. The beam connecting portion projects in the horizontal direction from the side surface of the column, and the beam can be face-joined by bringing the end face of the beam into surface contact with the end face and fixing the beam by bolting or the like. The present invention can also be applied to a connecting portion between a column and a beam fixed by a fixing method other than surface joining.

Further, in the above embodiment, two projecting portions (first projecting portion 11b and second projecting portion 11c) are provided on the first restraining material 11 side, but one or both of them are provided as the second restraining material 12. It may be provided in. Further, both the first restraint member 11 and the second restraint member 12 may be provided with a protrusion having a height of half. Further, the first protruding portion 11b and the second protruding portion 11c may not be provided integrally with the first restraining member 11 or the second restraining member 12. That is, the first protruding portion 11b and the second protruding portion 11c may be configured as separate members.

This reinforcing structure can be applied not only to buildings but also to other structures and machines such as structures, parking lots, bridges and steel towers.

1 Buckling restraint brace 2 Pillars (vertical frame material)
2a Through hole 2b Through hole 3 Beam (horizontal frame material)
3a Upper flange 3b Lower flange 3c Web 3d Fixed flange 3e Through hole 4 Bolt 5 Bolt 6 Nut 7 Bolt 10 Brace core material 10a Shaft part 10b 1st flange part 10c 2nd flange part 10d Through hole 10e Through hole 10f 1st expansion part 10g 2nd enlarged part 11 1st restraining material 11a Flat plate part 11b 1st protruding part 11c 2nd protruding part 11d through hole 11e through hole 12 2nd restraining material 12a contact surface 12b through hole 12c contact surface 12d through hole 13 welding fixing Part 14 Fastening and fixing part 15 Welded metal 16 Bolt 17 Nut 20 Swift restraint brace 30 Strain restraint brace

Claims (8)

A brace core material whose both ends are connected to a vertical frame material or a horizontal frame material, respectively.
A buckling restraint brace comprising a buckling restraining material that surrounds the brace core material and suppresses buckling of the brace core material.
The buckling restraining material has a first restraining material and a second restraining material.
The buckling restraining material includes a fixing portion for fixing the first restraining material and the second restraining material in a state where the brace core material is arranged between the first restraining material and the second restraining material. It is provided,
The fixing unit may possess a fastening fixing portion fixed with the fastening member, and a welded portion which is fixed by welding,
The fixing portion includes a plurality of the fastening fixing portions and the plurality of welding fixing portions.
A buckling restraint brace characterized in that the number of welded fixing portions is larger than the number of fastening fixing portions. The buckling restraint brace according to claim 1, wherein the fastening fixing portion is provided at an end portion of the buckling restraint member in the longitudinal direction. The buckling restraint brace according to claim 1 or 2, wherein the fastening fixing portion is provided on both sides of the brace core material in a lateral direction orthogonal to the longitudinal direction of the buckling restraint member. Of the pair of fastening and fixing portions provided on both sides of the brace core material, the fastening and fixing portion on the side far from the fixing portion between the vertical frame material and the horizontal frame material is the fastening and fixing portion on the side closer to the fixing portion. The buckling restraint brace according to claim 3, which is arranged in a region between two straight lines forming 60 ° on both sides with a straight line extending from the portion in the lateral direction as a center. The fixing portion is fixed in a state where the first restraining material and the second restraining material are in contact with each other.
Any one of claims 1 to 4, wherein the weld fixing portion is provided at a portion closer to the center in the width direction than the outer edge of the contact surface where the first restraining material and the second restraining material come into contact with each other. Buckling restraint brace described in. The buckling restraint brace according to any one of claims 1 to 5, wherein the fastening member is a bolt and a nut, a rivet, or a clamper. A reinforcing structure for a column-beam connection portion, wherein both ends of the buckling restraint brace according to any one of claims 1 to 6 are connected to a column or a beam. A building having a reinforcing structure for a beam-column connection according to claim 7.

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