JP6545502B2 - Buckling restraint brace - Google Patents

Description

  The present invention relates to a buckling restrained brace which is incorporated into a structure and absorbs vibrational energy to dampen vibration when an earthquake or the like occurs.

  Patent Document 1 has a buckling-restrained brace having a plate-like core member and a pair of restraint members disposed opposite to each other along both surfaces of the core member and in which joints are provided at both ends of the core member. The joint portion of the core member has a portion having a portion projecting in the width direction than the other portion of the core member, which is wider than the constraining member, and at both ends in the width direction of the joint portion. A buckling restrained brace with a stiffening rib is disclosed.

JP, 2014-77336, A

  However, in the above-described conventional buckling restrained brace, the joint portion for joining with another member is formed in an H shape, and there are cases where it is difficult to join with the other member. Although it is conceivable to change the H-shape into a cruciform joint, there is no case where the cruciform joint and the restraint member are appropriately arranged.

  This invention makes it a subject to provide the buckling restrained brace which has arrange | positioned suitably the junction part of a cross shape, and a restraint material in view of said situation.

  In order to solve the above problems, the buckling restrained brace of the present invention has a core member having joining ends for joining with other members at both ends of the plate-like portion, and a weak axial direction of the plate-like portion. And a restraint material disposed opposite to each face orthogonal to the face, and having a joint surface at the joint end so as to form a cruciform crossing the plane of the joint end. A cross junction member is provided, and a part of the cross junction member and an end of the restraint member overlap in a direction intersecting with the junction surface of the cross junction member.

  With the above configuration, the cross joint member and the restraint member overlap because a part of the cross joint member and the end portion of the restraint member overlap in the direction intersecting with the junction surface of the cross joint member. In each of the above, the required length can be secured appropriately. Thus, it is possible to obtain a buckling restrained brace in which the cruciform joint and the restraint member are appropriately arranged.

  A notch may be formed at the end of the constraining member, which is the overlapping portion, and the part of the cross-joining member may be located at the notch. According to this, it is possible to avoid the complication of the shape of the cross junction member by using a flat plate as the cross junction member.

  Even if rotation of the plate-like portion with respect to the joint end of the core member occurs due to a bending hinge, the part of the cross-joining member does not hit the restraint member at a portion where the notch is formed. The width of the notch may be set. According to this, the obstacle to the rotation due to the bending hinge is eliminated, and damage to the constraining material due to bending or axial force entering the constraining material is prevented.

  A reinforcing lid member may be provided at the end of the restraint member where the notch is not formed, for reinforcing the end. According to this, reinforcement of the end of the above-mentioned restraint material can be aimed at.

  The reinforcement board arrange | positioned so that the edge part side of the said restraint material may be pinched | interposed with the said core material may be provided, and the said one part of the said cross-joining member may be located below the said reinforcement board. According to this, it is possible to reinforce the end portion side of the restraint material by the reinforcing plate while appropriately arranging the cruciform joint and the restraint material.

  According to the present invention, it is possible to provide a buckling restrained brace in which a cruciform joint and a restraint member are appropriately arranged.

It is a general | schematic longitudinal cross-sectional view which showed the buckling restrained brace of embodiment of this invention, Comprising: The figure (A) has shown the completion state, and the figure (B) has shown the decomposition | disassembly state. The same figure (A) is the perspective view which showed the core material etc. of the buckling restrained brace of FIG. 1, and the same figure (B) is the perspective view which showed the state which added the restraint material. The figure (A) is a perspective view showing a state in which a width direction stiffener is further added to the state of FIG. 2 (B), and the figure (B) is a perspective view showing a state in which a reinforcing plate is further added. FIG. It is the fragmentary perspective view which expanded and showed the joint end part etc. of the core material of the buckling restrained brace of FIG. It is the fragmentary perspective view which expanded and showed the connection end part etc. of the completion state of the buckling restrained brace of FIG. It is explanatory drawing which showed the restraint material used by the buckling restraint brace of FIG. It is the fragmentary perspective view which abbreviate | omitted and shown the reinforcement board etc. in FIG. It is explanatory drawing explaining the detail of the location of the junction part by the junction edge part of the buckling restrained brace of FIG. 1, and a cross junction member. It is explanatory drawing which showed the non-stiffening area of the buckling restrained brace of FIG. It is explanatory drawing which showed the mode of a deformation | transformation of the buckling restrained brace of FIG. 1 when horizontal force acts on the construction surface by a column-beam.

Hereinafter, an embodiment of the present invention will be described based on the attached drawings.
As shown in FIGS. 1 (A), 1 (B), 2 (A), 2 (B), 3 (A) and 3 (B), the buckling restrained brace 1 of this embodiment The core 11, the restraint 12, the insertion plate 13, the unbonded material 14, the width direction stiffener 15, and the reinforcing plate 16 are provided.

  The core material 11 is made of, for example, a steel plate, and has joint end portions 111 at both ends of the plate-like portion 11a. The plate-like portion 11a has a constant width, and the bonding end portions 111 at both ends are wider than this. A cross joint member 112 is welded to the joint end 111, and a joint 110 is formed by the joint end 111 and the cross joint member 112. The cross section of the joint portion 110 in a plane orthogonal to the longitudinal direction of the plate-like portion 11 a is a cross shape, and other members can be joined to the cross portion joint portion 110.

  In the boundary region from the plate-like portion 11a to the joining end portion 111, the width of the plate-like portion 11a gradually widens in a curved shape to form a bolt hole forming front portion 111a in the joining end portion 111, Further, on the tip end side, a bolt hole forming portion 111c is formed via the widened portion 111b. The wide portion 111b is an inclined region connecting the front portion 111a for forming a bolt hole and the portion 111c having a wider width than this, and a starting point portion of the wide portion is formed into a curved surface. Further, as also shown in FIG. 4, flange plates 18 are fixed by welding to both edges of the bolt hole forming near side portion 111 a.

  Further, a bolt hole forming front portion 112a is formed in the cross joint member 112, and a bolt which becomes a joint surface via the widening portion 112b on the side which becomes the end of the buckling restrained brace 1 A hole forming portion 112c is provided. The widened portion 112b is an inclined region connecting the bolt hole forming front portion 112a and the bolt hole forming portion 112c having a wider width than this, and the starting point portion of the widened portion is formed into a curved surface.

  The restraint member 12 is formed of a square steel pipe having a rectangular cross section. The square steel pipe has a first surface portion on the long side of the rectangle and a second surface portion on the short side. The constraining member 12 is disposed so that the first surface portion faces each surface orthogonal to the weak axis direction (plate thickness direction of the core member 11) of the plate-like portion 11a of the core member 11. Both end portions in the longitudinal direction of the constraining material 12 extend beyond the curved wide portion of the core member 11 and reach the vicinity of the starting point of the widening of the wide portion 111b. That is, both end portions in the longitudinal direction of the constraining member 12 are as close as possible to the bolt hole forming portion 111c within the range not affecting the bonding using the bolt hole forming portion 111c. Moreover, the said square steel pipe has the corner | angular part which has a curved-surface area | region (R part) in the intersection location of each surface part.

  Further, as shown in FIGS. 5 and 6, a U-shaped notch is also provided at the end of the first surface portion of the restraint member 12 on the side facing the surface orthogonal to the weak axis direction of the plate-like portion 11a. The portion 12 a is formed in the longitudinal direction of the restraint member 12. Then, the height of the bolt hole formation front portion 112a which is the end of the cross joint member 112 is made lower than the height of the second surface of the restraint member 12, and the bolt hole formation front portion is formed in the notch 12a. I am swallowing the 112a. That is, the bolt hole formation near side portion 112a of the cross joint member 112 and the end portion of the restraint member 12 overlap in the direction intersecting with the bolt hole formation portion 112c (joining surface) of the cross joint member 112. ing.

  In addition, the end portion (opening end) of the restraint member 12 and a portion other than the portion where the bolt hole formation front portion 112a of the cross joining member 112 is located (a portion where the notch 12a is not formed ) Is provided with a reinforcing lid 19 for reinforcing the end. At the time of large deformation, there is a possibility that the end of the constraining member 12 may open in the weak axis direction of the core member 11. However, the opening is suppressed by providing the reinforcing lid 19.

  The insert plate 13 is made of a steel plate and is provided between the plate-like portion 11 a and the restraint members 12. And the said insertion plate 13 is contacting the 1st surface part of the said square steel pipe which is the said restraint material 12. Moreover, the said insertion plate 13 has the width | variety which corresponds to the length between the surfaces of the 2nd surface part of the said square steel pipe. Of course, not limited to such a width, the inserted plate 13 has a width equal to or less than the length between the surfaces of the second surface of the square steel pipe and equal to or greater than the width of the first surface other than the curved surface area. May be Further, if the inserted plate 13 has a length reaching the opening end of the restraint member 12, the inserted plate 13 is provided with the same notch as the notch 12 a.

  As shown in FIG. 2A, pin-shaped anti-slip protrusions 11c are provided on both sides in the longitudinal direction of the core 11 and in the center in the width direction. ing. The anti-slip protrusion 11 c is inserted into the hole provided in the first surface portion, which is the inner side of the restraint member 12, and the hole formed in the insertion plate 13, at the time of assembly of the buckling restrained brace 1. The anti-slip projection 11c is made of steel such as a steel rod, and is inserted into and joined to a hole provided in the core 11, for example.

  Further, in the core member 11, intermediate slits 11d for adjusting the proof stress are provided on both sides in the length direction of the core member 11 sandwiching the anti-slip protrusion 11c. In each of the middle slits 11d, an internal deformation preventing member made of steel or the like to be a spacer is inserted so as to be movable relative to the middle slit 11d in the longitudinal direction. The internal deformation preventing material is interposed between the insertion plates 13 and 13, and the position is regulated by the insertion plates 13 and 13 in the depth direction of the intermediate slit 11d.

  The unbonded material 14 is provided between the plate-like portion 11 a and the intercalated plate 13, and when the plate-like portion 11 a receives a compressive force with the thickness of the unbonded material 14 as a clearance, it is corrugated. Deformation is about to occur. The unbonded material 14 is made of, for example, butyl rubber.

  The width direction stiffener 15 is made of a steel plate and restrains the deformation of the core 11 in the width direction (within the surface). The width direction stiffener 15 is bridged between the second surfaces of the restraints 12 and 12 and is fixed to the restraints 12 by a weld 15a (see FIG. 1). Further, as shown in FIG. 7, a U-shaped cut portion 15b having an opening is formed at an end portion of the width direction stiffener 15, and the cut portion 15b is formed in the cut portion 15b. The curved surface area from the plate-like portion 11 a to the bonding end portion 111 is located.

  By forming the cut portion 15b, the portion in the vicinity of the joint end portion 111 in the core member 11 is not restrained in the width direction, and as shown in FIG. 9, it becomes a non-stiffened section (hatched portion). . By thus fixing the width direction stiffener 15 to the constraining member 12 and providing a non-stiffening section in the direction of the strong axis in the vicinity of the joint end 111 in the core member 11, the buckling restrained brace in large deformation A bending hinge is formed in 1 to prevent the restraint member 12 and the insertion plate 13 from being damaged by bending or axial force entering the restraint member 12 or the insertion plate 13.

When the bending hinge is formed, the bolt hole forming front portion 112a, which is a part of the cross-joining member 112, may come into contact with the restraint member 12 in the portion where the notch 12a is formed. The notch width at which such contact does not occur is set in the notch 12a. FIG. 10 shows a state of deformation when a horizontal force is applied to the construction surface of the beam. Assuming that the rotation angle of the bending hinge assumed in this case is θ _ji , the width of the notch 12a is set so that the above-mentioned contact in the notch 12a does not occur even when such rotation occurs. design. In addition, the said notch part 12a may be formed in the substantially V shape which makes a width | variety not only U shape but widen toward the opening end side.

  The reinforcing plate 16 is made of a steel plate, is overlapped on the end sides of the non-stiffening section (the cut portion 15b) and the bolt hole forming front portion 112a, and is provided in contact with the first surface portion of the restraint member 12 There is. That is, the reinforcing plate 16 is disposed so as to sandwich the end portion side of the constraining member 12 with the core member 11, and the bolt hole forming front portion 112 a in the cross joint member 112 is more than the reinforcing plate 16. It is located on the lower side. The reinforcing plate 16 is fixed to the flange plate 18 by welding as shown in FIG. Although the frame shape is formed by the reinforcing plate 16 and the flange plate 18, a frame member corresponding to the reinforcing plate 16 and the flange plate 18 may be manufactured using a square steel pipe.

  When the end portion of the restraint member 12 opens in the weak axis direction of the core member 11, the end portion of the buckling restrained brace 1 is damaged. However, the damage is caused by providing the reinforcing plate 16 Is prevented. That is, the reinforcing plate 16 can reinforce the end portion side of the restraint member 12 while appropriately arranging the cruciform joint portion 110 and the restraint member 12. Further, by providing the reinforcing plate 16 so as to overlap the non-stiffening section, the cut portion 15b can be made less visible.

  Welds at locations other than the surface where the insert plate 13 and the restraint member 12 contact, for example, at four corners where the corner between the restraint member 12 and the insert plate 13 are concave May be fixed to the restraint member 12.

  Next, details of the portion of the bonding portion 110 by the bonding end portion 111 and the cross bonding member 112 will be described. In FIG. 8, the axial joint length corresponds to the length of the bolt hole forming portion 111 c at the joint end 111. The core reduction / widening portion corresponds to a section from the end of the restraint member 12 to the end of the bolt hole forming front portion 112a (start point of the wide portion 112b). Further, this section corresponds to the formation position of the widening portion 111b. The cut portion 12a of the constraining member 12 is formed even if the core member 11 is compressed due to a wavelike deformation when the plate-like portion 11a is subjected to a large deformation when the core material contraction / spreading portion is compressed. The end of the first surface on the side not being set is set to a length that does not hit the widening portion 112 b.

  Further, the formation positions of the widening portion 111b and the widening portion 112b are such that the widening portions 112b are shifted toward the end of the core material 11 so as not to overlap each other, and cross junction with the joining end 111 The positions of the bolt holes of the bolt hole forming portions 111c and 112c in the member 112 are shifted. The cross joint member bonding length is the length of the bolt hole forming portion 112c, and is made to coincide with the distance from the end of the bolt hole forming portion 111c to the center of the far bolt hole.

  The steel pipe margin A corresponds to the amount of protrusion of the restraint member 12 from the end of the reinforcing plate 16. When the core 11 is elongated due to large deformation, the end of the reinforcing plate 16 approaches the end of the restraint 12, but when the end of the restraint 12 is open, the end is When the end of the reinforcing plate 16 is hit, the end of the buckling restrained brace 1 is damaged. While providing the reinforcing plate 16 at a position as close as possible to the wide portion 111 b of the core material 11, the steel pipe margin A is provided so that the above-described contact does not occur.

  Further, the steel pipe margin B corresponds to the length between the end of the bolt hole forming near side 112a that is drawn into the notch 12a and the closed end (the far end) of the notch 12a. The steel pipe margin B has a length such that the end of the bolt hole forming front portion 112a does not hit the closed end of the notch 12a even if the plate-like portion 11a is shrunk when the core member 11 is greatly deformed. It is set to.

  Further, the core material shrinkage is a length from the starting point of the curved surface area from the plate-like portion 11a to the joining end portion 111 to the closed end (the far end) of the cut portion 15b of the width direction stiffener 15 Equivalent to. The core material shrinkage is set such that the starting point of the curved surface region does not hit the closed end of the cut portion 15b in the core material 11, even if the plate-like portion 11a is shrunk during large deformation. The width direction stiffener cut portion length corresponds to the length from the open end to the closed end of the cut portion 15 b of the width direction stiffener 15.

  The steel pipe notch length corresponds to the length from the open end to the closed end of the notch 12a. Further, the wicking length corresponds to the length of the front portion 112 a for forming the bolt hole. The reinforcing plate width corresponds to the width of the reinforcing plate 16. The shaft side joint portion width corresponds to the width (height) of the joint end 111. In addition, the cross joint member side joint portion width corresponds to the width (height) of the cross joint member 112. The cross joint member wicking height corresponds to the height of the bolt hole forming front portion 112a.

  With the above configuration, a part of the cross joining member 112 and an end portion of the restraint member 12 overlap in the direction intersecting the joining surface of the cross joining member 112, so the cross joining member 112 And in each of the above-mentioned restraint material 12, a required length can be secured appropriately. For example, while bringing the both end portions in the longitudinal direction of the restraint member 12 as close to the bolt hole forming portion 112c as possible within the range not affecting the bonding in the bolt hole forming portion 112c, the required length of the cross joint member 112 is also required. Can be secured. Therefore, it is possible to obtain the buckling restrained brace 1 in which the cruciform joint portion 110 and the restraint member 12 are appropriately disposed.

  If the bolt hole forming portion 112c of the cross joint member 112 is positioned at the notch 12a formed in the end portion of the restraint member 12 which is the overlapping portion, a flat plate is used as the cross joint member 112. It is possible to avoid the complication of the shape of the cross joint member 112.

  If the width of the cutaway portion 12a is properly set in consideration of the bending hinge, the obstacle to the rotation by the bending hinge is eliminated, and the constraining member 12 is damaged by bending or axial force and the constraining member 12 is damaged. You can prevent

  When the reinforcing lid 19 is provided at the end of the constraining material 12, the end of the constraining material 12 can be reinforced.

  When the bolt hole forming portion 112 c of the cross joint member 112 is positioned lower than the reinforcing plate 16, the reinforcing plate 16 is properly disposed while the cruciform joint portion 110 and the restraint member 12 are appropriately disposed. Thus, the end portion side of the restraint member 12 can be reinforced.

  In the above example, the bolt hole formation front portion 112a of the cross joint member 112 is configured to be inserted into the end portion of the restraint member 12, but the present invention is not limited thereto. For example, the bolt hole formation near side portion 112a may be formed into a substantially Y-shaped bifurcated portion, and the bifurcated portion may be positioned on both outer sides of the end portion of the restraint member 12. Also in this structure, a structure in which a part (the bolt hole forming front part 112a) of the cross joint member 112 and an end of the restraint member 12 overlap in a direction intersecting the joint surface of the cross joint member 112. It becomes. Moreover, in this structure, the notch 12 a may not be formed at the end of the restraint member 12. Further, in this structure, the reinforcing lid 19 may not be provided at the end of the constraining member 12.

  Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same or equivalent scope of the present invention.

DESCRIPTION OF SYMBOLS 1 buckling-restrained brace 11 core member 11 a plate-like portion 110 joint portion 111 joint end portion 111 a bolt hole formation side portion 111 b widening portion 111 c bolt hole formation portion 112 cross joint member 112 a bolt hole formation front side portion 112 b widening portion 112 c bolt hole formation Portion 12 Restraint member 12a Notched portion 13 Inserted plate 14 Unbonded material 15 Width direction stiffener 16 Reinforcing plate 18 Flange plate 19 Reinforcing lid member

Claims (4)

A constraining member comprising a core member having joining ends for joining with other members at both ends of the plate-like portion, and a square steel pipe disposed opposite to each surface orthogonal to the weak axis direction of the plate-like portion. And the junction end portion has a height lower than that of the joint surface and the joint surface so as to form a cruciform crossing the plane of the joint end. to which cross joint member is provided with a low site was the end of the low portion and the restraining member of the cross joint member is present in duplicate in a direction crossing the joint surface of the cross joint member Yes,
A notch is formed in one of the end portions of the constraining member, which is the overlapping portion, facing and facing the plate-like portion, and the low portion of the cross-joining member is formed in the notch. A buckling restrained brace characterized by being positioned . The buckling restrained brace according to claim 1, wherein, even if rotation of the plate-like portion with respect to the joining end portion of the core material occurs due to a bending hinge, the restrained material of the portion forming the notch portion. A buckling restrained brace characterized in that a width of the notch portion is set so that the low portion of the cross-joining member does not hit.   The buckling restrained brace according to claim 1 or 2, wherein a reinforcing lid member for reinforcing the end portion is provided at an end portion of the restraint member where the notch portion is not formed. A buckling restrained brace characterized by being The buckling restrained brace according to any one of claims 1 to 3, further comprising a reinforcing plate arranged to sandwich an end side of the restrained member with the core member, and the cross-joined member A buckling-restrained brace characterized in that the lower portion of the above is positioned below the reinforcing plate.

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