JP2018084103A - Buckling restrained brace and earthquake resistant frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buckling restrained brace and an earthquake resistant frame which can be reduced in weight.SOLUTION: A buckling restrained brace 100 according to the present invention is a buckling restrained brace 100 comprising a core member 10 having flat steel and two restraint members 20 extending along the longitudinal direction of the core member 10 and sandwiching the core member 10. One of the restraint members of the two restraint members 20 is a channel steel 23 or an H shape steel 27, the other restraint member is a T shape steel 21, the core member 10 is sandwiched between a web 23a (27a) of one restraint member and a flange 21a of another restraint member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a buckling restrained brace and a seismic frame using the same.

  The buckling-restrained brace is incorporated as a structural member in the skeleton of a building structure, and plays a role of absorbing energy generated by external force in the skeleton when an earthquake occurs. The buckling-restraining brace is formed along the core material in order to prevent the core material formed of a steel material that expands and contracts by receiving a tensile load and a compressive load in the longitudinal direction and the core material that receives the compressive load from buckling. And a restraining material to be arranged.

  For example, Patent Document 1 discloses a vibration-damping steel frame structure in which a steel material is used as a core material, and a steel pipe and a filling mortar are used as a restraining material, and the space between the core material and the filling mortar is unbonded. .

JP 2001-227192 A

  However, in the vibration-damping steel structure of Patent Document 1, since the steel pipe is filled with mortar to form a restraint material, there is a problem that the weight of the mortar is large and the weight of the entire buckling restraint brace is large. there were.

  An object of the present invention made in view of such a point is to provide a buckling restrained brace and an earthquake-resistant frame that can be reduced in weight.

In order to solve the above problems, a buckling restrained brace according to the present invention is
A core material having flat steel;
A buckling restraint brace that extends along the longitudinal direction of the core material and includes two restraint materials that sandwich the core material,
One restraint material of the two restraint materials is channel steel or H-section steel,
The other restraint material of the two restraint materials is a T-section steel,
The core member is sandwiched between a web of the one restraint member and a flange of the other restraint member.

In the buckling restraint brace according to the present invention, second restraint members are disposed on both sides of the core member in a direction perpendicular to the longitudinal direction of the core member and along the web, and the second restraint member is the core restraint. Sandwiched by the one restraint material and the other restraint material together with the material,
The thickness of the second restraining material in the direction orthogonal to the flange may be larger than the thickness of the core material.

  In the buckling restrained brace according to the present invention, at least a part of the core material may be surrounded by a thin steel plate.

  In addition, the buckling restrained brace according to the present invention includes at least one of the core material, the one restraint material, the other restraint material, and the second restraint material, wherein at least a part thereof is an anti-friction material. May be covered with rusting agent.

  In the buckling restraint brace according to the present invention, the one restraint member and the other restraint member may be connected by an engaging member.

  Moreover, the buckling restraint brace which concerns on this invention may further have the bundle material extended orthogonally to the said longitudinal direction.

  Moreover, in order to solve the said subject, the seismic frame which concerns on this invention uses said buckling restraint brace.

The seismic frame according to the present invention has two columns and a beam connecting the upper portions of the two columns.
In some cases, the two buckling-restraining braces are inclined and fixed in a C shape from the lower ends of the two columns toward the center of the beam.

  ADVANTAGE OF THE INVENTION According to this invention, the buckling restraint brace and seismic frame which can be reduced in weight can be provided.

It is a front view of the earthquake-resistant frame concerning a 1st embodiment of the present invention. It is sectional drawing of the buckling restraint brace which concerns on 1st Embodiment of this invention by the AA cross section of FIG. It is a modification of the buckling restraint brace which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure of the buckling restraint brace which concerns on 1st Embodiment of this invention. It is sectional drawing of the buckling restraint brace which concerns on 1st Embodiment of this invention by the BB cross section of FIG. It is sectional drawing in the same position as FIG. 2 which shows the buckling restraint brace which concerns on 2nd Embodiment of this invention. It is sectional drawing in the same position as FIG. 2 which shows the buckling restraint brace which concerns on 3rd Embodiment of this invention.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a front view showing the configuration of the seismic frame 150 according to the first embodiment of the present invention. In this embodiment, the seismic frame 150 uses the buckling restrained brace 100 according to the first embodiment of the present invention, but is not limited to this, and uses a buckling restrained brace according to another embodiment described later. May be. As shown in FIG. 1, the seismic frame 150 according to the present embodiment includes at least two pillars 120 that extend in the vertical direction and support the load on the roof and the second floor, and the upper part of the two pillars 120 that extend in the horizontal direction. The two buckling-restraining braces 100 are fixedly inclined in a “C” shape from the lower ends of the two columns 120 toward the substantially central portion of the beam 110. Yes. As shown also in FIG. 4, a clevis-type attachment plate 62 projects from the lower end portion of the buckling-restraining brace 100 in the longitudinal direction, and is fastened to the gusset plate 122 welded to the column 120 side. 64 is fixed. Further, the clevis type attachment plate 62 provided at the upper end portion of the buckling restraint brace 100 is fixed to the gusset plate 112 welded to the substantially central portion of the beam 110 with the fastening bolt 64.

  As shown in FIGS. 1 and 4, the buckling restrained brace 100 includes a bundle member 102 extending in a direction orthogonal to the longitudinal direction. One end of the bundle member 102 is fixed to a restraining member 20 that surrounds the core member 10, and the other end is fixed to a plate 114 that connects the column 120 and the beam 110. As will be described later, the bundle material 102 plays a role of supporting the buckling restraint brace 100 at the center so as not to be deformed in a direction perpendicular to the longitudinal direction.

  FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and is a cross-sectional view of the buckling restrained brace 100 according to the first embodiment of the present invention. In the description of the cross section of the buckling restrained brace 100, the vertical direction and the horizontal direction in FIG. 2 will be described as the vertical direction and the horizontal direction, respectively. The same applies to other embodiments. As shown in FIG. 2, the buckling-restraining brace 100 of the present embodiment includes a core material 10 having a flat steel, which receives a load in a direction perpendicular to the paper surface, an unbond material 15 surrounding the core material 10, and the core material 10. The restraint member 20 that sandwiches the restraint member 20 from above and below, the second restraint member 30 disposed on the left and right sides of the core member 10, and the fastening member 40 that fastens the restraint member 20 and the second restraint member 30 together.

  In the present embodiment, the core member 10 has a rectangular cross-sectional shape whose long side extends in the left-right direction, and a load acts in the longitudinal direction (direction perpendicular to the paper surface of FIG. 2). That is, the core material 10 is a flat steel that expands and contracts in the same direction when a tensile load and a compressive load in the longitudinal direction are applied. For example, when the beam 110 in FIG. 1 receives an external force due to an earthquake or the like and moves in the right direction in the figure with respect to the ground, a tensile load acts in the longitudinal direction of the buckling restrained brace 100 on the left side in the figure, A compressive load acts on the buckling restraint brace 100 on the right side. The buckling-restraining brace 100 absorbs energy caused by external force on the beam 110 while expanding and contracting in the longitudinal direction in response to these loads. In addition, although it is desirable to use the steel material for constructions whose yield ratio is defined and plastic deformation performance is clear, such as SN400B, for example, the material of the core material 10 is not necessarily limited to this.

  In the present embodiment, as shown in FIG. 2, the constraining material 20 includes a T-shaped steel 21 disposed above the core material 10, a channel steel 23 disposed below the core material 10, and a channel steel 23. And a second T-shaped steel 25 disposed further below the first T-shaped steel. The T-shaped steel 21 is disposed such that the web 21b protrudes upward, and the lower surface of the flange 21a is disposed so as to face the upper surface of the core member 10. Further, the channel steel 23 is disposed such that the flange 23 b protrudes upward, and the upper surface of the web 23 a is disposed so as to face the lower surface of the core member 10. Further, the second T-shaped steel 25 is disposed so that the web 25 b protrudes downward, and the upper surface of the flange 25 a is disposed so as to face the lower surface of the web 23 a of the channel steel 23. Each of these members constituting the restraint member 20 may be arranged symmetrically with respect to the center line in the left-right direction of the core member 10 as a reference.

  Although the T-shaped steel 21 has high rigidity with respect to the load in the vertical direction in FIG. 2, the rigidity is not necessarily sufficient with respect to the load in the horizontal direction in the figure. On the other hand, the channel steel 23 has high rigidity with respect to the load in the left-right direction in FIG. 2, but the rigidity is not necessarily sufficient with respect to the load in the up-down direction in FIG. Therefore, in this embodiment, by combining the T-shaped steel 21 and the grooved steel 23 having high rigidity in the directions orthogonal to each other, the direction of the top, bottom, left and right in FIG. High rigidity was obtained. Thereby, the buckling to the direction orthogonal to the longitudinal direction of the core material 10 can be suppressed.

  The T-shaped steels 21 and 25 constituting the present embodiment may be a roll material formed into a T shape by rolling or a built material formed into a T shape by welding a steel plate. .

  The two T-shaped steels 21 and 25 and the grooved steel 23 constituting the constraining material 20 have such a strength that does not cause buckling by sandwiching the core material 10 when a compressive load is applied to the core material 10. It is necessary to have. For example, a steel material for construction such as SS400 can be used as the restraining material 20, but the material is not limited to this.

  In the present embodiment, the unbond material 15 is formed of a thin steel plate, and is configured to cover four surfaces of the core material 10 as shown in FIG. That is, the core material 10 is surrounded by the thin steel plate. By interposing the unbond material 15 between the core material 10 and the restraint material 20 in this way, the core material 10 and the restraint material 20 can be slightly slid in the plane, and the friction between them is reduced. be able to. As the material of the unbond material 15, for example, an inexpensive Galvalume steel plate (registered trademark) having a thickness of 1.0 mm or less that is excellent in anticorrosion performance can be used, but the material and thickness are not necessarily limited thereto.

  Further, the method for obtaining the unbonded state is not limited to using the unbonded material 15 formed of a thin steel plate. For example, as shown in FIG. 3, which is a modification of the first embodiment, the unbonded material 15 is not used, and the friction of the core material 10, the restraint material 20 that contacts the core material 10, and the second restraint material 30 is reduced. Therefore, it may be configured to be in an unbonded state by being covered with a rust preventive agent 17. Here, the rust inhibitor 17 may cover the core material 10 and the like by applying a paint having a rust preventive effect. For example, in applications where high rust prevention performance is required, plating such as hot dip galvanization is performed. You may cover the core material 10 grade | etc., By giving. Further, the buckling restrained brace 100 may be configured not to use the unbond material 15 and the rust inhibitor 17.

  The second constraining material 30 is arranged on both sides of the core material 10 in a direction perpendicular to the longitudinal direction of the core material 10 and along the flange 21a and the web 23a, and the core material 10 moves excessively in the left-right direction in FIG. It is provided to suppress this. The second constraining material 30 is sandwiched between the grooved steel 23 and the T-shaped steel 21 together with the core material 10. The thickness of the second restraint member 30 in the direction perpendicular to the flange 21a and the web 23a (the vertical direction in FIG. 2) is set slightly larger than the thickness of the core member 10. Thus, the gap between the core material 10 and the restraint material 20 is managed to a predetermined value (for example, about 1 mm), and the unbond material 15 having a thickness slightly smaller than the gap is interposed, so that the core material 10 and the restraint material are interposed. Friction between 20 can be reduced. In addition, SS400 etc. can be used for the material of the 2nd restraint material 30, for example.

  In the present embodiment, the T-shaped steels 21 and 25 and the groove-shaped steel 23 and the second restraining material 30 that are the restraining material 20 are fastened together by a fastening member 40 (engaging member) including a fastening bolt 41 and a fastening nut 43. Has been. Here, the fastening bolt 41 and the fastening nut 43 are high-strength bolts and nuts made of a steel material having a high tensile strength, and are mainly used for bridges, steel buildings, structures, and the like. With the fastening bolt 41 and the fastening nut 43, the T-shaped steels 21 and 25, the channel steel 23, and the second restraining material 30 are firmly fixed to each other. When the core material 10 expands and contracts due to an earthquake or the like due to an earthquake or the like, the core material 10 is brought from an external force while slightly sliding with respect to the T-shaped steels 21 and 25 and the grooved steel 23 and the second restraining material 30. Absorb energy.

  FIG. 4 is a perspective view showing the configuration of the buckling restrained brace 100 according to the present embodiment. In FIG. 4, the T-shaped steel 21 (25) is configured to have a shorter length in the longitudinal direction than the core material 10, the channel steel 23, and the second restraining material 30. As shown in FIG. 4, the longitudinal end portion of the buckling restrained brace 100 includes a core material end connecting plate 50 that protrudes vertically from the upper surface and the lower surface of the core material 10, and an end portion of the core material 10. A constraining flat plate 60 constraining from above and below, and a clevis-type attachment plate 62 for fixing the buckling constraining brace 100 to the columns 120 and the gusset plates 122 and 112 on the beam 110 side are provided.

  The core material end connecting plate 50 is a member integrated with the core material 10 by welding or the like at the longitudinal end portion of the core material 10, and as shown in FIG. 5, with respect to the surface direction of the core material 10. It is a member extending in the vertical direction. The core end connecting plate 50 is sandwiched between two clevis-type attachment plates 62, and the clevis-type attachment plate 62 attaches the gusset plates 122, 112 fixed to the column 120 and the beam 110 by welding from both sides. By clamping (see FIGS. 1 and 4), the buckling restrained brace 100 can be fixed to the column 120 and the beam 110.

  As shown in FIGS. 1 and 4, the buckling restrained brace 100 has a bundle member 102 that extends in a direction perpendicular to the longitudinal direction at the center in the longitudinal direction. The bundle material 102 is connected to the buckling restrained brace 100 via a connecting plate 21c fixed to the web 21b of the T-shaped steel 21 by welding or the like. As shown in FIG. 2, the buckling restraint brace 100 of this embodiment does not use a filler such as mortar as a restraint material, and uses one of the restraint materials 20 that sandwich the core material 10 as the channel steel 23 and the other. The T-shaped steel 21 is used to reduce the weight of the constraining material 20 while ensuring the rigidity in the direction orthogonal to the longitudinal direction of the core material 10. However, in FIG. 2, even when the T-shaped steel 21 is used, the vertical rigidity of the restraint material 20 may not be sufficient. For this reason, in this embodiment, as shown in FIGS. 1 and 4, the bundle member 102 is provided in a direction perpendicular to the longitudinal direction of the core member 10 (direction indicated by a thick arrow in FIG. 1). Yes. Here, the direction indicated by the thick arrow in FIG. 1 is the vertical direction in FIG. And if the core material 10 tries to deform | transform in the direction shown by the thick line arrow of FIG. 1, the deformation | transformation of the core material 10 can be suppressed when the bundle material 102 receives a tensile load or a compressive load. Therefore, in the restraint material 20 composed of the channel steel 23 and the T-section steel 21 and reduced in weight, even when the vertical rigidity in FIG. 2 is not sufficient, the restraint material 20 and the bundle material 102 are combined to form a core. The buckling of the material 10 can be sufficiently suppressed.

  As shown in FIG. 1, the buckling-restraining brace 100 of this embodiment has one bundle member 102 at the center in the longitudinal direction, and the other end of the bundle member 102 is a column 120 and a beam 110. However, the present invention is not limited to this mode. One end of a plurality of bundle members 102 may be connected to a plurality of locations in the longitudinal direction of the buckling restrained brace 100, and the other end of these bundle members 102 may be connected to the column 120 or the beam 110, respectively. Further, the buckling restraint brace 100 may not include the bundle material 102.

  Moreover, in the buckling restraint brace 100 of this embodiment, although the bundle material 102 was comprised so that it might be connected with the T-section steel 21, it is not limited to this aspect. For example, you may comprise so that the bundle material 102 may be connected with the core material 10, the other restraint material 20, or the 2nd restraint material 30 grade | etc.,.

  Further, in the seismic frame 150 of the present embodiment, as shown in FIG. 1, the buckling-restrained brace 100 is configured to have a symmetrical “C” shape, but is not limited to this mode. For example, the buckling restrained brace 100 may be configured to have an “inverted C shape” shape, or may be configured to have a substantially C shape that is not symmetrical. Moreover, it is good also as arrangement | positioning which makes shapes other than a "C" shape.

  Further, in the buckling restrained brace 100 of the present embodiment, the T-shaped steels 21 and 25, the grooved steel 23, and the second restraining material 30 are firmly fixed by fastening with the fastening bolt 41 and the fastening nut 43. Although it comprised, it is not limited to this aspect. You may make it fix the said member by engaging members other than a volt | bolt and a nut. Moreover, you may fix between each member with the separate fastening member 40 irrespective of a joint fastening.

  Further, in the buckling restrained brace 100 of the present embodiment, the flange 23b of the channel steel 23 is configured to protrude upward in FIG. 2, but is not limited to this aspect, and protrudes downward. You may do it.

  Further, in the buckling restrained brace 100 of the present embodiment, the four surfaces of the core material 10 are covered with the unbonded material 15 such as a thin steel plate in the cross-sectional view of FIG. 2, but the present invention is not limited to this mode. You may comprise so that at least one part of the core material 10 may be covered with the unbond material 15. FIG.

  Moreover, in the modification of this embodiment shown in FIG. 3, by covering the core material 10, and the restraint material 20 and the 2nd restraint material 30 which contact | abut to the core material 10 with the rust preventive agent 17 for reducing friction. However, the present invention is not limited to this mode. You may comprise so that at least any member of the core material 10, the restraint material 20, and the 2nd restraint material 30 may be partially covered with the rust preventive agent 17 for making it into an unbonded state.

  As described above, in the present embodiment, the core material 10 having flat steel and the two restraining materials 20 that extend along the longitudinal direction of the core material 10 and sandwich the core material 10 are provided. One constraining member of the material 20 is a grooved steel 23, the other constraining material is a T-shaped steel 21, and the core material 10 is composed of the grooved steel 23 and the opposing flange 21 a and the web of the T-shaped steel 21. It was comprised so that it might be clamped by 23a. Thus, by using a general-purpose shape steel as the restraining material 20 without using a filler such as mortar or a steel material having a large mass, the buckling of the core material 10 is suppressed against the longitudinal load of the core material 10. The buckling restrained brace 100 which is possible, lightweight and inexpensive can be realized.

  Moreover, in this embodiment, the 2nd restraint material 30 is arrange | positioned on the both sides of the core material 10 in the direction orthogonal to the longitudinal direction of the core material 10 and along the flange 21a and the web 23a, and the said 2nd restraint material 30 is a core. The second constraining material 30 was sandwiched between the grooved steel 23 and the T-shaped steel 21 together with the material 10, and the thickness of the second restraining material 30 in the direction orthogonal to the flange 21 a and the web 23 a was configured to be larger than the thickness of the core material 10. Accordingly, the positional deviation of the core material 10 with respect to the restraint material 20 can be suppressed, and the gap between the core material 10 and the restraint material 20 can be maintained at an appropriate value to suppress wear of the core material 10 and the restraint material 20. it can.

  Moreover, in this embodiment, it comprised so that the core material 10 might be enclosed by the Galvalume steel plate (trademark) which is a thin steel plate. Thereby, the friction coefficient between the core material 10 and the restraint material 20 can be reduced.

  Moreover, in this embodiment, it comprised so that the surface of the core material 10, the channel steel 23, the T-shaped steel 21, and the 2nd restraint material 30 might be covered with the antirust agent 17 for friction reduction. Thereby, the friction coefficient between members can be reduced and the durability of the buckling restraint brace 100 can be improved.

  In the present embodiment, the grooved steel 23 and the T-shaped steel 21 are configured to be connected by the fastening bolt 41 and the fastening nut 43. Thus, when assembling the buckling restrained brace 100, it is possible to manufacture the buckling restraint brace 100 inexpensively and easily without a process that requires man-hours such as welding.

  In the present embodiment, the buckling restrained brace 100 is further configured to have a bundle member 102 orthogonal to the longitudinal direction thereof. Thereby, even when the restraining material 20 (channel steel 23) tries to deform in a direction with low rigidity, the bundle material 102 can suppress the deformation of the restraining material 20, and the buckling of the restraining material 20 can be restrained. .

  In the present embodiment, since the second T-shaped steel 25 is further disposed below the channel steel 23 in FIG. 2, the rigidity of the restraining material 20 in the vertical direction in FIG. 2 can be further increased. .

  Further, by using the buckling restrained brace 100 of the present embodiment, it is possible to realize a light and inexpensive seismic frame 150.

(Second Embodiment)
FIG. 6 is a cross-sectional view of a buckling restrained brace 200 according to the second embodiment of the present invention. The present embodiment is different from the first embodiment in that the second T-section steel 25 is not provided. Hereinafter, the same reference numerals are given to the same elements as those in the first embodiment, and the points different from the first embodiment will be mainly described. In the present embodiment, the restraint member 20 includes a T-section steel 21 disposed above the core material 10 and a channel steel 23 disposed below the core material 10 as illustrated in FIG. 6. The T-shaped steel 21 is disposed such that the web 21b protrudes upward, and the lower surface of the flange 21a is disposed so as to face the upper surface of the core member 10. Further, the channel steel 23 is disposed such that the flange 23 b protrudes upward, and the upper surface of the web 23 a is disposed so as to face the lower surface of the core member 10. Each of these members constituting the restraint member 20 may be arranged symmetrically with respect to the center line in the left-right direction of the core member 10 as a reference.

  In the present embodiment, the T-shaped steel 21 and the groove-shaped steel 23, which are the restraining material 20, and the second restraining material 30 are fastened together by a fastening member 40 (engaging member) including a fastening bolt 41 and a fastening nut 43. Yes.

  In the present embodiment, the flange 23b of the channel steel 23 is configured to protrude upward in FIG. 6, but is not limited to this aspect, and may protrude downward.

  Moreover, in this embodiment, the unbond material 15 is formed with a thin steel plate, and is comprised so that four surfaces of the core material 10 may be covered as shown in FIG. By interposing the unbond material 15 between the core material 10 and the restraint material 20 in this way, the core material 10 and the restraint material 20 can be slightly slid in the plane, and the friction between them can be reduced. it can. Instead of the unbonded material 15, the unbonded state may be realized by covering the core material 10 and the like with a rust preventive agent 17 for reducing friction.

  As described above, according to the present embodiment, as in the first embodiment, the core member 10 having flat steel and the two restraints that extend along the longitudinal direction of the core member 10 and sandwich the core member 10. And the other restraining material is a T-shaped steel 21, and the core material 10 is composed of the groove-shaped steel 23 and the T-shaped steel 23. It was comprised so that it might be clamped by the flange 21a and the web 23a which the steel 21 opposes. Thus, by using a general-purpose shape steel as the restraining material 20 without using a filler such as mortar or a steel material having a large mass, the buckling of the core material 10 is suppressed against the longitudinal load of the core material 10. The buckling restrained brace 200 that can be made light and inexpensive can be realized.

  In the present embodiment, although not shown, the buckling-restrained brace 200 can be configured to further include a bundle member 102 orthogonal to the longitudinal direction. As a result, even when the core material 10 tries to deform in a direction where the rigidity of the restraining material 20 (particularly the grooved steel 23) is low, the deformation of the core material 10 is suppressed by the bundle material 102 receiving a tensile load or a compressive load. In addition, buckling of the core material 10 can be suppressed.

  Although not shown in the drawings, the use of the buckling restrained brace 200 of the present embodiment makes it possible to realize a light and inexpensive seismic frame 150.

(Third embodiment)
FIG. 7 is a cross-sectional view of a buckling restrained brace 300 according to the third embodiment of the present invention. In addition, this embodiment differs from 2nd Embodiment by the point which has arrange | positioned the H-section steel 27 instead of the groove-shaped steel 23. FIG. Hereinafter, the same reference numerals are given to the same elements as those in the first and second embodiments, and the description will focus on differences from the first and second embodiments. In the present embodiment, as shown in FIG. 7, the restraint member 20 has a T-section steel 21 disposed above the core member 10 and an H-section steel 27 disposed below the core member 10. The T-shaped steel 21 is disposed such that the web 21b protrudes upward, and the lower surface of the flange 21a is disposed so as to face the upper surface of the core member 10. Further, the H-shaped steel 27 is disposed such that the flange 27 b protrudes vertically, and the upper surface of the web 27 a is disposed so as to face the lower surface of the core member 10. Each of these members constituting the restraint member 20 may be arranged symmetrically with respect to the center line in the left-right direction of the core member 10 as a reference.

  In this embodiment, the T-shaped steel 21 and the H-shaped steel 27, which are the restraining material 20, and the second restraining material 30 are fastened together by a fastening member 40 (engaging member) including a fastening bolt 41 and a fastening nut 43. Yes.

  Moreover, in this embodiment, the unbond material 15 is formed with a thin steel plate, and is comprised so that the four surfaces of the core material 10 may be covered as shown in FIG. By interposing the unbond material 15 between the core material 10 and the restraint material 20 in this way, the core material 10 and the restraint material 20 can be slightly slid in the plane, and the friction between them can be reduced. it can. Instead of the unbonded material 15, the unbonded state may be realized by covering the core material 10 and the like with a rust preventive agent 17 for reducing friction.

  As described above, according to the present embodiment, the core member 10 having flat steel and the two restraining members 20 that extend along the longitudinal direction of the core member 10 and sandwich the core member 10 are provided. One constraining material 20 is an H-shaped steel 27, the other constraining material is a T-shaped steel 21, and the core material 10 includes flanges 21 a that face the H-shaped steel 27 and the T-shaped steel 21, and It was comprised so that it might be clamped by the web 27a. Thus, by using a general-purpose shape steel as the restraining material 20 without using a filler such as mortar or a steel material having a large mass, the buckling of the core material 10 is suppressed against the longitudinal load of the core material 10. The buckling restrained brace 300 that can be made light and inexpensive can be realized.

  In the present embodiment, although not shown, the buckling-restrained brace 300 can be configured to further include a bundle member 102 that is orthogonal to the longitudinal direction. As a result, even when the core material 10 is about to deform in a direction where the rigidity of the restraining material 20 (particularly, the H-shaped steel 27) is low, deformation of the core material 10 is suppressed by the bundle material 102 receiving a tensile load or a compressive load. In addition, buckling of the core material 10 can be suppressed.

  Although not shown in the drawings, the use of the buckling restrained brace 300 according to the present embodiment makes it possible to realize a light and inexpensive seismic frame 150.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various changes or modifications based on the present disclosure. Therefore, it should be noted that these variations or modifications are included in the scope of the present invention. For example, functions included in each component can be rearranged so as not to be logically contradictory, and a plurality of components can be combined into one or divided.

10 Core material 15 Unbonded material 17 Rust preventive agent 20 Restraint material 21 T-shaped steel (another restraint material)
21a flange 21b web 21c connecting plate 23 channel steel (one restraint material)
23a web 23b flange 25 T-section steel 25a flange 25b web 27 H-section steel (one restraint material)
27a Web 27b Flange 30 Second restraint material 40 Fastening member (engaging member)
41 Fastening bolt 43 Fastening nut 50 Core material end connecting plate 60 Restraining flat plate 62 Clevis type attachment plate 64 Fastening bolt 100, 200, 300 Buckling restraining brace 102 Bundling material 110 Beam 112 Gusset plate 114 Plate 120 Column 122 Gusset plate 150 Seismic frame

Claims (8)

A core material having flat steel;
A buckling restraint brace that extends along the longitudinal direction of the core material and includes two restraint materials that sandwich the core material,
One restraint material of the two restraint materials is channel steel or H-section steel,
The other restraint material of the two restraint materials is a T-section steel,
The buckling-restraining brace, wherein the core material is sandwiched between a web of the one restraining material and a flange of the other restraining material. Second constraining materials are disposed on both sides of the core material in a direction perpendicular to the longitudinal direction of the core material and along the web, and the second constraining material and the one constraining material and the other one are arranged together with the core material. Sandwiched between
The buckling-restraining brace according to claim 1, wherein a thickness of the second restraining material in a direction orthogonal to the flange is larger than a thickness of the core material.   The buckling restrained brace according to claim 1 or 2, wherein at least a part of the core material is surrounded by a thin steel plate.   The at least one of the core material, the one restraint material, the other one restraint material and the second restraint material is at least partially covered with a friction reducing rust inhibitor. The buckling restraint brace described.   The buckling restraint brace according to any one of claims 1 to 4, wherein the one restraint member and the other restraint member are connected by an engagement member.   The buckling restrained brace according to any one of claims 1 to 5, further comprising a bundle member extending perpendicularly to the longitudinal direction.   An earthquake-resistant frame using the buckling-restrained brace according to any one of claims 1 to 6. Two pillars and a beam connecting the tops of the two pillars;
The seismic frame according to claim 7, wherein the two buckling-restraining braces are fixed in a C-shape inclined from the lower ends of the two columns toward the center of the beam.

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