JP2018127823A - Buckling Restrained Brace, Reinforcement Structure of Column Connecting Portion, and Building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buckling restrained brace capable of suppressing peeling of two buckling restraining members fixed to each other and suppressing buckling when a strong compressive force is applied to a brace core member.SOLUTION: A buckling restrained brace 1 comprises: a brace core member 10 whose both ends are respectively connected to a vertical frame member 2 or a horizontal frame member 3; and a buckling restraining member which surrounds the periphery of the brace core member 10. The buckling restraining member has a first restraining member 11 and a second restraining member 12. In the buckling restraining member, a fixing portion for fixing the first restraining member 11 and the second restraining member 12 is provided in a state where the brace core member 10 is disposed between the first restraining member 11 and the second restraining member 12. The fixing portion has: a fastening fixing portion 14 fixed by using fastening members 16 and 17; and a welding fixing portion 13 fixed by welding.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a buckling-restrained brace, a reinforcing structure for a column beam connecting portion using the buckling-restraining brace, and a building including the reinforcing structure for the column-beam connecting 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 disposed. When the building is about to deform, either a compressive force or a tensile force is applied to the reinforcing member along the longitudinal direction.

  If the reinforcing member is buckled by receiving a strong compressive force along its longitudinal direction, the building cannot be sufficiently reinforced. Therefore, a reinforcing member having a configuration including a buckling restraining material, which is a member for suppressing buckling of the brace core material, has been proposed in addition to the brace core material which is a member that directly receives a compressive force or a tensile force. The buckling restraint material is arranged around the brace core material so that when the brace core material subjected to compressive force tries to deform in a direction perpendicular to the longitudinal direction, a force is applied in a direction to suppress the deformation. It is a member. A reinforcing member provided with such a buckling restraining material is referred to as a “buckling restraining brace”. The force applied from the buckling restraint material to the brace core is also referred to as “buckling restraint force” below.

  Patent Document 1 below describes a buckling restrained brace having a configuration in which a brace core material is sandwiched between two buckling restraint members each formed in a plate shape, and the buckling restraint members are bolted to each other. . The buckling restrained brace having such a configuration can be formed by a simple operation of fastening a bolt. However, the two buckling restraints fixed to each other are not completely integrated. For this reason, depending on the magnitude of the compressive force applied to the brace core material, there is a possibility that the two buckling restraint materials are slightly displaced along the surfaces where they are in contact with each other. For this reason, when the brace core material is deformed by receiving a compressive force, it is not possible to apply a buckling restraining force of a size necessary for suppressing the deformation to the brace core material, thereby suppressing the buckling. It may not be able to be done sufficiently.

  Patent Document 2 describes a buckling restrained brace having a configuration in which two buckling restraining materials are fixed to each other by welding. Specifically, a buckling restraint brace having a configuration in which a part of each surface of two buckling restraint members is brought into contact with each other and the contact surfaces are partially welded and fixed is described. In such a structure, the deviation | shift etc. of buckling restraint material are suppressed compared with the case of bolt fixation.

Japanese Patent Laid-Open No. 2002-4436 Japanese Patent Laying-Open 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 is about to buckle and deform, the two buckling restraint materials are partially peeled apart. There is a possibility that. For this reason, there is room for improvement in terms of the effect of suppressing buckling when the brace core is subjected to compressive force.

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

The present invention has been made in order to solve the above problems, and the buckling restrained brace of the present invention includes a brace core material having both ends connected to a vertical frame material or a horizontal frame material,
A buckling restraint brace that surrounds the periphery of the brace core and suppresses buckling of the brace core, and a buckling restraint brace comprising:
The buckling restraint material has a first restraint material and a second restraint material,
The buckling restraint material includes a fixing portion that secures the first restraint material and the second restraint material in a state where the brace core material is disposed between the first restraint material and the second restraint material. Provided,
The fixing portion includes a fastening fixing portion fixed 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 and fixing portion is provided at an end portion in the longitudinal direction of the buckling restraint material.

  Moreover, in the buckling restraint brace of the present invention, it is preferable that the fastening and fixing portions are provided on both sides of the brace core material in the short direction perpendicular to the longitudinal direction of the buckling restraint material. .

  Further, in the buckling restrained brace of the present invention, of the pair of fastening fixing portions provided on both sides sandwiching the brace core material, on the side far from the fixing position of the vertical frame material and the horizontal frame material. The fastening and fixing portion is preferably disposed in a region between two straight lines that form 60 ° on both sides around a straight line extending in the short-side direction from the fastening and fixing portion closer to the fixing portion.

  Moreover, the reinforcing structure of the column-beam connecting portion according to the present invention is characterized in that both end portions of any of the above-described buckling-restraining braces are connected to the column or the beam.

  Moreover, the building of this invention is equipped with the reinforcement structure of said column beam connection part, It is characterized by the above-mentioned.

  According to the present invention, there is provided a buckling-restrained brace capable of suppressing the buckling when a strong compressive force is applied to the brace core material by suppressing the two buckling-restraining materials fixed to each other from being peeled off. can do.

It is a figure which shows the state by which the buckling restraint brace which concerns on one Embodiment of this invention was attached to the connection part of a column and a beam. FIG. 2 is an exploded view of the buckling restrained brace shown in FIG. 1. (A) is sectional drawing in the AA of the buckling restraint brace shown in FIG. 1, (b) is sectional drawing in the BB line. It is a figure which shows the state by which the buckling restraint brace which concerns on other embodiment of this invention was attached to the connection part of a column and a beam. It is a figure which shows the state by which the buckling restraint brace which concerns on other embodiment of this invention was 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. In addition, the same code | symbol is attached | subjected to the common structure in each figure.

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

  The column 2 is a steel prism with a space formed therein, and a plurality of through holes 2a for inserting the bolts 4 are formed on the side surfaces thereof.

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

  As shown in FIG. 1, the buckling restrained 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 restrained 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 below. Further, the buckling restrained brace 1 is fastened and fixed to the column 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 column 2.

  FIG. 2 is an exploded view of the buckling restrained brace 1. As shown in FIG. 2, the buckling restraint brace 1 includes 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 therebetween. As shown in FIG. 1, the first restraining material 11 and the second restraining material 12 are fixed by a welding fixing portion 13 and a fastening fixing portion 14, surround the brace core material 10, and suppress buckling of the brace core material 10. It constitutes a buckling restraint. 3A and 3B are cross-sectional views showing a state in which the buckling-restrained brace 1 is cut along a plane perpendicular to the longitudinal direction (z direction). FIG. FIG. 2 is a cross-sectional view at the position indicated by the line AA in FIG. 1, and FIG.

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

  The second flange portion 10 c is in contact with the side surface of the column 2. A plurality of through holes 10e are formed in the second flange portion 10c. Bolts 7 are inserted into these through-holes 10 e and fastened to through-holes 2 b other than the through-holes 2 a to which the beams 3 are fastened and fixed among the pillars 2, so that the lower end portion of the brace core material 10 is attached to the pillars 2. Fixed.

  Thus, the brace core material 10 has one end fixed to the beam 3 and the other end fixed to the column 2. For this reason, for example, when the building is about to undergo interlayer deformation so that the angle formed between the column 2 and the beam 3 changes, the shaft portion 10a of the brace core material 10 has a compressive force or tensile force along its longitudinal direction. Will be added. In other words, the shaft portion 10a of the brace core material 10 generates a force that resists the compression force or the pulling force so as to prevent the connecting 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 10g that gradually increase in width (the length in the x direction described later) toward the tip at both ends in the longitudinal direction. By providing such first enlarged portion 10f and second enlarged portion 10g, the strength of the portion exposed from the buckling restraining material in the shaft portion 10a can be increased, and the exposed portion can be made difficult to buckle. Thereby, the effect of the buckling restraint brace 1 which suppresses a deformation | transformation of a column beam connection part can be heightened.

  By the way, since the axial part 10a is a long plate-shaped member, if the above compressive force is added along the longitudinal direction, depending on the magnitude | size of the said compressive force, the axial part 10a may buckle. is there. Specifically, the entire shaft portion 10a may be 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 connecting portion between the column 2 and the beam 3 cannot be sufficiently reinforced. The 1st restraint material 11 and the 2nd restraint material 12 which are arrange | positioned so that the brace core material 10 may be pinched | interposed between them are members for suppressing the buckling of the above-mentioned axial part 10a.

  In the following description, as shown in FIG. 1, the longitudinal direction of the shaft portion 10a is defined as the z direction. Moreover, although the cross-sectional shape at the time of cut | disconnecting the axial part 10a in a surface perpendicular | vertical to az direction becomes a rectangle, let the direction along the long side of the said rectangle be an x direction. Further, a direction perpendicular to both the x direction and the z direction is taken as a y direction.

  The first restraining material 11 is made of a steel material, and includes 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 from the flat plate portion 11a in FIG. It has the 2nd protrusion part 11c.

  Each of the first projecting portion 11b and the second projecting portion 11c is formed by welding and fixing a rod-shaped body having a rectangular cross section to the flat plate portion 11a. As for the 1st protrusion part 11b and the 2nd protrusion part 11c, as for all, the longitudinal direction corresponds to the z direction, and both are mutually parallel. In this embodiment, the longitudinal direction length of the 1st protrusion part 11b is shorter than the longitudinal direction length of the 2nd protrusion part 11c. Further, the flat plate portion 11a of the first restraining material 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.

  A through hole 11d penetrating the first protrusion 11b and the flat plate part 11a is formed in the first protrusion 11b at a position corresponding to a fastening and fixing part 14 described later. Similarly, a through hole 11e penetrating the second projecting portion 11c and the flat plate portion 11a is formed in the second projecting portion 11c at a position corresponding to the fastening and fixing portion 14.

  The distance between the first protrusion 11b and the second protrusion 11c (interval along the x direction) is slightly wider than the width of the shaft part 10a along the x direction. Moreover, the height (length along the y direction) of the 1st protrusion part 11b and the 2nd protrusion part 11c is mutually the same, and all are slightly larger than the thickness of the axial part 10a. Moreover, the longitudinal direction (z direction) length of the 1st restraint material 11 and the 2nd restraint material 12 is shorter than the length of the axial part 10a.

  The first constraining member 11 has the first projecting portion 11b and the second projecting portion with the surface of the flat plate portion 11a on which the first projecting portion 11b and the second projecting portion 11c are formed facing the shaft portion 10a. The shaft portion 10a is accommodated between 11c.

  The second restraint material 12 is a flat plate formed of the same steel material as the first restraint 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 constraining material 12 is disposed so as to overlap the flat plate portion 11a when viewed along the y direction.

  The second constraining material 12 is in contact with the first constraining material 11 in a state where a part of the lower surface in FIG. 2 is in contact with the upper surface of the first projecting portion 11b and the upper surface of the second projecting portion 11c. 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. The first restraining material 11 and the second restraining material 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. In addition, the 1st restraint material 11 and the 2nd restraint material 12 do not need to contact | abut. That is, you may fasten and fix with fastening members, such as a volt | bolt and a nut, in the state which left the clearance gap between the 1st restraint material 11 and the 2nd restraint material 12. FIG. Moreover, a welding metal may be arrange | positioned in the clearance gap between the 1st restraint material 11 and the 2nd restraint material 12, and the 1st restraint material 11 and the 2nd restraint material 12 may be fixed by welding.

  As shown in FIG. 2 and FIGS. 3A and 3B, in the second restraint member 12, a plurality of through holes 12 b are formed in the contact surface 12 a that is a region in contact with the upper surface of the first projecting portion 11 b. Is formed. In the second restraining material 12, a plurality of through holes 12d are formed in the contact surface 12c, which is a region that contacts the upper surface of the second protrusion 11c. Bolts can be inserted into the through holes 12b and the through holes 12d, and can also be used for plug welding described later.

  In this embodiment, the welding fixing part 13 is formed in all the through holes 12b and 12d except the position of the fastening fixing part 14. In addition, the position which forms the fastening fixing | fixed part 14 and the welding fixing | fixed part 13 among the through-holes 12b and 12d can be changed suitably, and it is good also as a structure which does not use some through-holes 12b and 12d. Moreover, it is preferable that the number of the welding fixing parts 13 is larger than that of the fastening fixing parts 14 from the viewpoint of exerting a good balance between the effect of preventing the peeling of the fastening fixing parts 14 and the stiffening effect of the welding fixing parts 13. .

  In the weld 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 restraint material 12 is in contact with the upper surface of the first protrusion 11b. 2 The restraint material 12 and the 1st protrusion part 11b are being fixed by welding. That is, the 2nd restraint material 12 and the 1st protrusion part 11b are being 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 adopt such an aspect. For example, the aspect in which the weld metal 15 does not exist in the center part of the through-hole 12b may be sufficient. In this embodiment, the welding fixing portion 13 is configured by plug welding, but is not limited thereto, and may be configured by groove welding, fillet hole welding, or fillet groove welding. Moreover, in the some welding fixing | fixed part 13, you may give a different kind of welding with a place.

  In addition, by filling the inside of the through-hole 12d with the weld metal 15 in a state where the contact surface 12c of the second restraint material 12 is in contact with the upper surface of the second protrusion 11c, The second protrusion 11c is fixed by welding.

  In this embodiment, the second restraint as described above is also applied to the welding and fixing between the flat plate portion 11a and the first protruding portion 11b and the welding and fixing between the flat plate portion 11a and the second protruding portion 11c. This is performed by the same configuration as the welding fixation between the material 12 and the first protruding portion 11b and the like.

  As shown in FIG. 3B, in the fastening and fixing portion 14, the through hole 11 d that communicates with the upper surface of the first projecting portion 11 b in contact with the contact surface 12 a of the second restraining material 12. The second restraint member 12 and the first restraint member 11 are fastened and fixed by inserting bolts 16 through the through holes 12b and fastening them with nuts 17. Further, with the abutment surface 12c of the second restraining member 12 in contact with the upper surface of the second projecting portion 11c, a bolt 16 is inserted into the through hole 11e and the through hole 12d communicating with each other with a nut 17. By fastening, the second restraining material 12 and the first restraining material 11 are fastened and fixed. The fastening and fixing portion 14 can easily increase the fixing strength by using fastening members such as bolts 16 and nuts 17 as members made of a high-strength material. On the other hand, in order to increase the strength of the weld fixing portion, not only the strength of the weld metal but also the material to be fixed, that is, the first restraint material 11 and the second restraint material 12 as a whole, a material having high strength must be used. I must. Therefore, the buckling prevention effect of the buckling restraint brace 1 can be easily increased by providing the fastening and fixing portion 14 without increasing the strength of the entire first restraint member 11 and the second restraint member 12.

  In the buckling restraint brace 1 of the present embodiment, the positional 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 and fixing portion 14, when the brace core material 10 of the buckling restraint brace 1 receives an excessive compressive force, the first restraint material 11 and the second restraint material 12 are prevented from being peeled off. 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 is about to deform in the buckling direction, a strong buckling restraint force is applied to the first restraint material 11 or the second restraint material 12. To the brace core 10. As a result, buckling of the brace core material 10 is suppressed.

  Moreover, in the buckling restraint brace 1 of this embodiment, as shown to Fig.3 (a), all the several through-holes 12b formed in the 2nd restraint material 12 are x direction among contact surfaces 12a. Is formed at a central position. Further, the plurality of through holes 12d formed in the second restraint material 12 are all formed at positions that are the center in the x direction on the contact surface 12c. In other words, the welding fixing portion 13 is located at a portion closer to the center than the outer edges of the contact surfaces 12a and 12c among the contact surfaces 12a and 12c with which the first restraint material 11 and the second restraint material 12 contact. Is provided. That is, the welding location of the 1st restraint material 11 and the 2nd restraint material 12 does not overlap with the outer edge of both contact surface 12a, 12c, and the welding location is surrounded by contact surface 12a, 12c. It is in a state.

  For this reason, compared with the case where, for example, only a part of the outer edges of the contact surfaces 12a and 12c are welded, a region of the contact surfaces 12a and 12c that is in contact with each other but not integrated ( The area other than the welded area) is relatively narrow. As a result, the degree of freedom of deformation that relatively displaces the first restraining material 11 and the second restraining material 12 is small, and the first restraining material 11 and the second restraining material 12 come into contact with each other. The first constraining material 11 and the second constraining material 12 are displaced along the surfaces 12a and 12c (for example, along the x direction) and in a direction (y direction) perpendicular to the contact surfaces 12a and 12c. The effect of suppressing that at least one of them is deformed and separated from each other is high.

  In addition, it is preferable that the fastening fixing | fixed part 14 is formed in the edge part in the longitudinal direction of a buckling restraint material. Here, the “end portion in the longitudinal direction” of the buckling restraint material is, for example, a region of one third on both sides excluding the central region when the buckling restraint material is divided into three equal parts in the longitudinal direction. To do. Compared with the central portion, the end portion in the longitudinal direction of the buckling restraint member is particularly easily subjected to a force for peeling off the first restraint member 11 and the second restraint member 12 due to buckling deformation of the brace core member 10. The curvature when buckled and deformed increases. At such an end portion, the fastening fixing portion 14 that is strong against the force in the separating direction to peel off the first restraining material 11 and the second restraining material 12 is arranged to suppress peeling, and as a result, buckling restraint. You can increase your power. Note that the length in the longitudinal direction of the buckling restraint material is a length connecting the center points of one end and the other end.

  Moreover, it is preferable that the fastening fixing | fixed part 14 is arrange | positioned at the both sides which pinched | interposed the brace core material 10 in the transversal direction (this embodiment x direction) orthogonal to a longitudinal direction (z direction). 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 and fixing portions 14 located on both sides of the brace core material 10 are provided at both end portions in the longitudinal direction of the buckling restraint material. The fastening and fixing portions 14 are preferably provided on both sides in the short direction across the brace core material 10, but are not necessarily provided on both sides, and are provided only where the buckling restraint material is displaced and the fracture starts. Alternatively, for example, only the side close to the fixing location where the column 2 and the beam 3 are fixed (the short side of the second restraining material 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 location in the short direction, or the fastening and fixing portions 14 may be provided only at one end. Moreover, as shown in FIG. 1, the buckling restraint material is trapezoidal in this 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 and fixing portion 14 is provided in the vicinity of the perpendiculars respectively extending from both side end portions of the upper side to the lower side, the deformation of the trapezoidal buckling restraint material is changed. 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 portion where the column 2 and the beam 3 are fixed (the short side of the second restraining material 12 having a substantially trapezoidal shape). It is provided in the through hole 12b at both ends in the direction.

  Here, in this embodiment, as shown in FIG. 1, the angle θ <b> 1 with respect to the column 2 of the buckling restrained brace 1 is attached to be smaller than 45 °, specifically about 20 °. In such a case, fastening fixation on the column 2 side (lower side) in the contact surface 12c on the side far from the fixing location of the column 2 and the beam 3 (long side side of the second restraining material 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 longitudinal end, and the fastening fixing portion 14 on the beam 3 side (upper side) is the through hole at the longitudinal end. 12d is preferably provided.

  As shown in FIG. 1, among the pair of fastening fixing portions 14 provided on both sides of the brace core material 10, the fastening fixing portion 14 located on the contact surface 12 c on the side far from the fixing portion between the column 2 and the beam 3. Are arranged in a region between the straight line D and the straight line E that form 60 ° on both sides around the straight line C extending in the x direction from the fastening and fixing portion 14 located on the contact surface 12a on the side close to the fixing part. It 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, the force for peeling off the first restraining material 11 and the second restraining material 12 Is particularly easy to add. For this reason, the effect which suppresses that the 1st restraint material 11 and the 2nd restraint material 12 are peeled can be heightened by arrange | positioning the fastening fixing | fixed part 14 in the said area | region.

  Hereinafter, another embodiment of the present invention will be described. Note that portions having the same basic functions as those of the above-described embodiment are denoted by the same reference numerals in the drawing and description thereof is omitted.

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

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

  FIG. 5 shows the buckling-restrained brace 30 attached so that the angle θ3 with respect to the column 2 is about 70 °. In such a case, the fastening fixing portion 14 on the column 2 side (lower side) of 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 and fixing portion 14 located on the contact surface 12c on the side far from the fixing location between the pillar 2 and the beam 3 is the fastening and fixing portion located on the contact surface 12a on the side close to the fixing location. It is preferably arranged in a region between the straight line D and the straight line E that forms 60 ° on both sides around the straight line C extending in the x direction from 14.

  The buckling restrained brace, the reinforcing structure, and the building according to the present invention are not limited to the configuration of the above-described embodiment, and can be realized by various configurations without departing from the content described in the claims. It is possible. For example, in the previous embodiment, the fastening and fixing portion 14 uses the bolt 16 and the nut 17 as the fastening member, but is not limited thereto, and for example, uses other fastening members such as a rivet and a clamper. Also good.

  In the previous embodiment, the case where the buckling-restrained brace 1 is attached to the connection portion between the column 2 and the beam 3 has been described. However, the present invention is not limited to this, and connection portions of other various vertical frame materials and horizontal frame materials. It is also possible to attach to. Further, the present invention is not limited to the connection portion in the case where the column 2 and the beam 3 are surface-joined, but can also be applied to the case where the beam is surface-joined with respect to the beam connecting portion provided in the column. Specifically, the beam connecting portion provided on the column may be a hardware member (bracket) for connecting the beam, which is provided in advance on the side surface of the column by welding or bolt fixing. The beam connecting portion protrudes in the horizontal direction from the side surface of the column, and the beam can be surface-bonded by bringing the end surface of the beam into surface contact with the end surface and fixing by bolt fixing or the like. The present invention can also be applied to a column-beam connection portion fixed by a fixing method other than surface bonding.

  In the previous embodiment, two protrusions (the first protrusion 11b and the second protrusion 11c) are provided on the first restricting member 11 side, but either one or both of the two restricting members 12 are provided. May be provided. Moreover, you may provide the protrusion part of a half height in both the 1st restraint material 11 and the 2nd restraint material 12. FIG. Further, the first projecting portion 11 b and the second projecting portion 11 c may not be provided integrally with the first restraining material 11 or the second restraining material 12. That is, you may comprise the 1st protrusion part 11b and the 2nd protrusion part 11c as another member.

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

1 Buckling restraint brace 2 Column (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 portion 10b First flange portion 10c Second flange portion 10d Through hole 10e Through hole 10f First enlarged portion 10g 2nd expansion part 11 1st restraint material 11a Flat plate part 11b 1st protrusion part 11c 2nd protrusion part 11d Through-hole 11e Through-hole 12 2nd restraint material 12a Contact surface 12b Through-hole 12c Contact surface 12d Through-hole 13 Welding fixation Part 14 Fastening fixing part 15 Weld metal 16 Bolt 17 Nut 20 Buckling restraint brace 30 Buckling restraint brace

Claims (6)

A brace core material whose both ends are respectively connected to a vertical frame material or a horizontal frame material;
A buckling restraint brace that surrounds the periphery of the brace core and suppresses buckling of the brace core, and a buckling restraint brace comprising:
The buckling restraint material has a first restraint material and a second restraint material,
The buckling restraint material includes a fixing portion that secures the first restraint material and the second restraint material in a state where the brace core material is disposed between the first restraint material and the second restraint material. Provided,
The said fixing | fixed part has the fastening fixing | fixed part fixed using the fastening member, and the welding fixing | fixed part fixed by welding, The buckling restraint brace characterized by the above-mentioned.   The buckling restraint brace according to claim 1, wherein the fastening and fixing portion is provided at an end portion in a longitudinal direction of the buckling restraint member.   The buckling restraint brace according to claim 1 or 2, wherein the fastening and fixing portion is provided on both sides of the brace core material in a short direction perpendicular to the longitudinal direction of the buckling restraint member.   Of the pair of fastening fixing portions provided on both sides of the brace core material, the fastening fixing portion on the side far from the fixing portion between the vertical frame member and the horizontal frame member is the fastening fixing on the side close to the fixing portion. The buckling restrained brace according to claim 3, wherein the brace-restraining brace is disposed in a region between two straight lines forming 60 ° on both sides with a straight line extending in a short direction from a portion.   The reinforcement structure of the column beam connection part by which the both ends of the buckling restraint brace as described in any one of Claims 1-4 are connected to the column or the beam.   The building provided with the reinforcement structure of the column beam connection part of Claim 5.

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