JP6184691B2 - Buckling restraint brace - Google Patents

Description

  The present invention relates to a buckling-restrained brace that is incorporated in a framework of a structure and absorbs vibration energy and attenuates vibration in the event of an earthquake or the like.

  Various buckling-restraining braces have been proposed and put to practical use, such as those in which the periphery of the core material is stiffened with only steel plates, those stiffened with RC, and those stiffened with steel and mortar. Has been. As a type of stiffening with a steel material and mortar, there is a type consisting of a grooved steel material having an opening on the core side and mortar or concrete filled in the grooved steel material (for example, Patent Document 1). This is one of the advantages that the thickness of the constraining material can be reduced according to the required performance. Both ends of the core material are joint plate portions joined to the building frame, and plate-like ribs protruding on both surfaces are provided along the longitudinal direction.

JP 2009-249833 A Japanese Patent No. 4975062

  As described above, the buckling restraint brace in which the restraint material as shown in Patent Document 1 is formed of a channel steel and mortar is one of the advantages that the restraint material thickness can be reduced according to the required performance. In order to reduce the thickness of the restraining material, the height of the rib provided on the joint plate at both ends of the core material is also lowered. However, when this conventional buckling-restrained brace is installed vertically, that is, with the installation method in which the core weak axis faces in the out-of-plane direction, the low rib height reduces rigidity against out-of-plane deformation. It has been found that this is a cause. In particular, the rigidity of the portion of the rib located at the end of the restraint material greatly affects the lack of rigidity against the out-of-plane deformation of the buckling restraint brace.

  An object of the present invention is to provide a buckling-restrained brace that is excellent in rigidity against out-of-plane deformation when installed with an installation method in which the core material weak axis faces in the out-of-plane direction and that can reduce the thickness of the constraining material according to the required performance. Is to provide.

The buckling restrained brace of the present invention has a core material and a pair of restraint materials arranged along both surfaces of the core material, and the pair of restraint materials are channel steel materials each having an opening on the core material side, and In the buckling restrained brace made of mortar or concrete filled in the channel steel,
A pair of joint plates portion joined to the skeleton of the building extending longitudinally from opposite ends of the constraining material in the core material, a plate-like rib which projects on both sides facing the core material weak axis direction in the longitudinal direction along it provided,
The height of the rib is rather higher than the restraining member, the over both ends of the constraining material and the mortar or concrete and interposition steel provided with ribs insertion slot, the longitudinal direction of the ribs in the rib insertion slit partially protrude from the inserted said channel-shaped surface of the steel,
The shape of the end portion on the center side in the longitudinal direction of the core of the double-sided ribs is a taper shape in which the height from the joint plate portion gradually decreases toward the center side, and the ribs on both sides are V-shaped. And the shape of the end of the rib insertion slit on the center side in the longitudinal direction of the core material is a V-shape similar to the shape of the end of the rib .

  According to this configuration, the height of the rib provided on the joint plate at both ends of the restraint material is made higher than that of the restraint material, and the rib insertion slit extending over the grooved steel material is provided at the end of the restraint material. The ribs have a length that allows a part of the ribs to enter the restraining material. Therefore, the rigidity of the ribs on both sides of the joint plate part of the core material is high near the ends of the restraint material, and the buckling has excellent rigidity against out-of-plane deformation when installed with the core material weak axis facing the out-of-plane direction. It becomes a restraint brace. In addition, the rib insertion slit is provided in the constraining material so as to insert the increased rib, so that the constraining material thickness can be reduced, which is an advantage of the buckling constraining brace made of channel steel and mortar or concrete. The rigidity against out-of-plane deformation can be improved without impairing the advantage.

  In this invention, you may provide the metal block for ribs which covers the surface of this mortar or concrete in the part of the said mortar or concrete in the said rib insertion slit of the said restraint material. When the rib guard is provided as described above, it is possible to prevent the mortar or concrete from being peeled off due to the sliding contact with the rib at the rib insertion slit. Therefore, even if it is a structure which inserts the said rib by providing a rib insertion slit over a channel steel material from mortar or concrete, a trouble does not arise.

  In the buckling restrained brace of the present invention, a flange plate may be welded to the tip of the rib along the longitudinal direction. By thus welding the flange plate to the rib, the bending rigidity can be effectively increased. Therefore, even if the bending rigidity is insufficient only by increasing the rib height, the necessary rigidity can be ensured.

In the buckling-restrained brace of the present invention, a splice plate that is provided on the housing of the building and that is overlapped over a surface of the rib and a brace joint hardware that the end face of the rib and the joint plate portion of the core material are abutted with each other. One end of the splice plate may be provided so as to overlap with the restraining material in the longitudinal direction.
In this way, when the splice plate is provided so as to extend to a position overlapping with the restraining material in the longitudinal direction, the joint plate portion and the rib of the core material can be shortened while ensuring the length necessary for joining with the splice plate. Moreover, the buckling stiffening effect by the splice plate can be expected.

The buckling restrained brace of the present invention has a core material and a pair of restraint materials arranged along both surfaces of the core material, and the pair of restraint materials are channel steel materials each having an opening on the core material side, and In the buckling restraint brace made of mortar or concrete filled in the channel steel material, a pair of joint plate portions extending in the longitudinal direction from both ends of the restraint material in the core material and joined to the building frame , provided plate-shaped ribs projecting on both sides facing the core material weak axis direction along the longitudinal direction, the height of the ribs rather higher than the restraining member, said mortar or concrete on both ends of the restraining member and across the interposition steel provided with ribs insertion slot, the rib insertion slit of said ribs said longitudinal part is inserted to protrude from the surface of the groove-shaped steel core material longitudinal of the both surfaces of the ribs End in the direction center The shape is a tapered shape in which the height from the joint plate portion gradually decreases toward the center side, and the ribs on both sides form a V-shaped end shape, and the rib insertion slit core material Since the shape of the end portion on the center side in the longitudinal direction is a V shape similar to the shape of the end portion of the rib, against the out-of-plane deformation when the core material weak axis is installed by the installation method facing the out-of-plane direction. It has excellent rigidity and can reduce the thickness of the constraining material according to the required performance.

It is a perspective view of the buckling restraint brace concerning one Embodiment of this invention. (A) is a plan view showing an end of the buckling restrained brace, (B) is a cross-sectional view taken along the line IIA-IIA in FIG. (A), and (C) is an enlarged cross-sectional view taken along the line IIB-IIB in FIG. FIG. It is a disassembled perspective view of the buckling restraint brace. (A) is a top view which shows the edge part of the buckling restraint brace which concerns on other embodiment of this invention, (B) is the IVA-IVA sectional view taken on the line (A), (C) is the figure (A) 4 is an enlarged cross-sectional view taken along line IVB-IBB. (A) is a top view which shows the edge part of the buckling restraint brace which concerns on other embodiment of this invention, (B) is the VA-VA sectional view taken on the line of the same figure (A), (C) is the figure ( It is a VB-VB line expanded sectional view of A).

  A first embodiment of the present invention will be described with reference to FIGS. The buckling restraint brace 1 includes a core member 2 and a pair of restraint members 3 disposed along both surfaces of the core member 2. The core material 2 is a strip-shaped elongated flat steel plate, and is made of a steel material having a low yield point, such as an SN material (rolled steel material for building structures) or an LY material (very low yield point steel material). An unbond material 8 shown in FIG. 3 is attached to the surface of the core material 2 facing the restraint material 3. The unbond material 8 is made of a plate-like or sheet-like butyl rubber, another viscoelastic body, or the like. The unbond material 8 is not necessarily provided and is not shown in other drawings.

  The pair of restraining members 3 include a grooved steel material 4 having an opening on the core material 2 side and a mortar 5 filled in the grooved steel material 4 as shown in a cross section in FIG. Concrete may be filled instead of the mortar 5. The grooved steel material 4 is a bent product obtained by bending a steel plate into a grooved cross section in which both flanges 4b rising vertically from both ends of the web 4a are unequal sides. Of the two flanges 4b, at the position corresponding to the height at which the core material 2 is disposed on the inner surface of one flange 4b having a longer width, the core material 2 extends in the width direction by extending in the length direction of the channel steel material 4. A bar-shaped spacer 7 is fixed by welding or the like. The flange 4b having the longer width dimension is placed on the outer surface of the flange 4b having the shorter width dimension in the channel steel material 4 of the other restraining material 3, and the covered parts are joined to each other by welding or the like.

  As shown in FIG. 1, both end portions of the core material 2 extend from both ends of the restraint material 3, and become joint plate portions 2 </ b> A that are joined to a steel frame material such as a column or a beam. In the joint plate portion 2A, ribs 6 made of a flat steel material project along the longitudinal direction from the center in the width direction of both surfaces, and the joint plate portion 2A and the rib 6 form a cross-shaped joint portion in cross section. It is composed. The rib 6 is joined to the joint plate portion 2A by welding. The joint plate 2A and the rib 6 are provided with a plurality of bolt holes 9 and 10, respectively.

  The rib 6 has a height H (FIG. 2 (B)) higher than the height D in the overlapping direction of the restraining material 3 and extends across the mortar 5 and the channel steel 4 at both ends of the restraining material 3. The rib insertion slit 11 is provided, and a part of the rib 6 in the longitudinal direction is inserted into the rib insertion slit 11 so as to protrude from the surface of the channel steel material 4. In the illustrated example, the rib 6 is formed to have a stepped height in which a lower portion on the center side of the core member 2 and a higher portion on the end portion side are connected via an inclined portion. The height H is the height of the portion located on the end face of the restraint material 3, and in this example, is the height of the low portion. The edge of the rib 6 at the center side end is an inclined side.

  In the portion of the mortar 5 in the rib insertion slit 11 of the restraining material 3, a rib guard 12 that covers the surface of the mortar 5 is provided. As shown in FIG. 3, the rib guard 12 has portions 12 a and 12 b that cover both side surfaces and end surfaces in the rib insertion slit 11, and a portion 12 c that covers the end surface of the restraining material 3. The end portion of the web 4 a of the grooved steel material 4 in the restraining material 3 is cut out along the rib guard 12, and the cutout portion becomes a grooved steel material portion in the rib insertion slit 11.

  In the buckling restrained brace 1 having this configuration, both end surfaces of the core member 2 are joined to a brace joint hardware such as a gusset plate joined to a column or beam of a building. For example, as shown in FIG. 4A, splice plates 16 and 17 are abutted against the end face of the brace joint metal 13 having a cross-shaped cross section, and the splice plates 16 and 17 are formed on both surfaces from the joint plate portion 2A and the rib 6 to the brace joint metal 13, respectively. Overlaid. The splice plates 16 and 17 are used to join the brace fitting 13 with bolts. This bolt joining is performed by bolts and nuts (not shown) inserted through the bolt holes 9 and 10.

  According to the buckling restraint brace 1 having the above configuration, the height H of the rib 6 provided on the joint plate portion 2A at both ends of the restraint material is made higher than the height D of the restraint material 3 and the groove shape is formed at the end of the restraint material 3. By providing the rib insertion slit 11 extending over the steel material 4, the heightened rib 6 is provided up to a length where a part of the rib 6 overlaps the restraining material 3. Therefore, the rigidity in the vicinity of the restraint material ends in the ribs 6 on both surfaces of the joint plate portion 2A of the core material 2 is increased. Thereby, when it installs in a building by the installation method in which a core material weak axis (plate thickness direction) faces an out-of-plane direction, it becomes the buckling restraint brace 1 excellent in the rigidity with respect to an out-of-plane deformation. Further, since the rib insertion slit 11 is provided in the constraining material 3 so as to insert the raised rib 6, the constraining material thickness which is an advantage of the buckling constraining brace in which the constraining material 3 is the grooved steel material 4 and the mortar 5. The rigidity against out-of-plane deformation can be improved without impairing the advantage that the thickness can be reduced.

  In addition, since the mortar 5 in the rib insertion slit 11 of the restraint material 3 is provided with a rib metal 12 that covers the surface of the mortar 5, the mortar 5 is connected to the rib 6 in the rib insertion slit 11. It is prevented that peeling or the like occurs due to the sliding contact. Further, since the rib guard 12 is provided, the strength reduction of the channel steel material 4 due to the formation of the rib insertion slit 11 can be compensated. Therefore, even if the rib insertion slit 11 is provided from the mortar 5 to the grooved steel material 4 and the rib 6 is inserted, the mortar 5 is not peeled off and the strength of the grooved steel material 4 is not hindered.

  FIG. 4 shows another embodiment of the present invention. The buckling restrained brace 1 of this embodiment is obtained by welding a flange plate 15 along the longitudinal direction to the tip of the rib 6 in the first embodiment shown in FIGS. The flange plate 15 is provided at each portion of the rib 6 where the height is different.

  When the flange plate 15 is welded to the rib 6 in this way, the bending rigidity can be effectively increased. Therefore, even if the bending rigidity is insufficient only by increasing the height of the rib 6, the necessary rigidity can be ensured. Other configurations and effects in this embodiment are the same as those in the first embodiment.

FIG. 5 shows still another embodiment of the present invention. In this embodiment, the splice plate 17 overlapped on both surfaces of the rib 6 is set to a position where one end overlaps the restraining material 3 in the longitudinal direction. That is, an overlapping range a is provided.
In this way, when the splice plate 17 is provided so as to extend to a position overlapping with the restraining material 3 in the longitudinal direction, the joint plate portion 2A and the rib 6 of the core material 2 are shortened while ensuring the necessary joining length by the splice plate 17. it can. Specifically, compared to the first embodiment shown in FIG. 2, the joint plate portion 2 </ b> A and the rib 6 can be shortened by a dimension L (FIG. 5) in which the splice plate 17 approaches the restraint material 3 side. Moreover, the buckling stiffening effect by the splice plate 17 can be expected. Other configurations and effects in this embodiment are the same as those in the first embodiment.

DESCRIPTION OF SYMBOLS 1 ... Buckling restraint brace 2 ... Core material 2A ... Joint board part 3 ... Restraint material 4 ... Channel steel 5 ... Mortar (or concrete)
6 ... Rib 11 ... Slit 12 ... Rib shield 13 ... Brace joint 15 ... Flange plate 17 ... Splice plate

Claims (4)

A core material and a pair of constraining materials arranged along both sides of the core material, and the pair of constraining materials are each filled with a grooved steel material having an opening on the core material side. In buckling restrained braces made of mortar or concrete,
A pair of joint plates portion joined to the skeleton of the building extending longitudinally from opposite ends of the constraining material in the core material, a plate-like rib which projects on both sides facing the core material weak axis direction in the longitudinal direction along it provided,
The height of the rib is rather higher than the restraining member, the over both ends of the constraining material and the mortar or concrete and interposition steel provided with ribs insertion slot, the longitudinal direction of the ribs in the rib insertion slit partially protrude from the inserted said channel-shaped surface of the steel,
The shape of the end portion on the center side in the longitudinal direction of the core of the double-sided ribs is a taper shape in which the height from the joint plate portion gradually decreases toward the center side, and the ribs on both sides are V-shaped. A buckling-restraining brace characterized in that the shape of the end of the rib insertion slit on the center side in the longitudinal direction of the core is a V-shape similar to the shape of the end of the rib. .   The buckling constraining brace according to claim 1, wherein a rib guard covering the surface of the mortar or concrete is provided in a portion of the mortar or concrete in the rib insertion slit of the constraining material.   The buckling restraint brace according to claim 1 or 2, wherein a flange plate is welded to the tip of the rib along the longitudinal direction.   The buckling restrained brace according to claim 1 or 2, wherein a brace joint metal provided on the housing of the building and in which the joint plate portion of the core member and the end face of the rib are abutted and a surface of the rib. A buckling constraining brace provided with a splice plate that is overlapped over and having one end of the splice plate overlapped with the constraining material in the longitudinal direction.

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