JP4533360B2 - Buckling-restrained brace, load-bearing frame using buckling-restrained brace, and method of manufacturing buckling-restrained brace - Google Patents

Description

  The present invention relates to a buckling-restrained brace that can be bridged inside a vertical surface such as a wall of a building and a horizontal surface such as a floor to effectively prevent the deformation of the building against a horizontal force, and the buckling. The present invention relates to a load-bearing frame using a constraining brace and a method for manufacturing a buckling constraining brace.

  Conventional buckling-restrained braces are made by inserting a brace core material as a brace body using a steel plate or the like inside a stiffener material using a steel pipe or the like, and inserting a mortar into the gap between the brace core material and the stiffener material. In many cases, a structure filled with a curable material such as a synthetic resin is used.

  In the buckling-restrained brace configured in this way, the buckling of the brace core material that occurs when receiving a compressive load is constrained by the bending rigidity of the stiffener, so the brace core material with a relatively small cross-section is used. Further, it can sufficiently resist both the tensile force and the compressive force, and can obtain a reinforcing effect necessary as a brace. As a result, when a large horizontal force is generated in the building, such as during an earthquake, the brace core material with a small cross section can flexibly elastically expand and contract in response to these external forces, resulting in a spindle-type restoring force characteristic with a high energy absorption effect. In addition, it can exhibit excellent earthquake resistance without increasing the strength of the joints of buildings and surrounding structural materials. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2005-220637

  However, in order to reliably transmit the force of the brace core material to buckle to the stiffener, it is required to fill mortar or the like without generating a gap. Furthermore, in order to allow the brace core material to freely expand and contract, a high level of quality control is required, such as covering the brace core material with an insulating material and cutting off the brace core material and the filler. It becomes. As a result, the process becomes complicated and the filling operation itself takes time.

  And since the weight of a filler is added to a brace core material, the whole weight of a member increases large. As a result, the workability of parts manufacturing and logistics deteriorates and handling of cargo at construction sites where space is limited is particularly difficult.In addition, when loading parts into the upper floor, it is necessary to install a cargo handling machine, which increases efficiency. On the other hand, there is a risk that the burden on workers will be large and cause labor problems.

  The present invention is based on the fact that the outer stiffener is pressed against the brace core material by the deformed portion provided on the outer stiffener material, thereby suppressing the buckling of the brace core material. It is an object of the present invention to provide a functional buckling-restrained brace, a load-bearing frame using the buckling-restraining brace as a constituent member, and a method for manufacturing the buckling-restraining brace.

In order to achieve the above object, in the buckling restrained brace according to claim 1, a long plate-shaped brace core material that bears an axial force as a structural member, and a cylindrical shape that is substantially the same length as the brace core material. And an external stiffener formed by using metal to be extrapolated to the brace core, and the external stiffener is deformed inward by a pressure applied from the outside toward the brace core. The brace core material is crimped so as to be stretchable and deformable , and buckling of the brace core material is suppressed by the deformable portion.

In claim 2, as a structural member, a long plate-like brace core material that bears an axial force, a cylindrical shape that is substantially the same length as the brace core material, and extrapolated to the brace core material, and metal is used. And an internal stiffener inserted between the brace core in the internal space of the external stiffener, the external stiffener facing the brace core The inner stiffener is sandwiched between the deformed portion of the outer stiffener and the brace core material, thereby deforming the brace core. The material is crimped so as to be elastically deformable, and buckling of the brace core material is suppressed.In claim 3, the outer stiffener has a rectangular tube shape, and the brace core material is The internal stiffener is arranged at a position that divides the internal space of the external stiffener into two rectangular divided spaces of the same size. A pair of U-shaped cross-sectional shape members, each of the groove shape members are disposed in contact with the web toward the brace core material in each rectangular divided space, and the deformation portion is a groove. The outer stiffener and the inner stiffener are pressed against the brace core by abutting against the flange tip of the shape member. According to claim 4, the brace core is plated. Features.

  The load-bearing frame of the present invention is a load-bearing frame that uses the buckling-restrained brace according to any one of claims 1 to 4 as a constituent member, and has a rectangular outer peripheral frame and an installation projecting inside the outer peripheral frame. And a buckling-restraining brace is arranged inside the outer peripheral frame, and both ends of the brace core are fixed to the mounting plate, respectively.

In the method for manufacturing a buckling-restrained brace of the present invention, a long-plate-shaped brace core material that bears an axial force as a structural member, and a cylindrical shape that is substantially the same length as the brace core material, and the brace core material A method of manufacturing a buckling-restrained brace material that is extrapolated and has an external stiffener formed of metal, and inserts the brace core material into the external stiffener and The deformed part is formed by pressing the external stiffener from the outside to the inside by the brace assembly process and the press device that are placed in the predetermined position, and the brace core material is crimped by this deformable part so that it can be expanded and deformed. And a crimping process.

  In the buckling-restrained brace according to claim 1, the outer stiffener is crimped to the brace core by the deformed portion facing the inner side of the outer stiffener extrapolated to the brace core. Therefore, since no parts are used except those directly necessary for preventing buckling, the structure can be simplified, and a lightweight and functional buckling restrained brace can be obtained.

  Further, a buckling-restrained brace is constituted by a deformed portion formed by pressure applied to the outer stiffener made of metal from the outside by pressing the outer stiffener to the brace core. Therefore, it is possible to provide a deformed part of a necessary size only by controlling the applied pressure according to the type and thickness of the metal used for the external stiffener, while allowing expansion and contraction of the brace core material. Appropriate crimping of the external stiffener that can reliably suppress buckling deformation is obtained.

As in the invention according to claim 2, when an internal stiffener is further sandwiched between the deformed portion of the external stiffener and the brace core, a combination of the external stiffener and the internal stiffener The buckling of the brace core material can be reliably supported by the large rigidity synthesized by the above. Moreover, even if a special cross-sectional shape is adopted as the brace core material from the structural design, the brace core material can be reliably crimped at the deformed portion by appropriately changing and selecting the size and shape of the internal stiffener.

  As in the invention according to claim 3, an internal stiffener having a U-shaped cross section is formed in a rectangular divided space divided into two by a brace core material arranged in a position where the internal space of the rectangular cylindrical outer stiffener is divided into two. Since the brace core material is sandwiched between the webs, buckling can be stably supported while allowing the displacement in the length direction accompanying expansion and contraction. In addition, since the deformed portion is formed in contact with the flange tip of the channel member, the deformed portion formed by the external pressure is bulged between both flanges of the channel member. Therefore, the brace core material can be reliably crimped.

  As in the invention according to claim 4, when a brace core material plated is used, when the brace core material expands and contracts, a smooth shift is reliably generated between the outer stiffener material and the inner stiffener material. The seismic energy absorption effect of the brace core is fully demonstrated.

  The load-bearing frame of the present invention has both ends of the brace core material of the buckling-restraining brace fixed to a mounting plate that is provided so as to protrude inside the rectangular outer peripheral frame. The horizontal force is reliably supported by the brace core material, and when the brace core material expands and contracts, the seismic energy is converted into thermal energy and effectively attenuated. Therefore, the building frame incorporating the load-bearing frame can exhibit an excellent vibration control function at the same time while improving the horizontal load-bearing strength by the load-bearing frame.

  The method for manufacturing a buckling-restrained brace according to the present invention integrates a long plate-like brace core material that bears an axial force and an external stiffener that is extrapolated into the brace core material and formed using metal. Therefore, the brace core material is inserted into the external stiffener material, and the brace assembly process is performed, and the external stiffener material is pressed from the outside to the inside to form the deformed portion. And a crimping process for crimping to. Therefore, since it can be manufactured by a simple operation that does not require skill, the productivity is high and the quality does not vary. In addition, since the conventional curable filler is not included, the weight of the entire buckling-restrained brace is reduced, and the workability and safety at the manufacturing plant and the construction site are excellent.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the buckling restrained brace 1 includes a brace core material 2 that supports axial force in both the tensile and compression directions acting in the longitudinal direction as a structural member, and an extrapolation that is extrapolated to the brace core material 2. It comprises a rigid material 3. Further, in the present embodiment, an example in which the inner space of the outer stiffener 3 includes an inner stiffener 5 inserted between the brace core material 2 is illustrated.

  The brace core material 2 has a long plate shape, and has a width dimension of, for example, about 20 to 100 mm, 43 mm in this embodiment, and a thickness dimension of, for example, about 3 to 15 mm, in this embodiment, 6 mm. . The length dimension is appropriately set according to the size of the structure to which the brace core material 2 is attached. In this embodiment, the length dimension is 1300 mm.

  For the brace core material 2, steel materials such as carbon steel, stainless steel, and alloy steel are preferably used. Furthermore, in this embodiment, the brace core material 2 is plated. The plating finish is provided with a metal coating of about 0.1 to 5 μm, and hard chromium plating is suitably employed in addition to anticorrosion plating such as zinc, tin, and lead as the metal. The plating means can be selected according to the base material and purpose from electroplating, chemical plating by chemical change, hot dipping, vapor deposition plating and the like. When the brace core material 2 is plated in this way, when the brace core material 2 expands and contracts, a smooth misalignment occurs between the external stiffener 3 and the internal stiffener 5 that are in contact with each other. It is preferable in that the material 2 can be freely expanded and contracted and the effect of absorbing seismic energy is not impaired.

  The outer stiffener 3 has a cylindrical shape that is substantially the same length as the brace core 2, and in this embodiment, a rectangular cylinder having a square cross section surrounded by four face plates that are orthogonal to each other is used. . As the external stiffener 3, a rectangular tube whose cross-sectional shape is a long rectangle, a triangle, a regular polygon or the like, or a cylindrical body can be used. The outer stiffener 3 is formed using a metal that can be easily plastically processed, and similarly to the brace core 2, steel materials including carbon steel, stainless steel, and alloy steel are preferably used.

  The external stiffener 3 is extrapolated to the brace core 2 to assemble the buckling restrained brace 1. Therefore, the outer stiffener 3 is formed in a size that allows the brace core material 2 to be inserted. That is, the width dimension of the brace core material 2 is formed to be smaller by, for example, about 0.5 to 6 mm than the interval between the face plate portions of the external stiffener 3 facing each other in parallel. Furthermore, in this embodiment, the brace core material 2 is arranged at a position where the square internal space of the external stiffener 3 is divided into two rectangular divided spaces of the same size. Further, an internal stiffener 5 made of a groove member 6 having a U-shaped cross section is inserted into each of the two rectangular divided spaces. Moreover, as shown in FIG. 2, each channel member 6 is arranged in a direction in which the web 6 </ b> W overlaps the brace core material 2, so that each flange 6 </ b> F is connected to the brace core material 2 in the four face plate portions. They are arranged to face areas near both sides of a parallel face plate portion (hereinafter referred to as parallel face plate portion 21).

Furthermore, the parallel surface plate portion 21 of the outer stiffener 3 is formed with a deformed portion 4 that is smoothly curved inward by applying pressure from the outside toward the brace core 2. Although the deformation | transformation part 4 of this form is continuing over the full length of the external stiffening material 3, you may space apart the deformation | transformation part 4 formed independently by fixed length at intervals. . When the outer stiffener 3 and the inner stiffener 5 are pressed and integrated with the brace core 2 by such a deformable portion 4, a compression load is applied to the long brace core 2 as a result. The buckling that tends to occur in the brace core 2 is suppressed. However, since the crimping by the deformable portion 4 is obtained by plastic deformation of the metal, expansion and contraction of the brace core material 2 is allowed. In addition, the dent depth D of this deformation | transformation part 4 is about 0.03-3.0 mm, for example, Preferably it is 0.5-2.2 mm, and is 1.4 mm in this form.

  In this embodiment, as described above, the inner stiffener 5 inserted between the brace core 2 in the inner space of the outer stiffener 3 is the deformed portion 4 of the outer stiffener 3 and the brace core 2. Since the outer stiffener 3 and the inner stiffener 5 are combined, higher rigidity can be obtained, and the buckling of the brace core 2 can be reliably suppressed. In addition, even if the brace core material 2 has a special cross-sectional shape due to structural requirements, etc., the size and shape of the internal stiffener 5 can be changed and selected accordingly, so that the deformed portion 4 can brace. The core material 2 can be securely crimped.

  The internal stiffener 5 of this embodiment is constituted by a pair of U-shaped groove members 6 each having a U-shaped cross section, and each groove member 6 is directed toward the brace core member 2 in the respective rectangular divided spaces. Therefore, even if a load is applied to the brace core material 2 to expand and contract, a displacement in the length direction is allowed on the contact surface, and buckling can be stably supported.

  Further, the deformable portion 4 is formed by pressure from the outside. In this embodiment, the deformable portion 4 formed by bulging between the pair of flanges 6F, 6F of the groove member 6 is a pair of flanges 6F of the groove member 6. Since the outer stiffener 3 and the inner stiffener 5 are brought into pressure contact with the brace core 2 in contact with the tip of the 6F, it is preferable in that the brace core 2 can be securely crimped.

  In the above-described embodiment, the internal stiffener 5 is inserted between the brace core material 2 in the internal space of the external stiffener 3, but the external stiffener 5 is inserted without inserting the internal stiffener 5. The brace core material 2 may be directly sandwiched between the deformed portions 4 of the material 3, and the external stiffener 3 may be directly bonded to the brace core material 2.

  In this way, since the external stiffener 3 is pressed against the brace core 2 at the deformed portion 4 to prevent buckling, any components other than those that are directly reinforcing materials to prevent buckling should be used. Therefore, a lightweight and functional buckling restrained brace can be obtained. In addition, since the deformed portion 4 is formed by pressing the metal external stiffener 3 from the outside, the pressure applied according to the type and thickness of the metal used for the external stiffener 3 is managed appropriately. By providing the deformed portion 4 having a size, the outer stiffener 3 can be properly pressed against the brace core 2 and the buckling deformation of the brace core 2 can be reliably suppressed.

  As shown in FIG. 9 (B), the buckling restrained brace manufacturing method of the present invention inserts the brace core material 2 into the external stiffener 3 and places the external stiffener 3 in a predetermined position. As shown in FIG. 9C, the deforming portion 4 is formed by pressing the external stiffener 3 from the outside to the inside using a pressing device, and the external stiffener 3 is And a crimping process for crimping the brace core material 2.

  In this embodiment, as shown in FIG. 9 (A), a pair of inner portions having a U-shaped cross-section and substantially the same length as the brace core material 2 are arranged with the outer surface of the web facing the brace core material 2. A stiffener 5 is used. Then, as shown in FIG. 9B, in the brace assembly process, the brace core 2 and the pair of inner stiffeners 5 and 5 sandwiching the brace core 2 are aligned in a sandwich shape so that the inside of the rectangular outer stiffener 3 is formed. The brace core material 2 and the inner stiffener 5 are arranged at predetermined positions inside the outer stiffener 3. At this time, as shown in FIG. 2C, the thickness dimension of the brace core material 2 and the dimension obtained by adding the flange lengths of the two inner stiffeners 5 are the same as those of the parallel surface plate portion 21 of the outer stiffener material 3. For example, it is smaller than the interval by about 0.5 to 5 mm. Moreover, as described above, the width dimension of the brace core material 2 is formed to be slightly smaller than the distance between the face plates of the outer stiffener 3 facing each other in parallel, and the flange distance of the inner stiffener 5 is further increased. It is formed small. Therefore, the brace core material 2 and the inner stiffener 5 can be smoothly inserted into the outer stiffener 3.

  Next, in the crimping step, as shown in FIG. (C), the two parallel surface plates 21 of the outer stiffener 3 are perpendicularly directed from the outside to the inside by the upper and lower punches 22U and 22D of the press device. As shown in FIG. 1, the parallel surface plate portion 21 is curved inward to form a deformed portion 4 that is gently depressed. The outer stiffener 3 is pressure-bonded to the brace core 2 via the inner stiffener 5 by the deformed portion 4 formed in this way. As a result, even if the brace core material 2 receives a compressive force, the outer stiffener 3 and the inner stiffener 5 prevent buckling, so that the compressive force can be supported. Moreover, since the inner stiffener 5 is inserted into the outer stiffener 3 in the brace assembling process, and the buckling constraining brace 1 can be formed in the crimping process simply by pressurization using a press device. The buckling-restrained brace 1 can be manufactured by a simple operation without requiring skill. Therefore, high productivity can be obtained and quality variation of the buckling restrained brace 1 does not occur. Moreover, since the curable filler is not used, the entire buckling restrained brace 1 can be reduced in weight, and the workability and safety at the manufacturing plant and the construction site can be improved.

  The load-bearing frame of the present invention includes the buckling-restrained brace 1 formed and manufactured as described above as a constituent member. By attaching it to the building frame, the load-bearing frame bears the horizontal load and improves the earthquake-proof strength. As shown in FIG. 3, the load-bearing frame includes a rectangular outer peripheral frame 7 and a mounting plate 8 that projects from the outer peripheral frame 7.

  The outer peripheral frame 7 is composed of an upper frame 7U and a lower frame 7D that are horizontally arranged on the upper and lower sides, and vertical eaves frames 7V and 7V that connect the left and right ends of the upper frame 7U and the lower frame 7D. The frame material ends are fixed to each other to form a vertically long rectangular shape. Each frame member has a square tube shape with a square cross section, and in this embodiment, a 50 mm square steel pipe is used.

  As shown in FIG. 4, the upper end portion of the eave frame 7V and the side end portion of the upper frame 7U are fixed by fitting the upper plate 23 into the slits formed at the end portions of both frame members and welding. Similarly, as shown in FIG. 6, the lower end portion of the collar frame 7 </ b> V and the side end portion of the lower frame 7 </ b> D are fixed via the lower plate 24. Further, a horizontal upper mounting plate 25 is fixed to the upper end portion of the upper plate 23. Further, a horizontal lower mounting plate 27 is fixed to the lower opening U-shaped material 26 and the lower plate 24 lower portion provided at the lower portion of the collar frame 7V. The upper mounting plate 25 is provided with a screw hole 28, and a mounting bolt 29 inserted through a beam (not shown) can be screwed into the screw hole 28 to fix the upper portion of the load bearing frame. On the other hand, the underlaying plate 27 is provided with an insertion hole 30, and a lower portion of the load bearing frame can be fixed to a base, a beam, or the like by using a mounting bolt (not shown) inserted through the insertion hole 30.

  Further, as shown in FIGS. 3 and 5, a vertically long intermediate plate 31 facing inward is welded at a substantially intermediate height position of one collar frame 7 </ b> V.

  As shown in FIG. 1, the buckling-restraining brace used for the load-bearing frame is such that the both ends of the inner stiffener 5 protrude about 20 to 100 mm from the both ends of the outer stiffener 3. 5 is formed longer than the outer stiffener 3. Similarly, the brace core material 2 is formed to be longer than the internal stiffener material 5 to the extent that both end portions of the brace core material 2 protrude about 20 to 100 mm from both end parts of the internal stiffener material 5. Furthermore, the avoidance part 32 notched in the U-shape is formed in the both ends of the web of the inner stiffener 5.

  In this embodiment, a pair of buckling-restraining braces are disposed inside the outer peripheral frame 7 in a U-shape, and between the upper plate 23 and the intermediate plate 31 and between the intermediate plate 31 and the lower plate 24. Each is bridged. Then, the ends of the brace core 2 are fitted and welded to the notches formed in the upper and lower plates 23, 24 and the intermediate plate 31 in a diagonal line, and both ends of the brace core 2 are fixed. ing. Therefore, the horizontal force applied to the outer peripheral frame 7 by being attached to the building frame can be reliably supported by the brace core 2. Furthermore, since the brace core material 2 is supported by the outer stiffener 3 and the inner stiffener 5 and expands and contracts without causing buckling, the seismic energy is converted into heat energy and effectively attenuated. Thus, the building frame to which the load-bearing frame is attached can exhibit an excellent seismic control function while improving the horizontal load-bearing strength by the load-bearing frame.

  In this embodiment, the inner region of the outer peripheral frame 7 of the upper and lower plates 23 and 24 and the intermediate plate 31 constitute an attachment plate 8 for fixing the end portion of the brace core material 2. Further, the avoidance portion 32 of the inner stiffener 5 avoids interference between the buckling restraint brace and the mounting plate 8.

  7 and 8 illustrate another embodiment of the load-bearing frame. Hereinafter, different contents will be described, and other than that, only the same reference numerals are given to the main components shown in the figure. In this embodiment, the brace core material 2 is disposed in the same plane direction as the lower plates 23 and 24 and the intermediate plate 31 constituting the mounting plate 8, and therefore obliquely in the upper and lower plates 23 and 24 and the intermediate plate 31. The buckling restrained brace is attached by fitting and welding the end of the brace core material 2 to the formed rectangular notch 33. Since the buckling restrained brace is attached while the brace core 2 and the mounting plate 8 form a continuous surface in this way, the horizontal force applied to the load-bearing frame is more reliably transmitted to the brace core 2. , Which is preferable in that the deformation resistance is further improved.

  The above description is an example of the embodiment of the present invention. Therefore, the technical scope of the present invention is not limited to this, and various modifications are included in addition to the above-described embodiment.

It is a perspective view which illustrates one embodiment of the buckling restraint brace of the present invention. FIG. It is a perspective view which illustrates one embodiment of a load-bearing frame of the present invention. It is the principal part expansion perspective view. It is an expansion perspective view of a different principal part. Furthermore, it is an expansion perspective view of a different principal part. It is a perspective view which illustrates other embodiment of a load bearing frame. It is the principal part expansion perspective view. (A), (B), and (C) are schematic diagrams for sequentially explaining a method of manufacturing a buckling restrained brace of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Buckling restraint brace 2 Brace core material 3 Outer stiffening material 4 Deformation part 5 Inner stiffening material 6 Groove shape material 6F Flange 6W Web 7 Outer frame 8 Mounting plate

Claims (6)

A long plate-like brace core material that bears an axial force as a structural member, and a cylindrical member that is substantially the same length as the brace core material, is externally inserted into the brace core material, and is formed using metal. With stiffeners,
The outer stiffener has a deformed portion that is deformed inward by the applied pressure from the outside toward the brace core,
A buckling-restraining brace characterized in that, by this deforming portion, the brace core material is crimped so as to be elastically deformable and buckling of the brace core material is suppressed . A long plate-like brace core material that bears an axial force as a structural member, and a cylindrical member that is substantially the same length as the brace core material, is externally inserted into the brace core material, and is formed using metal. A stiffener and an internal stiffener inserted between the brace core in the internal space of the outer stiffener ;
The outer stiffener has a deformed portion that is deformed inward by the applied pressure from the outside toward the brace core,
The inner stiffener is clamped between the deformed portion of the outer stiffener and the brace core material so that the brace core material can be stretched and deformed and buckling of the brace core material is suppressed. A buckling-restrained brace characterized by being made . The external stiffener has a rectangular tube shape, and the brace core is disposed at a position that divides the internal space of the external stiffener into two rectangular divided spaces of the same size,
The inner stiffener is composed of a pair of U-shaped groove members, and each groove member is disposed in each rectangular divided space with the web in contact with the brace core member. ,
The buckling constrained brace according to claim 2, wherein the deformable portion abuts against a flange tip of the channel member, whereby the outer stiffener and the inner stiffener are pressed against the brace core.   The buckling restrained brace according to any one of claims 1 to 3, wherein the brace core material is plated. It is a load-bearing frame using the buckling restrained brace according to any one of claims 1 to 4 as a constituent member, and has a rectangular outer peripheral frame and a mounting plate projecting inside the outer peripheral frame,
A bearing frame characterized in that buckling-restraining braces are arranged inside the outer peripheral frame, and both end portions of the brace core material are respectively fixed to a mounting plate. A long plate-like brace core material that bears an axial force as a structural member, and a cylindrical member that is substantially the same length as the brace core material, is externally inserted into the brace core material, and is formed using metal. A method of manufacturing a buckling-restrained brace material comprising a stiffener,
A brace assembling step for inserting the brace core material into the outer stiffener and arranging it at a predetermined position inside the outer stiffener;
A deforming portion is formed by pressing the external stiffener from the outside toward the inside by a pressing device, and the deforming portion includes a crimping step of crimping the brace core material so as to be stretchable and deformable. A method of manufacturing a buckling restrained brace.

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