JP5285451B2 - Buckling-restrained brace and load-bearing frame using the same - Google Patents

Description

  The present invention suppresses the deformation of the building due to the horizontal force by spanning inside the vertical surface such as the wall of the building and the horizontal surface such as the floor, and also prevents the vibration of the building during the earthquake. The present invention relates to a buckling-restrained brace useful for early damping and a load-bearing frame using the same.

  Conventional buckling-restrained braces are made by inserting a brace core material using a low yield point steel or the like inside a stiffener material using a steel pipe or the like, and in the gap between the brace core material and the stiffener material, Many structures filled with a curable material such as a synthetic resin are employed.

  In the buckling restrained brace configured in this way, the buckling of the brace core material that occurs when receiving a compressive load is restrained by the bending rigidity of the stiffener. Therefore, the brace core material having a relatively small cross section can sufficiently resist both the tensile force and the compressive force, and can obtain the reinforcing effect necessary for the brace. Further, when a large horizontal force is generated in a building such as when an earthquake occurs, the brace core material having a small cross section can convert these external forces into plastic deformation energy and effectively suppress vibration response (for example, Patent Document 1). To 4).

Japanese Patent Laid-Open No. 2005-220637 JP 2008-75280 A JP 2008-75281 A JP 2008-255654 A

  However, in order to reliably transmit the force that the brace core material buckles to the stiffener, it is necessary to fill the curable material such as mortar with no gap. Further, in order to allow the brace core material to freely expand and contract, it is necessary to treat the brace core material and the filler with an insulating material or the like. For this reason, the conventional buckling restrained brace requires a high level of manufacturing technology and quality control, and has a problem that the manufacturing cost is high. For this reason, the conventional buckling-restrained brace is limited to the use of high-rise buildings and the like, and there is a problem that it is difficult to adopt it for ordinary houses.

  Moreover, when adjusting the proof stress of a buckling restraint brace, changing the thickness and width dimension of a brace core material is also considered. However, if the thickness of the brace core is made too thin, local buckling becomes prominent and there is a risk that sufficient resistance to compressive load will not be exhibited. Further, when the thickness of the brace core material changes, it is necessary to prepare a restraint material or the like for restraining the brace core material for each brace core material. Such a method has a problem that it lacks versatility and causes an increase in manufacturing cost.

  The present invention has been devised in view of the above problems, a buckling-restrained brace that can be manufactured at low cost without degrading quality, and that can easily adjust rigidity or proof stress, and the same. It is an issue to provide a load-bearing frame using the.

  The invention according to claim 1 of the present invention is a buckling-restrained brace that suppresses deformation of a building, and is a long plate-shaped brace core material that bears an axial force, and a longitudinal direction of the brace core material. On one end side, a first stiffener made of a pair of groove steels welded to both side surfaces of the brace core material with the groove portion facing the plate surface of the brace core material, and the longitudinal direction of the brace core material A second end made of a pair of groove-type steels welded to both side surfaces of the brace core material with the groove portions facing the plate surface of the brace core material and spaced apart from the first stiffener. And at least a third stiffener for inserting the first stiffener and the second stiffener together and preventing relative bending of both stiffeners, and The brace core material has at least one rigidity adjusting hole penetrating in the thickness direction. .

  The invention according to claim 2 is the buckling restrained brace according to claim 1, wherein the hole is circular.

  According to a third aspect of the present invention, the first stiffener and the second stiffener have attachment end portions that extend beyond both ends of the brace core material, respectively. This is a buckling restrained brace.

  According to a fourth aspect of the present invention, the attachment end portion is formed by a portion where the pair of groove steel faces each other with a gap equal to the thickness of the brace core material. It is.

  The invention according to claim 5 is the buckling according to any one of claims 1 to 4, wherein the third stiffener has an inspection hole for inspecting a welded portion between the brace core material and the channel steel. Restraint brace.

  The invention according to claim 6 is the following: a space surrounded by the first stiffener and the brace core on both sides of the brace core; a space surrounded by the second stiffener and the brace core; The buckling-restrained brace according to any one of claims 1 to 5, further comprising a fourth stiffener extending continuously between the first and second bracing members in the longitudinal direction of the brace core material.

  A seventh aspect of the present invention is a load-bearing frame using the buckling restrained brace according to any one of the first to sixth aspects as an oblique member.

  The invention according to claim 8 includes a rectangular outer peripheral frame, a corner plate that is arranged at a corner portion of the outer peripheral frame and projects inward, and a mounting plate that projects inward from the frame material of the outer peripheral frame, The buckling-restraining brace is a load-bearing frame according to claim 7, wherein attachment ends at both ends thereof are welded to the corner plate and the attachment plate without bringing the brace core material into contact with the corner plate and the attachment plate, respectively.

The invention according to claim 9 is the load-bearing frame according to claim 7 or 8 , wherein only the one end side of the third stiffener is fixed to the corner plate or the mounting plate.

  The buckling-restraining brace of the present invention includes a long plate-shaped brace core material that bears an axial force, and first and second spaced apart from each other that are welded to one end and the other end side in the longitudinal direction of the brace core material. The first stiffener and the second stiffener are inserted together, and the third stiffener is used to prevent relative bending of both stiffeners. Therefore, the buckling-restrained brace of the present invention can effectively suppress the large buckling of the brace core material only with the stiffener, and as a result, the reinforcing effect necessary for the brace by sufficiently resisting both the tensile force and the compressive force. Can be manufactured at low cost. Therefore, it can be widely used in industrialized houses and the like, and versatility can be improved.

  The brace core material has at least one rigidity adjusting hole that penetrates in the thickness direction. Therefore, the buckling-restrained brace of the present invention can adjust the strength of the brace core material without changing the thickness or material of the brace core material, so that the dimensions of the restraint material (stiffener) that restrains the brace core material can be changed. There is no need, and excellent versatility and cost reduction can be realized.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 is an overall perspective view of a buckling-restraining brace 1, FIG. 2 is an AA end view of FIG. 1, FIG. 3 is a BB end view of FIG. 1, and FIG. 4 is a CC end view of FIG. Is shown respectively.

  The buckling restrained brace 1 of the present embodiment includes a brace core material 2 that bears axial forces in both the tensile and compression directions acting in the longitudinal direction, and a first welded to one end side S1 of the brace core material 2 in the longitudinal direction. The stiffener 3, the second stiffener 4 welded to the other end S 2 of the brace core 2, and the first stiffener 3 and the second stiffener 4 are inserted together. And at least a third stiffener 5 that prevents relative bending of both stiffeners 3 and 4.

  For the brace core material 2, for example, various steel materials such as carbon steel, stainless steel, or alloy steel can be used, but extremely low yield point steel is preferable. Extremely low yield point steel has a yield point of about ¼ to ３ as compared to general steel (for example, SM490 and SS400), but can exhibit very excellent performance with respect to elongation of 50% or more. Further, the brace core material 2 may have a surface plated to reduce friction with the first to second stiffeners 3 to 4.

  The brace core material 2 has a long plate shape with a rectangular cross section, and as an example, the brace core material 2 has a width W of about 20 to 100 mm, for example, and a thickness t of about 3 to 15 mm. Moreover, the length dimension etc. of the brace core material 2 should just be suitably set according to the span length to which the brace core material 2 is attached.

  Furthermore, the brace core material 2 is formed with at least one hole 8 for adjusting rigidity in the present embodiment, which penetrates in the thickness direction. The hole 8 of the present embodiment is circular, but may be oval or oval. Further, the hole 8 is provided at the center of the width W of the brace core material 2 in order to ensure the symmetry of the brace core material 2. In this embodiment, the holes 8 are provided on the center line of the width W of the brace core member 2 so that the centers are aligned and substantially at the same pitch.

  Such a hole 8 can adjust the proof stress of the brace core material 2 without changing the thickness t or material of the brace core material 2. That is, by increasing the number and / or inner diameter of the holes 8, the proof strength of the brace core material 2 can be reduced and deformed at an early stage. Conversely, by reducing the number and / or inner diameter of the holes 8, the proof strength of the brace core material 2 can be relatively improved and the deformation can be delayed. Therefore, the number of holes 8 or the inner diameter can be determined based on the load applied to the building or structure to be used, and the optimum rigidity of the brace core material 2 can be given.

  The inner diameter d of the hole 8 can be arbitrarily determined depending on the material and thickness of the brace core material 2. Therefore, although not particularly limited, when the inner diameter d of the hole 8 becomes excessively large, the yield strength of the brace core material 2 may be significantly reduced. From such a viewpoint, the inner diameter d of the hole 8 is preferably 33% or less, more preferably 25% or less of the width W of the brace core material 2.

  In FIG. 5, several embodiments of the brace core 2 are shown. FIGS. 5A and 5B show examples in which the inner diameter and pitch of the holes 8 are varied. FIG. 5C shows an example in which the holes 8 are formed in a staggered manner on both sides of the center line CL of the width W of the brace core material 2. Thus, the hole 8 can be formed in various forms.

  The first stiffener 3 is composed of a pair of channel steels 6 welded to both side surfaces of the brace core 2 on one end side S1 in the longitudinal direction of the brace core 2. Each groove steel 6 has a web 6a and a pair of flange portions 6b, 6b extending from both ends thereof, and the groove 6w is formed on the plate surface 2P of the brace core 2 (a surface perpendicular to the direction of the thickness t). It is arranged towards. More specifically, the grooved steel 6 is fixed by welding so that the brace core 2 is sandwiched from above and below in a state where the end surfaces 6be of the flange portions 6b on both sides are in contact with the plate surface 2P of the brace core 2. . In addition, the width of the grooved steel 6 is smaller than the width W of the brace core material 2, thereby forming corner-shaped corner portions that can be welded to both outer sides of the flange portion 6b.

  FIG. 6 shows a side view of the third stiffener 5 of the buckling restrained brace 1 cut along a longitudinal section. In FIG. 6, a welded portion (weld bead) is indicated by a symbol J. As is apparent from the figure, the brace core material 2 and the groove steel 6 of the first and second stiffeners 3 to 4 are welded to a predetermined length and intermittently. Further, the welded portion Ja on the most other end side S <b> 2 of the first stiffener 3 is provided at a position reserved from the inner edge 6 s of the grooved steel 6 to the one end side S <b> 1.

  The first stiffener 3 as described above can suppress buckling of the brace core material 2 within the stiffening range by sandwiching the brace core material 2 from above and below with the grooved steel 6.

  Further, the second stiffener 4 is a pair of grooves welded to both side surfaces of the brace core 2 on the other end S2 in the longitudinal direction of the brace core 2 in the same manner as the first stiffener 3. It consists of a mold steel 6. The grooved steel 6 is the same as that of the first stiffener 3, and the brace core 2 is formed with the end surfaces 6 be of the flange portions 6 b on both sides in contact with the plate surface 2 </ b> P of the brace core 2. It is fixed by welding. Accordingly, the second stiffener 4 also has the brace core 2 sandwiched from above and below by the grooved steel 6 in the same manner as the first stiffener 3, so that the brace core 2 can buckle within the stiffening range. Can be suppressed.

  Further, as shown in FIG. 6, the second stiffener 4 is provided to be separated from the first stiffener 3 in the longitudinal direction. When the first stiffener 3 and the second stiffener 4 are abutted against each other, the first to second stiffeners 3, 4 are not the brace core 2 but the axial force when the compressive force is applied. Can not be adopted because it burdens. In other words, relatively large plastic deformation (extension or local seating) of the brace core 2 is limited to the separated portion U where the first stiffener 3 and the second stiffener 4 of the brace core 2 are separated from each other. Bend).

  Further, the welded portion Jb on the most end side S1 of the second stiffener 4 is provided at a position reserved from the inner edge 6s of the grooved steel 6 to the other end side S2. That is, in the region K between the welded portion Ja of the first stiffener 3 and the welded portion Jb of the second stiffener 4, the brace core material 2 and each of the stiffeners 3 to 4 are in contact with each other. In this region K, since the brace core 2 is deformed (expanded / contracted), relative movement between the brace core 2 and the stiffener 3 or 4 of the grooved steel 6 is possible because it is in contact and not fixed. is there.

  The hole 8 of the brace core material 2 is provided in this region K. In the brace core material 2, the outer side than the region K is substantially rigidized by the first or second stiffeners 3, 4, so that even if the holes 8 are formed, a substantial decrease in yield strength occurs. Because there is no.

  Moreover, in this embodiment, the 1st stiffener 3 and the 2nd stiffener 4 have extended beyond the both ends 2E of the brace core material 2, respectively. This part is suitably used as the attachment end 7 attached to the building or structure side. The attachment end portion 7 of the present embodiment is formed as a portion where the pair of groove steels 6, 6 facing the groove 6 w face each other with a gap 9 equal to the thickness t of the brace core 2.

  The third stiffener 5 is formed in a rectangular tube shape into which both the first stiffener 3 and the second stiffener 4 are inserted. That is, the third stiffener 5 has an upper surface that is substantially parallel to the web 6a of the channel steel 6, a lower surface 5a, and left and right side surfaces 5b that connect the lower surface 5a.

Further, as shown in FIG. 6, the third stiffener 5 has a length larger than that of the brace core 2, and the first stiffener 3 and the second stiffener 4 It stretches over. Further, as shown in FIGS. 2 to 4, the third stiffener 5 is formed between the outer surfaces of the webs 6a and 6a of the respective channel steel 6 of the first stiffener 3 or the second stiffener 4. The rectangular cross section is slightly larger than the height T and the width W of the brace core 2. Therefore, the relative bending displacement between the first stiffener 3 and the second stiffener 4 can be restricted to a very small range.

  As shown in FIGS. 1 and 4, the third stiffener 5 is provided with an inspection hole 10 through which a welded portion J between the brace core material 2 and the channel steel 6 can be inspected. Normally, when the buckling restrained brace 1 is finished as a finished product, the inside of the stiffener cannot be confirmed or inspected. However, as in the present embodiment, the buckling-restrained brace 1 is structured by providing the third stiffener 5 with an inspection hole 10 through which a welded portion between the brace core material 2 and the channel steel 6 can be visually recognized. At the time of construction to be incorporated into the body, it is possible to inspect and confirm the quality of the welded portion J between the brace core material 2 and the channel steel 6 again. The inspection hole 10 of the present embodiment is formed by a rectangular opening provided on the side surface 5b of the third stiffener 5, but an oval or elliptical shape can be used as long as the weld J can be visually recognized. It may be in the shape.

  For each of the stiffeners 3, 4 and 5, steel materials including carbon steel, stainless steel, and alloy steel are preferably used. In order to reliably prevent the brace core material 2 from buckling, a brace core is used. A metal material having higher elasticity than the material 2 is preferably used.

  Further, the buckling restrained brace 1 of the present embodiment does not use any curable filler for suppressing the buckling of the brace core material 2 and does not use any of the above-mentioned steel stiffeners. The material 2 is buckled and reinforced. Therefore, the buckling-restrained brace 1 of the present embodiment does not require other parts other than the restraining material (steel material) of the brace core material 2, and can be manufactured inexpensively and easily. Therefore, the buckling restrained brace 1 of the present embodiment can be widely used in industrialized houses and the like, and can improve versatility.

  As shown in FIG. 1, the buckling-restraining brace 1 configured as described above includes a mounting end 7 of the first stiffener 3 and a mounting end 7 of the second stiffener 4. Used by being fixed to the body side plates P1, P2, etc. Since the attachment end 7 has a gap 9, it can be temporarily held or positioned by inserting the gap 9 into the plates P1 and P2. Further, the attachment end portion 7 and the plate P1 or P2 can be easily fixed by simple welding such as fillet welding, for example. This is useful for improving the workability of the buckling restrained brace 1. However, it may be joined with a bolt or the like. The third stiffener 5 has only one end fixed to the plate P1 or P2 and the other end not fixed to the plate P1 or P2 to be free to prevent rattling or the like. .

  For example, when a compressive force acts between the plates P <b> 1 and P <b> 2, the compressive force is transmitted to the brace core member 2 through the first stiffener 3 and the second stiffener 4. That is, the axial force is borne by the brace core material 2. However, since the first stiffener 3 and the second stiffener 4 are constrained by the third stiffener 5, they are substantially free from relative bending displacement. Therefore, the brace core material 2 has high compression resistance by being contracted by compression deformation in the above-described region K, particularly in the separated portion U between the first stiffener 3 and the second stiffener 4 of the brace core material 2. Indicates. When the compressive force does not exceed the yield point of the brace core material 2, the brace core material 2 is restored to its original shape at the time of unloading.

  On the other hand, when a large compressive force exceeding the yield point of the brace core material 2 is applied due to an earthquake or the like, the brace core material 2 locally compressively plastically deforms at the separated portion U as shown in FIG. Absorbs compression energy. This is particularly useful for early damping of vibrations.

  As described above, the buckling restrained brace 1 of the present embodiment can suppress the deformation of the building or the structure with respect to the horizontal force, and can realize the early attenuation of the vibration of the building during an earthquake.

  In addition, the expansion-contraction amount (displacement amount) of the brace core material 2 can be adjusted by adjusting the length of the said space | interval part U and / or the distance of the longitudinal direction of the area | region K between welding part Ja-Jb. For example, when the buckling restrained brace 1 of the present embodiment is used in a place where a compressive strain is assumed to be large, it is desirable to ensure a sufficiently large distance in the region K between the welded portions Ja and Jb. Thereby, the strain (rate) of the brace core material 2 can be reduced, and the compression plastic deformation of the brace core material 2 can be delayed.

  Although not particularly limited, the length a of the separation portion U is 1% or more of the total length L of the brace core material 2, more preferably 1.5% or more, and preferably 3% or less. More preferably, it is 2% or less. Similarly, the distance b in the longitudinal direction of the region K between the welds Ja-Jb is preferably 20% or more, more preferably 25% or more of the total length L of the brace core 2, and preferably 65% or less. More preferably, 60% or less is desirable.

  FIG. 8 shows another embodiment of the buckling restrained brace 1. Further, FIG. 9 shows a CC end view of FIG.

  The buckling-restrained brace 1 of this embodiment includes a space surrounded by the first stiffener 3 and the brace core 2, a second stiffener 4, and the brace core on both sides of the brace core 2. 4 further includes a fourth stiffener 11 extending continuously between the space surrounded by the two. The configuration of the other parts is basically the same as in the above embodiment.

  In this embodiment, the fourth stiffener 11 is made of channel steel 12, and the web 12a is arranged facing the plate surface 2P side of the brace core 2. Further, the grooved steel 12 is accommodated with a gap such that the end portion 12be of the flange portion 12b substantially contacts or slightly separates the inner surface of the web of the grooved steel 6. The buckling restrained brace 1 having such a fourth stiffener 11 can more surely prevent local buckling of the brace core 2 at the separated portion U and exhibit very high compression resistance. it can. For this reason, in the buckling restraint brace 1 of this embodiment, it is possible to exert equivalent performance using the brace core material 2 having a thickness t smaller than that of the above embodiment.

  10 to 12 show a load bearing frame 20 in which the buckling restrained brace 1 of the present embodiment is used as an oblique material.

As shown in FIG. 10, the load-bearing frame 20 is composed of a rectangular outer peripheral frame 21, a corner plate 22 arranged at a corner portion of the outer peripheral frame 21 and projecting inward, and a frame member 21 V of the outer peripheral frame 21. And a mounting plate 23 projecting inward.

  The outer peripheral frame 21 according to the present embodiment is a horizontally disposed upper and lower frame member 21U, 21D, and a frame of a kite that extends vertically between the left and right ends of the upper and lower frame members 21U, 21D. It is comprised by the vertically long rectangular shape containing the materials 21V and 21V. Each adjacent frame member is formed with a slit, and a plate-like corner plate 22 is inserted therein and integrally joined by welding.

As shown in FIG. 10, the corner plate 22 fixed to the upper frame member 21U protrudes from the upper portion, and allows a mounting bolt or the like inserted through a beam (not shown) or the like to be inserted. A hole 30 is formed. The corner plate 22 fixed to the lower frame member 21D is provided with a mounting base 31 and the like that can fix the lower part of the load-bearing frame to a base or a beam.

  Further, the mounting plate 23 is fixed to a substantially middle portion of the frame material 21V of one of the collars.

  Further, as shown in FIGS. 11 and 12, the buckling restrained brace 1 has a corner plate 22 and a mounting plate 23 inserted into a gap 9 between mounting ends 7 at both ends thereof, and an outer peripheral frame by a fillet welded portion Jc. Incorporated obliquely within 21. This fixing is performed without bringing the brace core material 2 into contact with either the corner plate 22 or the mounting plate 23. Moreover, although the buckling restraint brace 1 of this embodiment is incorporated in a “<” shape with respect to the outer peripheral frame 21, its form can be arbitrarily changed. Note that a U-shaped notch 25 is formed at both ends of the third stiffener 5 to prevent interference with the plates 22 and 23. However, as described above, only the one end side of the third stiffener 5 is welded to the plate 22 or 23.

  By attaching such a load-bearing frame 20 to a building frame (for example, between the upper and lower beams of a house), it is possible to bear the horizontal load and greatly improve the earthquake-proof strength.

  The preferred embodiment of the present invention has been described in detail above. However, the present invention is not limited to the above-described embodiment, and needless to say, various modifications can be made without departing from the gist of the present invention. .

  FIG. 13 shows a deformation history when the horizontal tensile / compressive load is repeatedly applied to the proof frame of FIG. FIG. 13A shows a load-bearing frame using the buckling-restrained brace (t = 4.5 mm, the number of holes, 10 holes, an inner diameter of 13 mm, a hole pitch of 35 mm), and FIG. 13B shows holes. It is an experimental result of the load-bearing frame using the buckling restraint brace (t = 4.5mm) which is not provided.

  As is clear from these experimental results, it can be confirmed that the buckling restrained brace of the present embodiment exhibits symmetrical deformation in both tension and compression.

It is a perspective view which shows one Embodiment of the buckling restraint brace of this invention. It is the AA end elevation. It is the BB end elevation. It is the CC end elevation. (A) to (c) is a plan view showing an embodiment of a brace core material. It is a side view (partial cross section) of FIG. It is an enlarged side view which shows the state where the brace core material buckled locally. It is a perspective view of the buckling restraint brace which shows other embodiment of this invention. It is the DD end elevation. It is a perspective view of a load-bearing frame using the buckling restrained brace of this embodiment. It is the principal part enlarged view. (A) And (b) is a principal part enlarged view of FIG. (A) And (b) is a graph which shows the deformation | transformation log | history of a yield strength frame using a buckling restraint brace.

DESCRIPTION OF SYMBOLS 1 Buckling restraint brace 2 Brace core material 3 1st stiffening material 4 2nd stiffening material 5 3rd stiffening material 6 Channel steel 6a Web 6b Flange part 7 Attachment end part 8 Hole 10 for rigidity adjustment Inspection Hole 11 Fourth stiffener 12 Channel steel 12a Web 12b Flange 20 Strength bearing frame 21 Outer frame 22 Corner plate 23 Mounting plate U Spacing part of brace core

Claims (9)

A buckling restraint brace that suppresses deformation of the building,
A long plate-shaped brace core that bears axial force;
A first stiffener made of a pair of grooved steel welded to both side surfaces of the brace core material, with one end side in the longitudinal direction of the brace core material facing the plate surface of the brace core material;
At the other end in the longitudinal direction of the brace core material, a groove is welded to both side surfaces of the brace core material with the groove surface facing the plate surface of the brace core material, and is provided apart from the first stiffener. A second stiffener made of a pair of channel steels;
A first stiffener and a second stiffener are inserted together and at least a third stiffener that prevents relative bending of both stiffeners; and
The said brace core material has at least 1 hole for rigidity adjustment penetrated in the thickness direction, The buckling restraint brace characterized by the above-mentioned.   The buckling restraint brace according to claim 1, wherein the hole is circular.   The buckling-restraining brace according to claim 1 or 2, wherein the first stiffener and the second stiffener have attachment end portions that extend beyond both end portions of the brace core material, respectively.   The buckling-restraining brace according to claim 3, wherein the attachment end portion is formed by a portion where the pair of groove steels face each other with a gap equal to the thickness of the brace core material.   5. The buckling-restrained brace according to claim 1, wherein the third stiffener has an inspection hole through which a welded portion between the brace core material and the channel steel can be inspected.   A longitudinal direction of the brace core material between a space surrounded by the first stiffener and the brace core material and a space surrounded by the second stiffener material and the brace core material on both side surfaces of the brace core material The buckling-restraining brace according to any one of claims 1 to 5, further comprising a fourth stiffener extending continuously.   A buckling frame comprising the buckling restrained brace according to any one of claims 1 to 6 as an oblique member. Including a rectangular outer peripheral frame, a corner plate that is arranged at a corner portion of the outer peripheral frame and projects inward, and a mounting plate that projects inward from the frame material of the outer peripheral frame;
The load-bearing frame according to claim 7, wherein the buckling-restraining brace is welded to the corner plate and the mounting plate at both ends without bringing the brace core material into contact with the corner plate and the mounting plate. The load-bearing frame according to claim 7 or 8 , wherein only the one end side of the third stiffener is fixed to the corner plate or the mounting plate.

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