JP5498122B2 - Construction method of buckling restraint brace mounting structure - Google Patents

Description

The present invention relates to a method for constructing a mounting structure of the buckling restrained brace for mounting a buckling-restrained brace framework of a building structure.

  A buckling-restrained brace is a type of damping damper, and is a damper that is incorporated as a brace in a framework of a building structure and functions to absorb vibration energy when a large deformation occurs in the framework due to an earthquake or the like. Buckling-restrained braces have been developed since the late 1980s, and many products are now on the market. In a buckling restrained brace, a brace core material made of an elongated member such as a steel material that undergoes plastic deformation so as to expand and contract under a longitudinal compression load and a tensile load, and a brace core material subjected to a longitudinal compression load buckle. And a buckling restraining stiffening material for stiffening the brace core material. As the stiffener, a stiffener made of a steel material such as a steel pipe that slidably contacts the side surface or side edge of the brace core material, a steel pipe or steel plate container surrounding the brace core material, and this container body. A stiffening material is used which is composed of a curable filler such as concrete or mortar to be filled therein, and in which the surface of the cured filler comes into contact with the surface of the brace core material in an unbonded state. Furthermore, it has also been proposed that the stiffening material surrounding the brace core is made of reinforced concrete so that the surface of the concrete comes into contact with the surface of the brace core in an unbonded state. Prior art documents disclosing buckling-restrained braces include, for example, Patent Document 1 and Patent Document 2 shown below.

JP2007-291704A JP 2008-002133 A

  When the buckling restraint brace is attached to the framework of the building structure, both ends of the brace core material of the buckling restraint brace are joined to the framework. Since the joint is required to have rigidity and proof strength, the structure of the joint tends to be complex, which can increase the cost of building structures using buckling-restrained braces. It was a problem.

  The present invention has been made to solve the above problems, and an object of the present invention is to join a framework of a building structure to which a buckling restraint brace is attached and an end of a brace core material of the buckling restraint brace. Is to reduce the cost of building structures using buckling-restrained braces.

A method for constructing an attachment structure for a buckling restraint brace according to the present invention is a construction method for an attachment structure for attaching a buckling restraint brace to a framework of a building structure, and includes a step of manufacturing the buckling restraint brace, The buckling-restrained braces are arranged in parallel with each other and extend in parallel with each other, and a plurality of elongated flat plate-shaped brace cores that are plastically deformed so as to expand and contract in response to a longitudinal compressive load and a tensile load; The brace core is formed to surround the plurality of brace cores and extend parallel to the plurality of brace cores, and to prevent the brace cores subjected to a longitudinal compressive load from buckling. Each of the plurality of brace cores so that both ends thereof protrude outward from both ends of the stiffener. The construction method further includes the step of manufacturing a gusset plate made of a steel plate for joining the ends of the plurality of brace core members of the buckling restrained brace, and the gusset plate is fixed to a framework of the building structure. Configure as possible. In the buckling-restrained brace manufacturing step, the plurality of brace core members are configured such that the gusset plate is sandwiched between end portions on the same side of the brace core members. In the buckling-restrained brace manufacturing step and the gusset plate manufacturing step, bolt holes are formed in end portions of the plurality of brace core members and the gusset plate, and the bolt holes are inserted into the bolt holes and the bolts. An end of the plurality of brace core members and the gusset plate are formed so as to be fastened by a nut screwed to the gusset plate. Further, the end portions of the plurality of brace core members are sandwiched between the end portions on the same side of the plurality of brace core members by inserting bolts inserted into the bolt holes and nuts screwed into the bolts. After fastening the gusset plate, the gusset plate is fixed to a framework of the building structure, and the buckling restrained brace is attached to the framework of the building structure.

  At least one of the bolt hole at the end of the brace core and the bolt hole of the gusset plate may be a long hole that can adjust the attachment position in the longitudinal direction of the buckling restraint brace.

  Each of the plurality of brace cores may be made of steel, superplastic material, or a combination thereof.

  The brace core material may have a partially reduced cross-sectional area in the longitudinal direction.

  The stiffener is composed of a reinforced concrete beam member, and the reinforced concrete beam member includes a plurality of main bars extending in the longitudinal direction of the reinforced concrete beam member and a band bar surrounding the main bars. It is good to have it.

  The reinforced concrete beam member may include a prestressed concrete steel wire that introduces a compressive load in the longitudinal direction of the reinforced concrete beam member.

  The beam member made of reinforced concrete may be provided with a decorative layer covering the outer peripheral surface thereof.

  The stiffener may be composed of a steel pipe surrounding the plurality of brace cores and a grout filled in the steel pipe.

  The stiffener may be made of a steel material that is slidably abutted against a side surface or a side edge of the brace core material.

According to the construction method of the buckling-restraining brace mounting structure according to the present invention, the structure of the joint portion that joins the framework of the building structure to which the buckling-restraining brace is attached and the end portion of the brace core material of the buckling-restraining brace is provided. Simplified, thereby reducing the cost of building structures using buckling restrained braces.

(A) And (B) is two longitudinal cross-sectional views of the buckling restraint brace in the attachment structure of the buckling restraint brace which concerns on embodiment of this invention, respectively, (C) is crossing of the buckling restraint brace. FIG. It is the side view which showed the junction part of the edge part of a brace core material, and the gusset plate in the attachment structure of the buckling restraint brace of FIG. FIG. 3 is a cross-sectional view of a buckling restrained brace that can be used in place of the buckling restrained brace shown in FIGS. 1 and 2.

  Below, the attachment structure of the buckling restraint brace which concerns on embodiment of this invention which is an attachment structure for attaching a buckling restraint brace to the framework of a building structure is demonstrated. 1A, 1B, and 1C are cross-sectional views of a buckling restrained brace 10 in the buckling restrained brace mounting structure according to the embodiment of the present invention, and FIG. (C) is a longitudinal sectional view along the line AA in (C), (B) is a longitudinal sectional view along the line BB in (C), and (C) is along the line CC in (B). It is a cross-sectional view. The buckling-restrained brace 10 is a kind of damping damper, and is incorporated as a brace in a framework of a building structure, and functions to absorb vibration energy when a large deformation occurs in the framework due to an earthquake or the like.

  The buckling-restraining brace 10 includes a plurality of (two in the illustrated embodiment) brace cores 12 that are plastically deformed so as to expand and contract in response to a longitudinal compressive load and a tensile load. The plurality of brace core members 12 are arranged in parallel to each other and extend in parallel to each other. The brace core 12 may be made of a steel material such as SS steel, SM steel, SN steel, or LY steel, or may be made of a superplastic material, or a combination of these materials. Sometimes produced.

  The buckling restraint brace 10 further includes a buckling restraining stiffener 14 for stiffening the brace core member 12 to prevent the brace core member 12 that has received a compressive load in the longitudinal direction from buckling. The stiffener 14 surrounds the periphery of the two brace cores 12 and extends in parallel with the brace cores 12. Each of the two brace cores 12 is stiffened at both ends. Projecting outward from both ends of the material 14. The stiffener 14 includes a round steel pipe 16 and a grout 18 filled in the round steel pipe 16 and solidified. The brace core 12 and the grout 18 are in an unbonded state. In order to bring both into an unbonded state, for example, an unbonding agent such as grease is applied to the surface of the brace core 12, and then the grout 18 is filled in the round steel tube 16 and solidified. In addition, if the operation | work which fills a steel pipe with grout is performed at the construction site of a building structure, the advantage that the conveyance movement of a heavy article can be made unnecessary is acquired. In addition, a square steel pipe can be used instead of the round steel pipe 16, and various steel plate members that function in the same manner as the steel pipe can be used.

  In order to attach the buckling restraint brace 10 to the framework of the building structure, both ends of the brace core 12 are joined to the framework of the building structure. FIG. 2 shows a specific example of a framework of a building structure to which the buckling restraint brace 10 is attached. In the figure, reference numeral 20 denotes a steel pipe beam forming a part of the framework. The illustrated skeleton includes a gusset plate 22 made of a steel plate for joining ends of a plurality of brace cores 12 of the buckling-restraining brace 10, and the gusset plate 22 is welded to a steel pipe beam 20 to form a skeleton. It is fixed.

  As is clear from FIG. 1A, the plurality of brace cores 12 of the buckling-restrained brace 10 can sandwich the gusset plate 22 between the end portions on the same side of the brace cores 12. It is configured. In addition, a plurality of bolt holes 24 are formed at the end of the brace core material 12, and a plurality of bolt holes (not shown) corresponding to the bolt holes 24 are also formed in the gusset plate 22. The end portion of the brace core 12 and the gusset plate 22 are fastened by a bolt 26 inserted into the bolt hole and a nut 28 screwed into the bolt 26.

  In the illustrated embodiment, as shown in FIG. 1 (B), the bolt hole 24 at the end of the brace core 12 is a long hole extending in the longitudinal direction of the brace core 12, and thereby the seat. The attachment position adjustment in the longitudinal direction of the bending restraint brace 10 can be performed. This mounting position adjustment can also be made by making the bolt hole of the gusset plate 22 a long hole, and therefore, at least one of the bolt hole 24 at the end of the brace core 12 and the bolt hole of the gusset plate 22. Is preferably a long hole that can adjust the mounting position.

  A construction method according to an embodiment of the present invention for constructing a buckling restraint brace mounting structure according to the present invention includes a step of manufacturing a buckling restraint brace. The buckling restrained braces manufactured in this step are arranged in parallel to each other and extend in parallel with each other like the buckling restrained brace 10 described above, and expand and contract in response to a longitudinal compressive load and a tensile load. A plurality of elongated flat plate core materials that are plastically deformed, and those that have received a compressive load in the longitudinal direction, surrounding the periphery of the plurality of brace core materials and extending in parallel with the plurality of brace core materials In order to prevent the brace core from buckling, the brace core is provided with a stiffener that stiffens the brace core, and each of the plurality of brace cores has stiffeners at both ends. It protrudes outward from both ends.

  The construction method according to this embodiment further includes the step of producing a gusset plate made of a steel plate for joining the ends of the plurality of brace core members of the buckling restrained brace. The gusset plate manufactured in this step is configured as a gusset plate that can be fixed to the framework of the building structure by welding or other appropriate means, like the gusset plate 22 described above.

  Further, in the step of manufacturing the above-described buckling restraint brace, the plurality of brace core members of the buckling restraint brace are configured such that the gusset plate is sandwiched between the end portions on the same side of the brace core member. Further, in the step of manufacturing the buckling-restrained brace and the step of manufacturing the gusset plate described above, as in the buckling-restraining brace 10 and the gusset plate 22 described above, the end portions of the plurality of brace cores of the buckling-restraining brace are used. Bolt holes are formed in the gusset plates, and the bolt holes can be fastened to the end portions of the plurality of brace cores and the gusset plates by bolts inserted through the bolt holes and nuts screwed into the bolts. To form.

  Production of the above buckling restraint brace and gusset plate is usually performed in a factory. Subsequently, at the construction site of the building structure, after fixing the gusset plate to the framework of the building structure by welding or other appropriate means, the end portions on the same side of the plurality of brace cores of the buckling-restrained brace are fixed. The gusset plate is sandwiched between them, and the ends of the plurality of brace cores and the gusset plate are fastened by the bolts inserted through the bolt holes and the nuts screwed into the bolts. Attach to the frame of the object.

  Further, as a construction method according to a modified form of the construction method according to this embodiment, at least one of the end portion of the brace core and the gusset plate is not formed with a bolt hole, and the gusset plate is used for the building structure. After fixing to the framework, the necessary bolt holes may be formed after the gusset plate and the end of the brace core material fastened to the gusset plate are actually matched at the construction site. According to the construction method according to this modified embodiment, the buckling-restrained brace can be appropriately positioned on the framework of the building structure with higher accuracy than the bolt hole as a long hole.

  Further, in the construction method according to another embodiment of the present invention, if the buckling restrained brace and the gusset plate are produced in the same manner as the construction method according to the embodiment described above, and they are produced, Subsequently, a gusset plate is sandwiched between end portions on the same side of a plurality of brace cores of the buckling-restraining brace, and a bolt inserted into a bolt hole formed in them and a nut screwed to the bolt, To fasten the ends of the plurality of brace cores and the gusset plates. It is also possible to carry out until the conclusion at the factory. Thereafter, at the construction site of the building structure, a gusset plate is fixed to the building structure frame by welding or other appropriate means, and the buckling restrained brace is attached to the building structure frame. When using the construction method according to this embodiment, it is not always necessary to make at least one of the bolt hole at the end of the brace core and the bolt hole of the gusset plate a long hole, but at least one of them. If one is made into a long hole, when welding a gusset plate to a frame, the advantage that the welding groove of the gusset plate can be adjusted will be obtained.

  As is clear from the above description, according to the construction method according to the present invention for constructing the attachment structure of the buckling-restrained brace, after fixing the gusset plate to the frame by welding or the like, the brace core material is attached to the gusset plate. On the contrary, after the gusset plate is fastened to the end portion of the brace core, the gusset plate can be fixed to the frame by welding or the like.

  According to the buckling restraint brace mounting structure described above, and according to the construction method of the buckling restraint brace mounting structure described above, the end portion of the brace core material is fixed to the gusset plate fixed to the frame. Can be directly joined by bolts and nuts, and there are no other joining members, so the structure of the joint that joins the frame of the building structure and the end of the brace core of the buckling restraint brace Is greatly simplified.

  In implementing the buckling restraint brace mounting structure or the construction method thereof according to the present invention, the stiffener of the buckling restraint brace can be of various forms. For example, the buckling-restraining brace 10 'of the specific example shown in FIG. 3 includes a stiffener 14' made of a reinforced concrete beam material, and such a stiffener 14 'can also be used. The stiffener 14 ′ surrounds the brace cores 12 in an unbonded state with respect to the two brace cores 12, and extends in the longitudinal direction of the brace cores 12. The brace core 12 itself has the same configuration as the brace core 12 of the buckling restraint brace 10 described with reference to FIG. 1, and both ends thereof protrude outward from both ends of the stiffener 14 ′. Yes.

  As shown in FIG. 3, the stiffener 14 ′ configured as a reinforced concrete beam member surrounds a plurality of main bars 30 extending in the longitudinal direction of the stiffener 14 ′ and the periphery of the main bars 30. And a plurality of straps 32. When this stiffener 14 'is manufactured, for example, the main brace 30 and the band 32 are arranged in the mold, and the brace core material 12 with a suitable unbonding agent such as grease is applied to the surface. What is necessary is just to place and fill the concrete 34 in the formwork after positioning appropriately in the frame. It should be noted that other appropriate manufacturing processes may be employed. Thus, the buckling restrained brace 10 'having the stiffener 14' configured as a reinforced concrete beam member has an advantage that the manufacturing cost is relatively low.

  Furthermore, a prestressed concrete steel wire (PC steel wire) may be provided on the reinforced concrete beam member constituting the stiffener 14 '. In that case, a plurality of PC steel wires are extended in the longitudinal direction of the reinforced concrete beam member, and a compressive load is introduced by the PC steel wires in the longitudinal direction of the reinforced concrete beam member. The stiffener 14 'made of a beam-forming member can be made thinner and lighter.

  The stiffener 14 'made of a reinforced concrete beam member has an adequate function by preventing the rigidity of the reinforced concrete beam member from greatly decreasing even if cracks occur in the reinforced concrete beam member by appropriately setting the amount of the reinforcing bar. Can be fulfilled. In practice, it is often more advantageous to reduce the thickness and weight of the reinforced concrete beam member as much as possible than to prevent the reinforced concrete beam member from cracking. However, if cracks occur on the outer peripheral surface of the reinforced concrete beam member, there may be a problem in appearance and durability. Therefore, the reinforced concrete beam member constituting the stiffener 14 'has a decorative layer on the outer peripheral surface. It is preferable to coat with. In addition, the decorative layer is preferably formed of an elastic coating film that is formed by painting on the outer peripheral surface of the reinforced concrete beam member and can elastically extend when cracks occur on the outer peripheral surface of the reinforced concrete beam member. Such an elastic coating can well conceal cracks generated on the outer peripheral surface of the reinforced concrete beam member, and such a decorative layer can be formed at low cost. Alternatively, the decorative layer may be made of a decorative thin plate such as a thin iron plate or a fiber-reinforced plastic plate wound around the outer peripheral surface of the reinforced concrete beam member. Since such a decorative thin plate looks good, the appearance of the brace-type vibration damper can be further improved.

  As still another form of the buckling-restraining brace stiffener, the stiffener may be composed only of a steel material that abuts against the side surface or side edge of the brace core member 12 so as to be relatively slidable. As the steel material, a steel pipe may be used or a shape steel may be used. Furthermore, when the stiffener of such a form is used, the cross-sectional area of the brace core material 12 can be changed in the longitudinal direction. Therefore, for example, the brace core 12 may be configured such that axial strain is concentrated on a portion having a small cross-sectional area by partially reducing the cross-sectional area in the longitudinal direction. Further, the brace core material 12 may have a cross-sectional area that changes stepwise in the longitudinal direction so that when the longitudinal compressive load and the tensile load act on the brace core material 12. In addition, since the brace core 12 can be plasticized in stages, the vibration energy of the building structure to which the brace-type damping damper is attached is excellent from small amplitude vibration to large amplitude vibration. Can be absorbed.

As apparent from the above description, according to the construction method of mounting structure of buckling restrained brace according to the present invention, the framework and the end of the brace core of buckling-restrained braces building structure for mounting the buckling-restrained brace The structure of the joint that joins the parts is simplified, thereby reducing the cost of the building structure using the buckling restrained brace.

10, 10 'Buckling restraint brace 12 Brace core material 14, 14' Stiffener 16 Round steel pipe 18 Grout 20 Building structure frame (steel pipe beam)
22 Gusset plate 24 Bolt hole 26 Bolt 28 Nut

Claims (9)

In the construction method of the buckling restraint brace mounting structure for attaching the buckling restraint brace to the framework of the building structure,
Manufacturing a buckling-restrained brace, the buckling-restraining braces being arranged in parallel to each other and extending in parallel with each other, and plastically deformed to expand and contract in response to a longitudinal compressive load and a tensile load. A plurality of elongated flat plate-shaped brace cores, and the brace core material that surrounds the periphery of the plurality of brace cores and extends in parallel with the plurality of brace cores and receives a longitudinal compressive load. A stiffener for stiffening the brace core to prevent bending, and each of the brace cores protrudes outward from both ends of the stiffener. Like
Forming a gusset plate made of a steel plate for joining ends of the plurality of brace core members of the buckling restrained brace, the gusset plate configured to be fixed to a framework of a building structure And
In the buckling-restrained brace manufacturing step, the plurality of brace core members are configured such that the gusset plate is sandwiched between end portions on the same side of the brace core members,
In the buckling-restrained brace manufacturing step and the gusset plate manufacturing step, bolt holes are formed in end portions of the plurality of brace core members and the gusset plate, and the bolt holes are inserted into the bolt holes and the bolts are inserted into the bolt holes. An end of the plurality of brace cores and the gusset plate are formed so as to be fastened by a nut screwed to a bolt,
The ends of the plurality of brace cores and the gussets are formed by inserting bolts inserted into the bolt holes and nuts screwed into the bolts by sandwiching the gusset plate between ends on the same side of the plurality of brace cores. After fastening the plate, the gusset plate is fixed to the framework of the building structure, and the buckling restrained brace is attached to the framework of the building structure.
A method of constructing a structure for mounting a buckling-restrained brace characterized by the above. The at least one of the bolt hole at the end of the brace core and the bolt hole of the gusset plate is a long hole that can adjust the mounting position in the longitudinal direction of the buckling restraint brace. A method of constructing a mounting structure for a buckling-restrained brace according to 1 . Method for constructing a mounting structure of a buckling restrained brace of claim 1, wherein each of the plurality of braces core member, characterized in that shall consist of steel or superplastic material or combinations thereof. The brace core material method for constructing a mounting structure of a buckling restrained brace according to claim 1, characterized in that as of reduced cross-sectional area partially in the longitudinal direction. The stiffener is composed of a reinforced concrete beam member, and the reinforced concrete beam member includes a plurality of main bars extending in the longitudinal direction of the reinforced concrete beam member and band bars surrounding the main bars. The method for constructing a mounting structure for a buckling-restrained brace according to claim 1, wherein: 6. The buckling-restrained brace mounting structure according to claim 5 , wherein the reinforced concrete beam member includes a prestressed concrete steel wire that introduces a compressive load in a longitudinal direction of the reinforced concrete beam member. Construction method. 6. The method for constructing an attachment structure for a buckling-restrained brace according to claim 5, wherein the reinforced concrete beam member is provided with a decorative layer covering an outer peripheral surface thereof. The stiffeners, the mounting structure of the buckling restrained brace according to claim 1, characterized in that shall consist of a grout filled in the steel pipe and steel pipe for surrounding the plurality of braces core Construction method. The stiffener is constructed of a mounting structure of a buckling restrained brace of claim 1, wherein the assumed to be composed of relatively slidably in contact with steel material side to a side edge of said brace core Method.

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