JP6124702B2 - Buckling restraint brace - Google Patents

Description

  The present invention relates to a buckling-restrained brace for reinforcing a building by placing it between columns and beams.

  For the purpose of reinforcing the 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 deform, either a compressive force or a tensile force is applied to the reinforcing member along its longitudinal direction.

  The reinforcing member may buckle when receiving a strong compressive force along its longitudinal direction, and in that case, the building cannot be sufficiently reinforced. Therefore, a reinforcing member having a configuration including a buckling constraining material, which is a member for suppressing buckling of the brace core material, has been proposed and put into practical use separately from the brace core material which is a member that directly receives a compressive force or a tensile force. ing. 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-restraining materials each formed in a plate shape, and the buckling-restraining materials 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 restraining materials joined together 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. In addition, the bolt may be deformed so as to extend along the axial direction. 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.

  On the other hand, the following Patent Document 2 describes a buckling restrained brace having a configuration in which two buckling restraining materials are welded together. Specifically, a buckling restrained brace having a configuration in which a part of each surface of two buckling restraint members is brought into contact with each other and welded along a part of an outer edge of the contact surface is described. . In such a configuration, since a deviation or the like between the buckling restraining materials is suppressed as compared with the case of bolt joining, a relatively strong buckling restraining force is applied to the brace core material. In other words, even if a relatively strong compressive force is applied to the brace core material, buckling of the brace core material can be suppressed.

JP 2012-92505 A JP 2012-229572 A

  As described above, the buckling restraint brace described in Patent Document 2 has a configuration in which two buckling restraint materials are brought into contact with each other, and both are welded to each other at the contact surface. However, only the outer edge (a part) of the contact surface is joined, and most of the contact surface is merely in surface contact. For this reason, when the brace core material subjected to compressive force is about to be deformed, the two buckling restraining materials may be separated from each other on the contact surface or may be displaced along the contact surface. Such can still occur. As described above, when the two buckling restraining materials are relatively displaced, the deformation of the brace core material is not sufficiently suppressed, and the buckling may occur.

  The present invention has been made in view of such problems, and its purpose is to suppress the relative displacement of the two buckling restraint members joined to each other and to provide a strong compressive force to the brace core material. It is an object of the present invention to provide a buckling restrained brace that can suppress buckling when added.

  In order to solve the above problems, a buckling restrained brace according to the present invention surrounds a brace core material whose both ends are respectively connected to a column or a beam and the brace core material, thereby suppressing the buckling of the brace core material. A buckling restraint brace comprising: a buckling restraint material comprising: a first restraint material; and a second restraint material, wherein the brace core material is bound to the first restraint material. The first restraining material and the second restraining material are welded to each other in a state of being sandwiched between a material and the second restraining material, and the first restraining material and the second restraining material are joined together. The material is characterized by being welded to each other at a portion closer to the center than the outer edge of the abutting surface among the abutting surfaces where a part of each surface abuts each other.

  The buckling restraint brace according to the present invention includes a brace core material and a buckling restraint material. The brace core is a member whose both ends are respectively connected to columns or beams, and when the building is about to deform, it receives the compressive or tensile force directly from the columns and beams along its longitudinal direction. It is a member.

  The buckling restraining material is a member that surrounds the periphery of the brace core material and suppresses the buckling of the brace core material. That is, it is not a member for directly receiving a compressive force or the like from a column or beam, but a member for receiving a force from the brace core when the brace core is deformed in a buckling direction. In other words, it is a member arranged to suppress buckling of the brace core material by applying a force (buckling restraining force) in a direction perpendicular to the longitudinal direction of the brace core material from around the brace core material. .

  The buckling restraint material has a first restraint material and a second restraint material. The buckling restraint material has a configuration in which the first restraint material and the second restraint material are welded together with the brace core material being sandwiched between the first restraint material and the second restraint material.

  The first constraining material and the second constraining material are welded to each other at a portion closer to the center than the outer edge of the abutting surface among the abutting surfaces where a part of each surface abuts each other. That is, the welding location between the first restraining material and the second restraining material does not overlap the outer edge of the contact surface of both, and the entire periphery of the welding location is surrounded by the contact surface. ing.

  For this reason, compared with the case where only a part of the outer edge of the contact surface is welded, for example, a region of the contact surface that is in contact with each other but not integrated (region other than the welded portion) Can be made relatively narrow. As a result, the degree of freedom of deformation in which the first restraining material and the second restraining material are relatively displaced is small, and the first restraining material and the second restraining material are along the contact surface. Any deviation or displacement (separation) in a direction perpendicular to the contact surface is suppressed.

  Because of this configuration, when a strong compressive force is applied to the brace core and the brace core tries to deform in the buckling direction, a relatively strong buckling restraint force is applied from the buckling restraint to the brace core. It is done. As a result, buckling of the brace core material can be suppressed.

  In the buckling-restrained brace according to the present invention, it is also preferable that the contact surface is perpendicular to a surface of the brace core material that is closest to the contact surface.

  In this preferable aspect, the contact surface with which the first restraint material and the second restraint material are in contact with each other is perpendicular to the surface of the brace core material that is closest to the contact surface. That is, it arrange | positions so that it may protrude outward from the surface of a brace core material. For this reason, when the first restraining material and the second restraining material are overlapped and welded from one to the other, the direction in which the welding heat is mainly transmitted is not the direction toward the surface of the brace core material. The direction is substantially parallel to the surface of the brace core. As a result, since the inflow of welding heat to the brace core material is suppressed, the temperature of the brace core material does not rise excessively and the core material is not thermally deformed and the properties of the metal are not deteriorated.

  Further, in the buckling-restrained brace according to the present invention, a portion of the brace core material other than both ends connected to the column or beam is a thin plate whose cross-sectional shape perpendicular to the longitudinal direction is a rectangle. And it is also preferable that the said contact surface is arrange | positioned in the position which becomes an outer side rather than the said brace core material in the direction along the long side of the said rectangle.

  In this preferred embodiment, portions of the brace core material other than both ends connected to the columns or beams are thin plates whose cross-sectional shape perpendicular to the longitudinal direction is a rectangle. Further, the contact surface where the first restraining material and the second restraining material are in contact with each other is disposed at a position outside the brace core material in the direction along the long side of the rectangle. That is, when the thin brace core material is viewed from a direction perpendicular to the wider surface, the contact surface is disposed at a position that does not overlap with the brace core material, and the first restraint is provided on the contact surface. The material and the second restraint material are welded together.

  By making the cross-sectional shape of the brace core material rectangular, the thickness of the buckling restraint brace can be reduced. Further, since the first constraining material and the second constraining material are welded to each other at a position that does not overlap with the thickness direction (the direction along the short side of the rectangle), the thickness of the buckling constraining brace is further increased. Can be thinned.

  Further, in the buckling restrained brace according to the present invention, the first restraining material is formed with a projecting portion projecting toward the second restraining material, and the contact surface is formed at the tip of the projecting portion. It is also preferable that

  In this preferred embodiment, the first restraining material is formed with a projecting portion that projects toward the second restraining material, and the contact surface is formed at the tip of the projecting portion. By setting it as such a structure, the distance from the surface side of a 2nd restraint material to a contact surface can be made small. In other words, the depth from the surface of the buckling restraint brace to the welded portion can be reduced. For this reason, it becomes possible to perform easily the welding operation for forming a buckling restraint brace.

  Further, in the buckling restrained brace according to the present invention, the first restraining member has a flat surface partly opposed to the brace core material, and the protruding portion is formed on the brace core material of the flat surface. It is also preferable that the plate-like body is formed by welding and joining to the non-opposing portions.

  In this preferred embodiment, the first restraining member has a flat surface partially facing the brace core material. Moreover, the protrusion part is formed by welding and joining a plate-shaped object with respect to the part which does not oppose a brace core material among the said flat surfaces.

  It is not necessary to prepare a member having a complicated shape, and a protruding portion that protrudes toward the second restraint is formed by a simple method of welding and joining a plate-like body to the flat surface of the first restraint. Can do.

  In the buckling restraint brace according to the present invention, the first restraint material and the second restraint material are welded together by any one of plug welding, groove welding, fillet hole welding, and fillet groove welding. It is also preferable.

  In this preferred embodiment, the first restraining material and the second restraining material are welded to each other by any one of plug welding, groove welding, fillet hole welding, and fillet groove welding. For this reason, compared with the case where the outer peripheral part of the contact surface of a 1st restraint material and a 2nd restraint material is joined by fillet welding, a welding operation can be performed easily and in a short time.

  According to the present invention, it is possible to suppress the buckling when the two buckling restraint members joined to each other are relatively displaced and to suppress the buckling when a strong compressive force is applied to the brace core material. Restraint braces can be provided.

It is a figure which shows the state by which the buckling restraint brace which concerns on 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. It is sectional drawing which shows a mode that the buckling restraint brace shown in FIG. 1 was cut | disconnected by the surface perpendicular | vertical with respect to the longitudinal direction. It is sectional drawing for demonstrating a mode that a buckling restraint material deform | transforms in the buckling restraint brace which concerns on the comparative example of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  FIG. 1 is a diagram illustrating a state in which a buckling restrained brace 100 according to an embodiment of the present invention is attached to a connection portion between a column 200 and a beam 300. In FIG. 1, a column 200 arranged along the vertical direction and a beam 300 arranged along the horizontal direction are fastened and fixed by a plurality of bolts BT1.

  The pillar 200 is a steel prism having a space formed therein, and a plurality of through holes 210 for inserting the bolts BT1 are formed on the side surfaces thereof.

  The beam 300 is an H-shaped steel having a pair of flanges 310 and 320 that are parallel to each other and a web 330 that connects them. A fixing flange 340 perpendicular to both the flanges 310 and 320 and the web 330 is welded and fixed to the longitudinal end portion of the beam 300. In addition, a plurality of through holes 341 are formed in the fixing flange 340 at positions corresponding to the plurality of through holes 210 formed in the column 200. The beam 300 is fixed to the column 200 by inserting and fastening the bolt BT1 into the through hole 210 and the through hole 341 with the fixing flange 340 in contact with the side surface of the column 200.

  As shown in FIG. 1, the buckling restrained brace 100 is a member for reinforcing the connection portion by being attached as a cane at the connection portion between the column 200 and the beam 300. The buckling restrained brace 100 is fastened and fixed to the beam 300 by a bolt BT2 with its upper end in contact with the flange 320 of the beam 300 from below. Further, the buckling restrained brace 100 is fastened and fixed to the column 200 by a bolt BT3 with the lower end of the brace restraining brace 100 being in contact with the side surface of the column 200.

  FIG. 2 is an exploded view of the buckling restrained brace 100. As shown in FIG. 2, the buckling restrained brace 100 includes a brace core material 110, and a first restraint material 150 and a second restraint material 170 arranged so as to sandwich the brace core material 110 therebetween.

  The brace core material 110 is formed of a steel material having a yield point lower than that of the column 200 or the beam 300, and includes a thin plate-shaped shaft portion 111 and flange portions 120 that are welded and fixed to both longitudinal ends of the shaft portion 111, 130. The flange portion 120 is a flange that comes into contact with the flange 320 of the beam 300 from below. A plurality of through holes 121 are formed in the flange portion 120. The upper end of the brace core material 110 is fixed to the beam 300 by inserting the bolt BT2 into the through holes 121 and fastening them.

  The flange portion 130 is a flange that abuts against the side surface of the column 200. A plurality of through holes 131 are formed in the flange portion 130. The lower end portion of the brace core material 110 is fixed to the column 200 by inserting the bolt BT3 into the through holes 131 and fastening them.

  Thus, the brace core material 110 has one end fixed to the beam 300 and the other end fixed to the column 200. For this reason, for example, when the building is to be deformed so that the angle formed between the column 200 and the beam 300 changes, the shaft portion 111 of the brace core material 110 has a compressive force or a tensile force along its longitudinal direction. Join. In other words, the shaft portion 111 of the brace core material 110 generates a force that resists the compression force or the pulling force so as to prevent the connecting portion between the column 200 and the beam 300 from being deformed. It can be said that it is a member for.

  By the way, since the axial part 111 is a long plate-shaped member, if the above compressive force is added along the longitudinal direction, the axial part 111 may buckle depending on the magnitude | size of the said compressive force. is there. Specifically, the entire shaft portion 111 is arcuate so that the central portion of the shaft portion 111 is displaced along a direction perpendicular to the surface of the shaft portion 111 (the direction indicated by the arrow AR1 in FIG. 2). There is a possibility that it will be deformed (overall buckling). Alternatively, there is a possibility that the shaft portion 111 is locally deformed so that only a part of the shaft portion 111 is displaced in the direction indicated by the arrow AR1 (local buckling). When such buckling occurs, the connection portion between the column 200 and the beam 300 cannot be sufficiently reinforced. The first restraining material 150 and the second restraining material 170 arranged so as to sandwich the brace core material 110 are members for suppressing the buckling of the shaft portion 111 as described above.

  In the following description, the longitudinal direction of the shaft portion 111 is the z direction. Moreover, although the cross-sectional shape at the time of cut | disconnecting the axial part 111 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 member 150 is made of a steel material and has a flat plate portion 151 substantially parallel to the shaft portion 111 and a pair of protruding portions 161 and 165 protruding upward from the flat plate portion 151 (in FIG. 2). ing. The protruding portions 161 and 165 are each formed by welding and fixing a rod-shaped body having a rectangular cross section to the flat plate portion 151. The protrusions 161 and 165 both have the longitudinal direction coinciding with the z direction, and both are parallel to each other. The interval between the protrusion 161 and the protrusion 165 (interval along the x direction) is slightly wider than the width of the shaft portion 111 along the x direction. Further, the length of the first restraining member 150 in the z direction is slightly shorter than the length of the shaft portion 111. Further, the heights of the protrusions 161 and 165 (the length along the y direction) are the same, and both are larger than the thickness of the shaft portion 111.

  The first restraining member 150 has the shaft portion 111 between the protruding portion 161 and the protruding portion 165 with the surface 152 of the flat plate portion 151 where the protruding portions 161 and 165 are formed facing the shaft portion 111 side. It is in the stowed state. In other words, a part (substantially central part along the x direction) of the surface 152 faces the shaft part 111, and the protruding parts 161 and 165 are formed in a part of the surface 152 that does not face the shaft part 111. ing.

  The second restraint material 170 is a flat plate formed of the same steel material as the first restraint material 150. The second restraint material 170 has the same shape as the flat plate portion 151 of the first restraint material 150 and is parallel to the flat plate portion 151. The second constraining material 170 is disposed so as to overlap with the flat plate portion 151 when viewed along the y direction.

  The second restraint member 170 is in a state where a part of the lower surface 172 in FIG. 2 is in contact with the upper end surface 162 of the projecting portion 161 and the upper end surface 166 of the projecting portion 165, respectively. It is welded to the restraining material 150. With this configuration, the shaft portion 111 of the brace core material 110 is sandwiched between the first restraining material 150 and the second restraining material 170 from both sides in the y direction.

  As shown in FIG. 2, a plurality of through holes 175 are formed in a region (hereinafter also referred to as “contact surface 173”) that contacts the upper end surface 162 of the surface 172 of the second restraint member 170. Yes. A plurality of through-holes 177 are formed in a region of the surface 172 of the second restraining member 170 that contacts the upper end surface 166 (hereinafter also referred to as “contact surface 174”).

  All of the through holes 175 are formed at positions that are closer to the center than the outer edge of the contact surface 173. That is, the entire lower edge (in FIG. 2) of the through-hole 175 does not overlap with the outer edge of the contact surface 173, and is surrounded by the outer edge of the contact surface 173.

  The same applies to all the through holes 177. All the through-holes 177 are formed at positions closer to the center than the outer edge of the contact surface 174. That is, the entire lower edge (in FIG. 2) of the through-hole 177 does not overlap the outer edge of the contact surface 174, and is surrounded by the outer edge of the contact surface 174.

  As will be described later, the second restraint member 170 and the protruding portion 161 are joined by plug welding in all the through holes 175. Moreover, the 2nd restraint material 170 and the protrusion part 165 are joined by plug welding in all the through-holes 177. FIG.

  When a compressive force is applied along the longitudinal direction (z direction) of the shaft portion 111 and the shaft portion 111 is deformed so as to buckle, the surface of the shaft portion 111 (surface perpendicular to the y direction) A part thereof comes into contact with the first restraining material 150 or the second restraining material 170 from the inside, and receives a force that suppresses the deformation. As a result, since the buckling of the shaft portion 111 is suppressed, the connection portion between the column 200 and the beam 300 is reinforced with sufficient strength.

  Thus, the 1st restraint material 150 and the 2nd restraint material 170 suppress the buckling of the axial part 111 by arrange | positioning in the state which enclosed the circumference | surroundings of the axial part 111. FIG. That is, these are not members for directly receiving the compressive force or the like from the column 200 or the beam 300 but members for receiving the force from the shaft portion 111 when the shaft portion 111 is deformed in a buckling direction. is there. In other words, buckling of the shaft portion 111 is suppressed by applying a buckling restraining force in the direction (y direction) perpendicular to the longitudinal direction (z direction) of the shaft portion 111 from the periphery of the shaft portion 111. It is the member arranged so.

  Next, the welding connection between the first restraining material 150 and the second restraining material 170 will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a state in which the buckling restrained brace 100 is cut along a plane perpendicular to the longitudinal direction (z direction).

  As shown in FIG. 3, the plurality of through-holes 175 formed in the second restraint member 170 are all formed at positions that are central in the x direction on the contact surface 173. By filling the inside of the through hole 175 with the weld metal BD1 in a state where the contact surface 173 of the second restraint material 170 is in contact with the upper end surface 162 of the projection 161, the second restraint material 170 and the projection 161 is welded. That is, the second restraint material 170 and the protrusion 161 (first restraint material 150) are joined by plug welding. In FIG. 3, the entire inside of the through hole 175 is filled with the weld metal BD1, but it is not always necessary to adopt such a mode. For example, an aspect in which the weld metal BD1 does not exist in the central portion of the through hole 175 may be employed.

  The plurality of through-holes 177 formed in the second restraining material 170 are all formed at positions that are central in the x direction on the contact surface 174. The inside of the through hole 177 is filled with the weld metal BD2 in a state where the contact surface 174 of the second restraint material 170 is in contact with the upper end surface 166 of the projecting portion 165. 165 is welded. That is, the second restraint material 170 and the protruding portion 165 (first restraint material 150) are joined by plug welding.

  In the present embodiment, the second constraining material 170 and the protrusion as described above are also applied to the welding joint between the flat plate portion 151 and the protruding portion 161 and the welding joint between the flat plate portion 151 and the protruding portion 165. The configuration is the same as that of the welding joint with the portion 161 and the like.

  The flat plate portion 151 is in a state in which a part of the upper surface 152 (in FIG. 3) is in contact with the lower end surface 163 of the projecting portion 161 and the lower end surface 167 of the projecting portion 165, respectively. And the protrusion 165 are welded. A plurality of through holes 155 are formed in a region of the flat plate portion 151 that contacts the lower end surface 163 (hereinafter also referred to as “contact surface 153”). A plurality of through holes 157 are formed in a region of the flat plate portion 151 that contacts the lower end surface 167 (hereinafter also referred to as “contact surface 154”).

  All of the through holes 155 are formed at positions closer to the center than the outer edge of the contact surface 153. That is, the entire edge (the upper edge in FIG. 3) of the through hole 155 that contacts the contact surface 153 does not overlap the outer edge of the contact surface 153, and is surrounded by the outer edge of the contact surface 153. ing.

  The same applies to all the through holes 157. All of the through holes 157 are formed at positions closer to the center than the outer edge of the contact surface 154. That is, the entire edge (upper edge in FIG. 3) of the through hole 157 contacting the contact surface 154 does not overlap the outer edge of the contact surface 154, and is surrounded by the outer edge of the contact surface 154. ing.

  As shown in FIG. 3, the plurality of through-holes 155 formed in the flat plate portion 151 are all formed in the center of the contact surface 153 in the x direction. By filling the inside of the through hole 155 with the weld metal BD3 in a state where the contact surface 153 of the first restraining material 150 is in contact with the lower end surface 163 of the protrusion 161, the flat plate portion 151 and the protrusion 161 Are welded together. That is, the flat plate portion 151 and the protruding portion 161 are joined by plug welding.

  The plurality of through-holes 157 formed in the flat plate portion 151 are all formed at the center of the contact surface 154 in the x direction. By filling the inside of the through hole 157 with the weld metal BD4 in a state where the contact surface 154 of the flat plate portion 151 is in contact with the lower end surface 167 of the protrusion 165, the second restraining material 170 and the protrusion 165 Are welded together. That is, the first restraining material 150 and the protruding portion 165 are joined by plug welding.

  As described above, in the buckling restraint brace 100 according to the present embodiment, the first restraint member 150 and the second restraint member 170 have a contact surface 173 in which a part of each surface is brought into contact with each other. Of the 174, the contact surfaces 173 and 174 are welded together at portions closer to the center than the outer edges. That is, the welding location of the first restraining material 150 and the second restraining material 170 does not overlap with the outer edge of the contact surface of the both, and the entire periphery of the welding location (the entire BD1, BD2) is the contact surface. 173 and 174.

  For this reason, compared with the case where, for example, only a part of the outer edges of the contact surfaces 173 and 174 are welded, the regions of the contact surfaces 173 and 174 that are in contact with each other but are not integrated ( The area other than the welded area) is relatively narrow. As a result, the degree of freedom of deformation in which the first restraining material 150 and the second restraining material 170 are relatively displaced is small, and the first restraining material 150 and the second restraining material 170 are in contact with each other. 174 along the x direction (for example, along the x direction), and displacement in the direction perpendicular to the contact surface (y direction) and separation from each other are suppressed.

  With such a configuration, when a strong compressive force is applied to the brace core material 110 and the brace core material 110 tries to deform in a buckling direction (for example, the direction indicated by the arrow AR1 in FIG. 2), a relatively strong seat. A bending restraining force is applied from the first restraining material 150 or the second restraining material 170 to the brace core material 110. As a result, buckling of the brace core material 110 is suppressed.

  FIG. 4 is a cross-sectional view for explaining the deformation of the buckling restraint material (first restraint material 150a, second restraint material 170a) in the buckling restraint brace 100a according to the comparative example of the present invention. The buckling restraint brace 100a joins the welding portion when joining the first restraint material 150a and the second restraint material 170a, and the flat plate portion 151a and the projecting portions 161a and 165a of the first restraint material 150a. Only the welded portion is different from the buckling restrained brace 100, and the other configuration is the same as that of the buckling restrained brace 100. In FIG. 4, illustration of the cross section of the brace core material 110a is omitted.

  As shown in FIG. 4A, in the buckling restrained brace 100a, the protruding portion 161a and the second restraining material 170a are welded and joined only at the outer edge on the left side in FIG. 4A of the contact surface 173a. (Denoted by reference numeral BD5). Regarding the other part of the contact surface 173a, the protrusion 161a and the second restraining material 170a are only in contact with each other, and are not integrated. The same applies to the welding joint between the protruding portion 165a and the second restraining material 170a, and the protruding portion 165a and the second restraining material 170a are welded only at the outer edge on the right side in FIG. 4A of the contact surface 174a. They are joined (indicated by reference numeral BD6).

  Further, in the buckling restrained brace 100a, the protruding portion 161a and the flat plate portion 151a are welded and joined only on the left outer edge in FIG. 4A of the lower end surface 163a of the protruding portion 161a (indicated by reference numeral BD7). ) For the other parts of the lower end surface 163a, the projecting portion 161a and the flat plate portion 151a are only in contact with each other, and are not integrated. The same applies to the welding joint with the protruding portion 165a flat plate portion 151a, and the protruding portion 165a and the flat plate portion 151a are welded and joined only at the outer edge on the right side in FIG. Indicated by BD8).

  When a compressive force in the direction along the longitudinal direction is applied to the brace core material 110a, the shaft portion 111a of the brace core material 110a is deformed by the compressive force. Specifically, the shaft portion 111a of the brace core material 110a having a thin plate shape is deformed so that a part thereof is displaced along the thickness direction. Due to the deformation, a part of the brace core material 110a hits the surface 152a of the flat plate portion 151a and slightly deforms the flat plate portion 151. Further, the other part of the brace core material 110a hits the surface 172 of the second restraint material 170a and slightly deforms the second restraint material 170a.

  FIG. 4B shows these modifications exaggerated for convenience of explanation. As shown in FIG. 4B, the second constraining material 170a is curved so as to be convex upward by receiving the upward force in FIG. 4B at the central portion along the x direction. It becomes a shape. The second restraining material 170a is only on the left outer edge (BD5) in FIG. 4B of the contact surface 173a and only on the right outer edge (BD6) of FIG. 4B on the contact surface 174a. The first constraining material 150a is welded. For this reason, the force that restrains the deformation of the second restraining material 170a is relatively weak, and the buckling restraining brace can be easily understood from the fact that the contact surface 173a and the upper end surface 162a are spaced apart. Compared to the case of 100, the deformation of the second restraining material 170a is larger.

  Further, depending on how the brace core material 110a to which the compressive force is applied is deformed, the contact surface 173a and the upper end surface 162a are not separated from each other, but the second restraining material 170a slides along the contact surface 173a. In this way, the entire buckling restrained brace 100a may be deformed. Also in this case, the force that restrains the deformation of the second restraining material 170a is relatively low because the majority of the abutting surface 174a and the upper end surface 162a are in contact with each other and are not integrated. weak. As a result, as compared with the case of the buckling restraint brace 100, the deformation of the second restraint material 170a is also increased.

  On the other hand, in the buckling restraint brace 100 shown in FIG. 3 and the like, the first restraint member 150 and the second restraint member 170 have contact surfaces 173 and 174 in which a part of each surface is brought into contact with each other. Among these, the contact surfaces 173 and 174 are welded to each other at a portion closer to the center than the outer edges. For this reason, the second constraining material 170 is deformed so that the contact surface 173 and the upper end surface 162 are separated from each other, or the buckling constraining brace so that the second constraining material 170 slides along the contact surface 173. It is possible to prevent the entire 100a from being deformed. As a result, a relatively strong buckling restraining force is applied from the first restraining material 150 or the second restraining material 170 to the brace core material 110, thereby suppressing the buckling of the brace core material 110.

  Further, in the buckling restraint brace 100, the contact surface 173 where the first restraint material 150 and the second restraint material 170 are in contact with each other is the surface of the brace core material 110 that is closest to the contact surface 173 ( It is perpendicular to the facet 112) shown in FIG. Further, the contact surface 174 is perpendicular to the surface of the brace core material 110 closest to the contact surface 174 (the fore edge surface 113 shown in FIG. 3).

  In such a configuration, when the first constraining material 150 and the second constraining material 170 are welded together, the gas injection direction substantially coincides with the y direction, so that the welding heat is mainly transmitted. Is not a direction toward the fore edge surfaces 112 and 113 of the brace core material, but a direction substantially parallel to the fore edge surfaces 112 and 113 (y direction). As a result, since the inflow of welding heat to the brace core material 110 is suppressed, the temperature of the brace core material 110 does not increase excessively.

  Since the cross section cut along the longitudinal direction (z direction) of the brace core material 110 has a rectangular shape, the entire buckling restraint brace 100 has a small dimension along the y direction. In the present embodiment, when viewed along the y direction, the contact surfaces 173 and 174 that are welded portions of the first restraining material 150 and the second restraining material 170 are not positioned so as to overlap with the brace core material 110. Has been placed. For this reason, the thickness (dimension along the y direction) of the buckling restraint brace 100 is not increased by arranging the welded portions, and the entire buckling restraint brace 100 is thinned.

  In the present embodiment, the protrusions 161 and 165 are formed only on the first restraint material 150, and the respective upper end surfaces 162 and 166 and the second restraint material 170 are welded and joined. However, as an embodiment of the present invention, Is not limited to such a mode. For example, a protrusion is formed on the second restraint material 170, and the tip of the protrusion 161 (165) of the first restraint 150 and the tip of the protrusion of the second restraint 170 are abutted with each other. May be welded together. However, in this case, since the welding location is a deep position along the y direction, the present embodiment is preferable in view of the workability of welding. Moreover, the cross-sectional shape of the brace core material 110 is not limited to a rectangle, and may be a circle.

  The first constraining material 150 and the second constraining material 170 are welded in such a manner that the inside of the circular through hole 175 or the like is filled with a weld metal, but the shape of the through hole 175 or the like may be a groove shape instead of a circular shape. That is, the first constraining material 150 and the second constraining material 170 may be welded together by groove welding instead of plug welding. Further, welding joining may be performed by fillet hole welding or fillet groove welding.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

100, 100a: Buckling restraint brace 110, 110a: Brace core material 111, 111a: Shaft portion 112, 113: Small face 120, 130: Flange portion 121, 131: Through hole 150, 150a: First restraint material 151, 151a: Flat plate portion 152, 152a: surface 153, 153a, 154, 154a: contact surface 155, 157: through-hole 161, 161a, 165, 165a: protrusion 162, 162a, 166, 166a: upper end surface 163, 163a, 167, 167a: lower end surface 170, 170a: second restraint material 172, 172a: surface 173, 173a, 174, 174a: contact surface 175, 177: through hole 200: pillar 210: through hole 300: beam 310, 320: flange 330 : Web 340: Fixed flange 341: Through hole BT1, BT2 , BT3: Bolt

Claims (6)

A brace core whose ends are connected to columns or beams, respectively;
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 is
Having a first restraining material and a second restraining material,
With the brace core material sandwiched between the first restraint material and the second restraint material, the first restraint material and the second restraint material are welded together,
The first constraining material and the second constraining material are welded to each other at a portion closer to the center than the outer edge of the abutting surface among the abutting surfaces in which a part of each surface abuts each other. A buckling-restrained brace characterized by The contact surface is
The buckling restraint brace according to claim 1, wherein the brace core material is perpendicular to a surface closest to the contact surface. Of the brace core material, the portions other than both ends connected to the pillar or beam are thin plates whose cross-sectional shape perpendicular to the longitudinal direction is a rectangle,
The contact surface is
The buckling restrained brace according to claim 2, wherein the brace-restraining brace is disposed at a position outside the brace core material in a direction along the long side of the rectangle.   The first restraint member is formed with a protrusion that protrudes toward the second restraint member, and the contact surface is formed at a tip of the protrusion. The buckling restraint brace described in 1.   The first constraining member has a flat surface partly opposed to the brace core material, and the protruding portion welds a plate-like body to a portion of the flat surface that does not face the brace core material. The buckling-restraining brace according to claim 4, wherein the buckling-restraining brace is formed by bonding.   6. The first restraint material and the second restraint material are welded to each other by any one of plug welding, groove welding, fillet hole welding, and fillet groove welding. The buckling restrained brace according to any one of the above.

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