JP2008075280A - Buckling restricting brace and proof stress frame using buckling restricting brace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simply formed, lightweight, and functional buckling restricting brace and a proof stress frame using the buckling restricting frame as a component. <P>SOLUTION: This buckling restricting brace comprises a long plate-like brace core supporting an axial force and an auxiliary rigid member having the generally same length as the brace core and inserted onto the brace core. The auxiliary rigid member comprises a main auxiliary rigid member having a plate receiving part facing the brace core and a sub auxiliary member formed in U-shape in cross section, covering the receiving plate part of the main auxiliary member, and secured to the main auxiliary rigid member. The buckling of the brace core is suppressed by holding the brace core by the plate receiving part of the main auxiliary rigid member and the web of the sub auxiliary rigid member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a buckling-restrained brace that can be bridged inside a vertical structural surface such as a wall of a building and a horizontal structural surface such as a floor to effectively prevent deformation of the building against a horizontal force, and the seat. The present invention relates to a load-bearing frame using a bending restraint 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. Thus, it is possible to exhibit excellent earthquake resistance without increasing the strength of the joint portion of the building and the surrounding structural material (see, for example, 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 the curable material such as mortar without any gap. Furthermore, in order to allow the brace core material to freely expand and contract, a high level of technology and quality is required, such as a treatment that covers the brace core material with an insulating material and cuts the brace core material from the filler. Management is required. 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 basically suppressing the buckling of the brace core material by sandwiching the brace core material between the main stiffener receiving plate portion and the auxiliary stiffener web, and the structure can be simplified. It is an object of the present invention to provide a lightweight and functional buckling restrained brace and a load bearing frame using the buckling restrained brace as a constituent member.

  In order to achieve the above-mentioned object, in the invention according to claim 1, there is a long plate-like brace core material that bears an axial force, and has substantially the same length as the brace core material. A stiffener to be inserted, and the stiffener has a main plate stiffener having a receiving plate portion facing the brace core material, and has a U-shaped cross section, covering the main plate stiffener plate It consists of a main stiffener and a secondary stiffener that is fixed to the main stiffener. The brace core is sandwiched between the main stiffener receiving plate and the substiffener web to suppress buckling of the brace core. It is characterized by that.

  In the invention according to claim 2, the main stiffener has a rectangular tube shape in which four flat plate portions including the receiving plate portion are continuous, and the main stiffener and the sub stiffener are made of metal. The main stiffener and the sub-stiffener are fixed to each other by welding both flanges of the sub-stiffener to a pair of flat plates facing each other across the receiving plate.

  The invention according to claim 3 is characterized in that a center portion in the width direction of the receiving plate portion of the main stiffener is separated, and in the invention according to claim 4, the brace core material is plated. And

  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. It has a plate, the buckling restraint brace is arranged inside the outer peripheral frame, and both end portions of the brace core material are respectively fixed to the mounting plate.

  In the invention according to claim 1, since the brace core material is sandwiched between the main stiffener and the sub stiffener to improve buckling rigidity and prevent buckling, the rigidity of the brace core material is obtained. Since no parts are used other than those directly necessary for improving buckling and preventing buckling, a lightweight and functional buckling restrained brace can be obtained. In addition, since the brace core material is sandwiched between the main stiffener receiving plate and the secondary stiffener web, the rigidity against the compressive force of the brace core material is effectively reinforced and buckling occurs. Can be reliably suppressed.

  As in the invention according to claim 2, both the flanges of the auxiliary stiffener are welded to a pair of flat plates facing each other with the receiving plate interposed therebetween, and the main stiffener receiving plate and the secondary stiffener are fixed. When the brace core material is sandwiched with the web, the brace core material can be reinforced while being able to shift in the longitudinal direction and effectively suppressing buckling. Furthermore, since the welded main stiffener and sub-stiffener are firmly integrated, it is possible to reliably suppress the buckling deformation of the brace core material when a compressive force is applied.

  As in the invention according to claim 3, when the central portion in the width direction of the receiving plate portion of the main stiffener is separated, elasticity is provided between the receiving plate portion divided into two and the auxiliary stiffener. Since the brace core material can be clamped by being effective, it is possible to suppress the contact sound due to vibration and to clamp the brace core material with an appropriate spring force.

  When the brace core material with plating finish is used as in the invention according to claim 4, when the brace core material is expanded and contracted, a smooth shift occurs between the main stiffener material and the auxiliary stiffener material. It can be demonstrated without reducing the seismic energy absorption effect of the material.

  In the load-bearing frame of the present invention according to claim 4, since both ends of the brace core material of the buckling-restraining brace are fixed to a mounting plate that is provided so as to protrude inside the rectangular outer peripheral frame, the outer peripheral frame The horizontal force at the time of an earthquake loaded on can be reliably supported by the brace core material, and by the expansion and contraction of the brace core material, the seismic energy can be converted into heat energy and effectively attenuated. Therefore, the building frame to which the load-bearing frame is attached can exhibit an excellent seismic control function while improving the horizontal load-bearing capacity by the load-bearing frame.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a buckling-restrained brace 1 has a brace core material 2 that supports axial forces in both the tensile and compression directions acting in the longitudinal direction, and the brace core material 2 has substantially the same length. A stiffener 3 that is extrapolated to the core member 2 is provided. The stiffener 3 further includes a main stiffener 5 and a sub-stiffener 6.

  The brace core material 2 has a long plate shape, and has a width dimension of, for example, about 20 to 100 mm, 44 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. Further, the brace core material 2 of this embodiment 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 slip occurs between the main stiffener material 5 and the auxiliary stiffener material 6 that come into 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 can be sufficiently exhibited.

  As shown in FIG. 2, the main stiffener 5 has a flat plate-shaped receiving plate 4 facing the brace core 2. In this embodiment, the four flat plates 8 including the receiving plate 4 are respectively provided. Examples are those which are bent at a right angle to form a continuous rectangular tube shape. In addition, the main stiffener 5 of this embodiment is exemplified by the support plate portion 4 that is separated at the center portion in the width direction and lacked at a constant width. As described above, the receiving plate portion 4 includes a plate divided into a plurality of plate pieces while being arranged on the same plane, in addition to a flat plate that is continuous without interruption.

  In addition to this, the main stiffener 5 may be a rectangular cylinder such as a long rectangle, a triangle, or a regular polygon, or a cylinder such as a cylinder, or a T-shaped, L-shaped, or U-shaped section. A long material having various cross-sectional shapes such as a shape can be used. Moreover, a metal is used for the main stiffener 5 of this embodiment, and steel materials including carbon steel, stainless steel, and alloy steel are suitably used as with the brace core material 2.

  The auxiliary stiffener 6 is formed in a U-shaped cross section by a web 7 facing the receiving plate portion 4 of the main stiffener 5 and a pair of flanges 9, 9 bent at right angles from both sides of the web 7. . In addition, the auxiliary stiffener 6 of the present embodiment is made of a metal such as carbon steel, stainless steel, alloy steel, etc., like the main stiffener 5.

  The auxiliary stiffener 6 with the flange 9 facing the main stiffener 5 side sandwiches the brace core material 2 between the main stiffener 5 and the receiving plate 4, and covers the receiving plate 4 while covering the main plate. It is fitted on the rigid member 5. In this embodiment, a pair of flat plate portions 8 and 8 facing each other with the flange 9 tip of the auxiliary stiffener 6 and the receiving plate portion 4 of the main stiffener 5 sandwiched are fixed by fillet welding. At this time, the brace core material 2 is sandwiched between the receiving plate portion 4 and the web 7 of the auxiliary stiffener 6 without a gap. Therefore, the brace core material 2 between the backing plate portion 4 and the auxiliary stiffener 6 is supported so as to be displaced in the longitudinal direction, and buckling deformation in the out-of-plane direction that is likely to occur when a compressive force is applied, Since it is supported stably by being sandwiched between the receiving plate part 4 and the auxiliary stiffener 6, the occurrence of buckling can be reliably prevented. Since the brace core material 2 itself reinforced in this way can have a relatively small cross section, it can be flexibly expanded and contracted by receiving a tensile force or a compressive force due to an earthquake load, so that the seismic energy is converted into thermal energy. As a result, the vibration control effect is greatly demonstrated. Also, the welded main stiffener 5 and sub stiffener 6 are integrated to form a robust structure, and the buckling deformation of the brace core 2 is reliably suppressed, so that the seismic performance is high. Reliability is obtained.

  Moreover, the receiving plate portion 4 of the present embodiment is configured by separating the central portion in the width direction as described above. Therefore, the brace core material 2 sandwiched between the receiving plate part 4 divided into two parts and the auxiliary stiffener 6 is supported by sufficiently exhibiting the elastic force of the metal material, It is preferable in that it can absorb the seismic energy more effectively and can suppress the contact sound caused by earthquakes, traffic vibrations and the like.

  Further, the buckling restrained brace 1 reinforces the buckling strength of the brace core material 2, so that the brace core is composed of the main stiffener 5 and the auxiliary stiffener 6 without using any curable filler. Buckling reinforcement is performed by directly sandwiching the material 2. Therefore, since no parts are used other than the sandwiching member of the brace core material 2, a lightweight and functional buckling restrained brace can be obtained.

  FIGS. 7A and 7B each illustrate another embodiment of a buckling restrained brace. 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. The buckling restrained brace 1 shown in FIG. 7 (A) has a groove shape in which the main stiffener 5 can be fitted between the flanges 9 and 9 of the auxiliary stiffener 6. Then, the main stiffener 5 is fitted between the flanges 9 of the substiffener 6 so that the brace core material 2 is composed of the web 7 of the substiffener 6 and the receiving plate portion 4 formed of the web 23 of the main stiffener. In this state, the main stiffener 5 and the sub-stiffener 6 are fixed by welding the tip of the flange 9 of the sub-stiffener 6 to the outer surface of the flange 24 of the main stiffener 5. ing.

  The main stiffener 5 of the buckling-restrained brace 1 shown in FIG. 7B includes a long plate-like main plate 25 that constitutes the receiving plate portion 4, and a leg plate 26 that is in perpendicular contact with the widthwise central portion of the main plate 25. Is formed by a long material having a T-shaped cross section. The width of the main plate 25 is formed to be approximately the same as the gap between the flanges 9 of the auxiliary stiffener 6. Then, the main plate 25 of the main stiffener 5 is fitted between the flanges 9 of the sub stiffener 6 to brace the web 7 of the sub stiffener 6 and the receiving plate portion 4 comprising the main plate 25 of the main stiffener. The core material 2 is sandwiched, and in this state, both ends of the main plate 25 of the main stiffener 5 are welded to the inner surface of the flange 24 of the sub stiffener 6 so that the main stiffener 5 and the sub stiffener 6 are attached. It is stuck.

  The load-bearing frame of the present invention includes the buckling-restrained brace 1 formed as described above as a constituent member. By attaching it to a building frame, the load-bearing frame bears the horizontal strength and improves the earthquake-proof strength. As shown in FIG. 3, the load-bearing frame includes a rectangular outer peripheral frame 10 and a mounting plate 11 that projects from the inner periphery of the outer peripheral frame 10.

  The outer peripheral frame 10 is composed of an upper frame 10U and a lower frame 10D that are horizontally arranged on the upper and lower sides, and vertical eaves frames 10V and 10V that connect the left and right ends of the upper frame 10U and the lower frame 10D. 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 10V and the side end portion of the upper frame 10U are fixed by fitting the upper plate 27 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 10 </ b> V and the side end portion of the lower frame 10 </ b> D are fixed via a lower plate 28. Further, a horizontal upper mounting plate 29 is fixed to the upper end portion of the upper plate 27. Further, a horizontal lower mounting plate 22 is fixed to the lower U-shaped material 21 and the lower plate 28 provided at the lower part of the collar frame 10V. A screw hole 30 is formed in the upper mounting plate 29, and a mounting bolt 31 inserted through a beam (not shown) can be screwed into the screw hole 30 to fix the upper portion of the load bearing frame. On the other hand, an insertion hole 32 is formed in the lower mounting plate 22, and a lower part of the load-bearing frame can be fixed to a base, a beam or the like by using an attachment bolt (not shown) inserted through the insertion hole 32.

  Further, as shown in FIGS. 3 and 5, a vertically long intermediate plate 34 facing inward is welded at a substantially intermediate height position of one collar frame 10 </ b> V.

  As shown in FIG. 1, the buckling-restraining brace used for the load-bearing frame is formed long enough so that both ends of the brace core 2 protrude about 20 to 100 mm from both ends of the auxiliary stiffener 6. . Further, avoiding portions 36 cut out in a U-shape are formed at both ends of the web 7 of the auxiliary stiffener 6, and both ends of the main stiffener 5 are formed in a tapered shape with the auxiliary stiffener 6 side extended. The

  In this embodiment, a pair of buckling-restraining braces are arranged in a U-shape inside the outer peripheral frame 10, between the upper plate 27 and the intermediate plate 34, and between the intermediate plate 34 and the lower plate 28. Each is bridged between. Then, the ends of the brace core 2 are fitted and welded to the notches formed in the upper and lower plates 27 and 28 and the intermediate plate 34 in an oblique line, and both ends of the brace core 2 are fixed. is doing. Therefore, the horizontal force applied to the outer peripheral frame 10 by being attached to the building frame can be reliably supported by the brace core material 2. Furthermore, since the brace core material 2 is supported by the main stiffener 5 and the auxiliary stiffener 6 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 10 of the upper and lower plates 27 and 28 and the intermediate plate 34 constitute the mounting plate 11 for fixing the end portion of the brace core material 2. Furthermore, by avoiding the interference between the buckling restraint brace and the mounting plate 11 by the avoiding portion 36 of the auxiliary stiffener 6, and forming the end of the auxiliary stiffener 6 in a tapered shape, To prevent interference.

  The buckling-restraining brace attached to the load bearing frame shown in FIGS. 8 and 9 includes a pair of groove members 37, 37 arranged along both sides of the brace core 2, and the groove members 37, 37 from both sides. The groove member 37 and the long plate 38 are integrated by welding to the long plates 38, 38 facing each other, and as a result, the brace core material 2 is sandwiched between the groove members 37, 37. I wear it.

  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. (A) and (B) are sectional views illustrating embodiments of different buckling restraint braces. It is a perspective view of another load bearing frame. It is the principal part expansion perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Buckling restraint brace 2 Brace core material 3 Stiffening material 4 Receiving plate part 5 Main stiffening material 6 Sub stiffening material 7 Web 8 Flat plate part 9 Flange 10 Outer frame 11 Mounting plate

Claims (5)

A long plate-like brace core material that bears an axial force, and a stiffener that has substantially the same length as the brace core material and is extrapolated to the brace core material,
The stiffener includes a main stiffener having a receiving plate portion facing the brace core and a U-shaped cross-section, covering the receiving plate portion of the main stiffener and fixing the main stiffener to the main stiffener. Made of rigid material,
A buckling restrained brace characterized by suppressing buckling of the brace core material by sandwiching the brace core material between a receiving plate portion of the main stiffener material and a web of the auxiliary stiffener material. The main stiffener has a rectangular tube shape in which four flat plate portions including the receiving plate portion are continuous,
The main stiffener and the sub stiffener are made of metal, and both the flanges of the sub stiffener are welded to a pair of flat plate portions facing each other with the receiving plate portion interposed therebetween. The buckling restrained brace according to claim 1, wherein the material and the auxiliary stiffener are fixed.   The buckling restrained brace according to claim 1 or 2, wherein the receiving plate portion of the main stiffener is separated at a central portion in the width direction.   The buckling restrained brace according to any one of claims 1 to 3, wherein the brace core material is plated. A load-bearing frame using the buckling restrained brace according to any one of claims 1 to 4 as a constituent member,
It has a rectangular outer peripheral frame and a mounting plate protruding 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.

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