JP2016075037A - Buckling restraining brace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure absorption performance of vibration energy, while reducing overall weight.SOLUTION: A buckling restraining brace 10 includes an H-section steel 12 and a stiffener 14. The stiffener 14 includes a sheath tube 16 from which both edge parts of the H-section steel 12 extends at both ends, an inserted plate 18 extending along the H-section steel 12, and a filler 34 filled in a space partitioned between an outer surface of an assembly comprising the H-section steel 12 and the inserted plate 18 and an inner surface of the sheath tube 16. A non-filled space 36 is partitioned inside the assembly, where the filler 34 is not filled. Since a plasticized part A1 constituted by an intermediate part of the H-section steel 12 comprises a small cross-section part 28 having a small cross-section area, axial force borne by the bucking restraining brace 10 is reduced. Thus, a leeway is generated with regard to load bearing capacity of a non-plasticized part A0 compared to the plasticized part A1, enhancing the load bearing capacity of the overall buckling restraining brace 10 including the non-plasticized part A0 on both ends.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a buckling restrained brace.

A buckling-restrained brace is a type of damping damper, and is incorporated as a brace in a framework of a building structure and absorbs 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 are now widely used in various configurations. The buckling-restrained brace prevents the brace core material made of a steel material that is plastically deformed so as to expand and contract in response to the tensile and compressive loads in the longitudinal direction and the brace core material that has received the compressive load in the longitudinal direction from buckling. Accordingly, a buckling restraining stiffening material is provided that surrounds the intermediate portion in the longitudinal direction of the brace core material and stiffens the brace core material.
As the stiffening material, a stiffening material made of a steel material such as a steel pipe that is slidably brought into contact with the side surface or side edge of the brace core material is also used. There is also used a stiffener made of a curable filler such as concrete or mortar filled therein, in which the surface of the cured filler is brought into contact with the surface of the brace core material in an unbonded state.
Prior art documents disclosing buckling-restrained braces include, for example, a steel material as a core material, a steel pipe and a filling mortar as a stiffener, and an unbond between the core material and the filling mortar (see Patent Document 1). ).
However, the stiffener made by filling a steel pipe with mortar or the like has a disadvantage that the weight of the buckling restrained brace is increased because the filler such as mortar is heavy.
Therefore, the present applicant forms a non-filling space in which no filler is filled between a shape steel such as an H-shaped steel constituting the core material and an insertion plate extending along the shape steel, Has proposed a buckling-restrained brace that is reduced in weight by being covered with a filler over the tip part of the side edge edge part extending in the length direction and both side parts of the tip part (Patent Document 2). reference).

JP 2001-227192 A JP2013-124530A

By the way, in addition to the axial force, a bending moment is generated at the end in the longitudinal direction of the buckling-restraining brace and the joint where the buckling-restraining brace is joined to a member such as a framework of a building structure. Among them, it is necessary to increase the proof strength of the joint portion and the end portion with respect to the proof strength of the plasticized portion that undergoes plastic deformation so as to expand and contract in response to a tensile load and a compressive load in the longitudinal direction.
When the rigidity of the end portion is insufficient, the end portion of the buckling restrained brace may be broken depending on the magnitude of the tensile load and the compressive load, and the vibration energy absorption performance may be reduced.
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a buckling-restrained brace that is advantageous in securing a vibration energy absorption performance while achieving weight reduction.

In order to achieve the above-mentioned object, the invention described in claim 1 includes a brace core material made of a steel material that can be plastically deformed so as to expand and contract when a longitudinal tensile load and a compressive load are applied, and a longitudinal compressive load. In a buckling restrained brace comprising a buckling restraining stiffener that surrounds the brace core and stiffens the brace core to prevent buckling of the received brace core. The steel material constituting the brace core material has a shape in which a plurality of steel strip portions each extending in the length direction of the steel material and extending in parallel to each other are connected to each other, and A shape steel having at least two side edge edges extending in the length direction of the steel material, wherein the stiffener accommodates a longitudinal intermediate portion of the shape steel inside thereof and both end portions of the shape steel. A steel mantle tube extending from both ends thereof, and the shape An outer surface of an assembly comprising at least one insertion plate abutting against the longitudinal intermediate portion and extending along the shape steel, and the shape steel and the insertion plate abutting the shape steel And a filler having a rigidity capable of functioning as a stiffener filled in a space defined between the inner surface of the outer tube and the inner surface of the outer tube, and abutting against the shape steel and the shape steel A non-filling space in which the filler is not filled is defined inside the assembly including the insertion plate, and the side edge portion of the shape steel is seen in the cross-sectional shape of the shape steel. The side edge portion of the side edge portion and the both side portions in the vicinity of the front end portion are held by the filler of the stiffener, and the shape steel is supported at both ends in the longitudinal direction of the shape steel. A large cross-sectional area with a large cross-sectional shape and a full-length portion in the longitudinal direction of the section steel excluding the both ends. A small cross-sectional area portion having a smaller cross-sectional shape than the area portion, the small cross-sectional area portion is located at a location where the stiffener is disposed, when a longitudinal load acts on the shape steel, The portion of the section steel where the stiffener is disposed is a plasticized portion that can be plastically deformed, and both ends in the longitudinal direction of the section steel are non-plasticized portions that are less susceptible to plastic deformation than the plasticized portion. It is characterized by being.
According to a second aspect of the present invention, the full length portion of the shape steel in the longitudinal direction of the portion where the stiffener is disposed is the small cross-sectional area, and the shape steel extending from both ends of the stiffener is provided. The portion is characterized in that a portion of the shape steel near the stiffener is the small cross-sectional area, and the remaining portion of the shape steel is the large cross-sectional area.
According to a third aspect of the present invention, in the portion of the shape steel where the stiffener is disposed, both ends in the longitudinal direction are the large cross-sectional area portions, and the remaining portions excluding the both ends are the portions It has a small cross-sectional area.
The invention according to claim 4 is characterized in that the large portion of the section of the section steel is provided at the boundary between the large cross-sectional area portion and the small cross-sectional area portion of the section of the section steel where the stiffener is disposed. A cushioning material that allows displacement of the cross-sectional area to the center side in the longitudinal direction of the section steel is filled instead of the filler.
According to a fifth aspect of the present invention, the shape steel at the place where the stiffener is disposed is formed of a material that is easier to plastically deform than the both ends except for both ends in the longitudinal direction. It is characterized by.
In the invention according to claim 6, a steel reinforcing plate extending along the shape steel is joined to a portion of the shape steel that moves from the large cross-sectional area to the small cross-sectional area, In addition to the longitudinal ends of the section steel, the section of the section steel to which the reinforcing plate is joined is also the non-plasticized portion.
According to a seventh aspect of the present invention, the shape steel is selected from the class consisting of H-shape steel, cross-shape steel, I-shape steel, T-shape steel, Z-shape steel, angle steel, and groove-shape steel. It is characterized by being.
The invention according to claim 8 is characterized in that the shape steel faces the filler via an unbonded material without a part of the outer surface being covered with the insertion plate.
The invention according to claim 9 is characterized in that a part of the outer surface of the shaped steel faces the insertion plate and the filler via an unbonded material.
The invention according to claim 10 is characterized in that the filler is a material selected from the class consisting of mortar, concrete, and resin material.
The invention according to claim 11 is a brace core material made of a steel material that can be plastically deformed so as to expand and contract when a tensile load and a compressive load in the longitudinal direction are applied, and the brace core material that has received the compressive load in the longitudinal direction. A buckling-restrained brace comprising a buckling-restraining stiffening material that surrounds the brace core material and stiffens the brace core material to prevent buckling, and the steel material constituting the brace core material Has a shape in which a plurality of strip steel portions extending in the length direction of the steel material and extending in parallel to each other are connected to each other, and extending in the length direction of the steel material A steel having at least two side edge portions, and the stiffener is a steel in which a middle portion in the longitudinal direction of the steel is accommodated therein and both end portions of the steel shape extend from both ends. A sheath tube made of steel and the longitudinal intermediate portion of the section steel It can function as a stiffener filled in a space defined between the abutted backer material, the outer surface of the assembly composed of the shape steel and the backer material, and the inner surface of the outer tube. A side wall edge portion of the shape steel when viewed in a cross-sectional shape of the shape steel, and both sides in the vicinity of the tip portion. The section steel is wrapped by the filler of the stiffener, and the shape steel has a large cross-sectional area with a large cross-sectional shape at both ends in the longitudinal direction of the shape steel, and the shape excluding the both ends. A small cross-sectional area having a smaller cross-sectional shape than the large cross-sectional area at the entire length in the longitudinal direction of the steel, and the small cross-sectional area is located at a position where the stiffener is disposed, When a longitudinal load is applied to the section, the section of the section steel where the stiffener is disposed is plastically deformed. Is capable plastic moiety, both longitudinal ends of the shaped steel is characterized in that it is a non-plasticized partial without plastic deformation.

According to the first aspect of the present invention, the brace core material is made of a shape steel, the stiffener is made of an outer tube, an insertion plate, and a filler, and the shape steel constituting the brace core material and its The space between the outer surface of the assembly composed of the inner plate abutting on the shape steel and the inner surface of the outer tube is filled with the filler, while the shape steel constituting the brace core and its An unfilled space not filled with a filler is defined inside the assembly composed of an insert plate abutting against the shape steel, and the side edge of the shape steel is filled with a stiffener filling material. Therefore, the buckling restrained brace can be reduced in weight while being easily manufactured at low cost.
In addition, the intermediate part in the longitudinal direction of the section steel is a plasticized part that can be plastically deformed with a small cross-sectional area part, and both ends in the longitudinal direction of the shaped steel are large cross-sectional area parts that are less plasticized than the plasticized part. Therefore, by reducing the load axial force of the buckling-restrained brace, a margin arises in the proof stress of the nonplasticized portion relative to the plasticized portion. For this reason, the proof stress of the whole buckling restraint brace including the non-plasticizing part of both ends can be improved. Therefore, the end portion of the buckling restrained brace is not easily broken by the tensile load and the compressive load, which is advantageous in securing the absorption performance of the tensile kinetic energy.
According to the invention described in claim 2, the boundary between the small cross-sectional area portion and the large cross-sectional area portion of the shape steel is located at a location near both ends of the stiffener, and at a location spaced outward from both ends of the stiffener. Because it is located, when the shape steel shrinks, the large cross-sectional area does not interfere with the stiffener, and the buckling-restraining brace expands and contracts smoothly, ensuring vibration energy absorption performance This is advantageous.
According to the invention of claim 3, the effect of claim 1 can be achieved with a simple configuration.
According to the fourth aspect of the present invention, when the shape steel is reduced even though both ends in the longitudinal direction of the shape steel portion where the stiffener is disposed are large cross-sectional area portions, In order to secure the vibration energy absorption performance, the area part only presses the cushioning material, the large cross-sectional area part does not interfere with the stiffener, and the buckling restraint brace can be expanded and contracted smoothly. It will be advantageous.
According to the fifth aspect of the present invention, since the plasticized portion is made of a material that is more easily plastically deformed than the nonplasticized portion, it is possible to further reduce the load axial force of the buckling-restrained brace in the plasticized portion. At the same time, the proof stress of the non-plasticized portions at both ends can be further improved with respect to the plasticized portion. For this reason, it becomes more advantageous when raising the yield strength of the whole buckling restraint brace including a non-plasticizing part. Therefore, the end portion of the buckling-restrained brace is hardly broken by the tensile load and the compressive load, which is further advantageous in securing the vibration energy absorption performance.
According to the sixth aspect of the present invention, since the portion of the shape steel to which the reinforcing plate is joined in addition to the both ends in the longitudinal direction of the shape steel is also an unplasticized portion, the buckling restraint is caused by the tensile load and the compressive load. The end portion of the brace is less likely to be broken, and is therefore more advantageous in securing the absorption performance of tensile kinetic energy.
According to the seventh aspect of the present invention, since a commercially available product having easy availability can be used as the shape steel, it is advantageous in manufacturing a buckling-restrained brace simply and inexpensively.
According to the eighth aspect of the present invention, when the shape steel expands and contracts by receiving a tensile load and a compressive load in the longitudinal direction, relative sliding occurs between the shape steel and the filler, and absorption of tensile kinetic energy is achieved. This is advantageous in ensuring performance.
According to the ninth aspect of the present invention, when the structural steel expands and contracts by receiving a tensile load and a compressive load in the longitudinal direction, the relative sliding between the structural steel, the insertion plate and the filler occurs, and the tensile kinetic energy is increased. This is advantageous in securing the absorption performance.
According to the tenth aspect of the present invention, a material that is easily available can be used as the filler, which is advantageous in manufacturing a buckling-restrained brace simply and inexpensively.
According to the eleventh aspect of the present invention, the brace core material is made of a shape steel, the stiffening material is made of an outer tube, a backer material, and a filler, and the shape steel constituting the brace core material and its shape. The shape steel that forms the brace core and its shape while filling the space defined between the outer surface of the assembly composed of the backer material abutted against the steel and the inner surface of the outer tube In the assembly consisting of the backer material abutted against the steel, a part not filled with the filler is formed by the backer material, and the side edge of the shaped steel is filled with the stiffener filler. Since it is configured to be held, it is advantageous for easy production at low cost while reducing the weight of the buckling restraint brace.
In addition, the intermediate part in the longitudinal direction of the section steel is a plasticized part that can be plastically deformed with a small cross-sectional area part, and both ends in the longitudinal direction of the shaped steel are large cross-sectional area parts that are less plasticized than the plasticized part. Therefore, by reducing the load axial force of the buckling-restrained brace, a margin arises in the proof stress of the nonplasticized portion relative to the plasticized portion. For this reason, the proof stress of the whole buckling restraint brace including the non-plasticizing part of both ends can be improved. Therefore, the end portion of the buckling-restrained brace is not easily broken by the tensile load and the compressive load, which is advantageous in securing the absorption performance of the tensile kinetic energy.

It is a cross-sectional side view of the buckling restraint brace which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view along the DD line of FIG. It is a cross-sectional view along the BB line of FIG. It is a cross-sectional view along CC line of FIG. FIG. 5 is a view similar to FIG. 4 illustrating a configuration in which the joining position of the reinforcing plate is changed in the embodiment of FIG. 1. It is a longitudinal cross-sectional view of the part near the edge part of the longitudinal direction of the buckling restraint brace which concerns on the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the part near the edge part of the longitudinal direction of the buckling restraint brace which concerns on the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the part near the edge part of the longitudinal direction of the buckling restraint brace which concerns on the 4th Embodiment of this invention. It is a cross-sectional view of the buckling restraint brace which concerns on the 5th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the XX line of FIG. It is a cross-sectional view of the buckling restrained brace concerning the 5th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the YY line of FIG. It is a cross-sectional view of the buckling restraint brace which concerns on the 6th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the XX line of FIG. It is a cross-sectional view of the buckling restraint brace which concerns on the 6th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the YY line of FIG. It is a cross-sectional view of the buckling restraint brace concerning the 7th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the XX line of FIG. It is a cross-sectional view of the buckling restraint brace concerning the 7th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the YY line of FIG. It is a cross-sectional view of the buckling restraint brace concerning the 8th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the XX line of FIG. It is a cross-sectional view of the buckling restraint brace which concerns on the 8th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the YY line of FIG. It is a cross-sectional view of the buckling restrained brace concerning the 9th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the XX line of FIG. It is a cross-sectional view of the buckling restraint brace concerning the 9th Embodiment of this invention, and respond | corresponds to the cross-sectional view along the YY line of FIG. It is a cross-sectional view of the buckling restrained brace according to the tenth embodiment of the present invention, and corresponds to the cross-sectional view along the line BB in FIG. It is a cross-sectional view of the buckling restraint brace which concerns on the 10th Embodiment of this invention, and respond | corresponds to the cross-sectional view along CC line of FIG. It is a cross-sectional view of the modification of the buckling restraint brace which concerns on the 10th Embodiment of this invention, and respond | corresponds to the cross-sectional view along CC line of FIG.

(First embodiment)
1 to 5 show a buckling restrained brace 10 according to one embodiment of the present invention. This buckling restraint brace 10 is a kind of vibration damper, and is incorporated as a brace in a framework of a building structure and absorbs vibration energy when a large deformation occurs in the framework due to an earthquake or the like.

  The buckling-restrained brace 10 includes a brace core material 12. The brace core material 12 is made of an elongated steel material that can be plastically deformed so as to expand and contract when a longitudinal tensile load and a compressive load are applied. For example, various types of steel materials such as low yield point steel are used, and vibration energy is absorbed by the plastic deformation of the brace core 12. In the present invention, a steel having a constant cross-sectional shape is used as the steel constituting the brace core 12, and in the embodiment shown in FIGS. H-shaped steel is used. This H-section steel may be a built material or a roll material.

  The buckling-restrained brace 10 further includes a stiffener 14 that is longitudinal in the brace core 12 to prevent buckling of the brace core 12 that has received a longitudinal compressive load. This is a buckling-restraining stiffening material that stiffens the brace core material 12 by surrounding an intermediate portion. In the present invention, the stiffener 14 is configured to include a steel outer tube 16, at least one insertion plate 18, and a filler 34. In particular, in the embodiment shown in FIGS. 1 and 2, a round steel pipe is used as the outer tube 16, and a pair of steel plates (first insertion) having a constant cross-sectional shape as the insertion plate 18. The plate 18-1 and the second insertion plate 18-2) are used, and mortar is used as the filler 34.

  The outer tube 16 accommodates the longitudinal intermediate portion of the H-shaped steel constituting the brace core 12 inside, and both end portions of the H-shaped steel 12 extend from both ends of the outer tube 16. When the buckling-restrained brace 10 is installed in a building structure, both ends of the brace core 12 are connected to the columns and beams of the building structure via, for example, gusset plates (not shown). Then, the attachment is performed.

  The insertion plate 18 (the first insertion plate 18-1 and the second insertion plate 18-2) is in contact with the intermediate portion in the longitudinal direction of the H-shaped steel constituting the brace core 12, and this H-shaped steel. 12 extends along the longitudinal intermediate portion of the H-section steel 12.

More specifically, as shown in FIGS. 3 and 4, the H-section steel 12 is located between the first flange 20, the second flange 20, and the first flange 20 and the second flange 20 to connect them. Web 24.
As shown in FIGS. 2, 3, and 4, the first flange 20 and the second flange 20 include the wide portions 20 </ b> A and 22 </ b> A located at both ends in the longitudinal direction and the narrow portions located in the middle in the longitudinal direction. 20B and 22B, respectively.
Therefore, the H-section steel 12 is larger than the large-section area 26 with a large cross-sectional area 26 having a large cross-sectional shape at both ends in the longitudinal direction of the H-section steel 12 and the entire length in the longitudinal direction of the H-section steel 12 excluding both ends. Also has a small cross-sectional area 28 having a small cross-sectional shape.
In the present embodiment, the first flange 20 and the second flange 20 of the large cross-sectional area portion 26 have a uniform width D0, and the first flange 20 and the second flange 20 of the small cross-sectional area portion 28 have a uniform width. Width D1, and D0> D1.

In the present embodiment, the full length portion in the longitudinal direction of the H-section steel 12 where the stiffener 14 is disposed is a small cross-sectional area portion 28. Further, in the portion of the H-section steel 12 extending from both ends of the stiffener 14, the portion of the H-section steel 12 near the stiffener 14 is a small cross-sectional area 28, and the remaining portion of the H-section steel 12 is A large cross-sectional area 26 is provided.
Therefore, when a longitudinal load is applied to the H-shaped steel 12, the portion of the H-shaped steel 12 where the stiffener 14 is disposed is a plasticized portion A1 that can be plastically deformed. Both ends in the longitudinal direction are non-plasticized portions A0 that are less likely to be plastically deformed than the plasticized portions A1.
That is, the plasticized portion A1 and the nonplasticized portion A0 are formed in the shaped steel with a simple configuration.
Attachment portions 42 at both ends of the brace core member 12 respectively connected to the columns and beams of the framework of the building structure are provided in the large cross-sectional area portion 26.

  As shown in FIGS. 3 and 4, the first insertion plate 18-1 has one side edge edge portion 30 (the left side edge edge portion in the drawing) of the first flange 20 of the H-section steel 12, The second flange 20 is in contact with one side edge portion 30 (the left side edge portion in the drawing) of the second flange 20, and similarly, the second insertion plate 18-2 is the first of the H-section steel 12. Abutting against the other side edge edge portion 30 (right side edge portion in the drawing) of the flange 20 and the other side edge edge portion 30 (right side edge portion in the drawing) of the second flange 20 Yes. The insertion plate 18 (the first insertion plate 18-1 and the second insertion plate 18-2) and the first and second flanges 20, 22 of the H-shaped steel 12 are merely in contact with each other. Thus, they are not joined to each other, that is, they are unbonded to each other. Therefore, when the H-section steel 12 expands and contracts by receiving a tensile load and a compressive load in the longitudinal direction, the side edge portions 30 of the first and second flanges 20 and 22 of the H-section steel 12 and the insertion plate 18 (first Relative sliding occurs at the contact portion between the insertion plate 18-1 and the second insertion plate 18-2).

  As shown in FIGS. 1 to 4, the outer surface (outer periphery) of the assembly comprising the H-section steel constituting the brace core 12 and the pair of insertion plates 18-1 and 18-2 in contact with the H-section steel. Surface) and an inner surface (inner peripheral surface) of the outer tube 16, a space is defined, and the mortar 34 is filled in the space. The filler to be filled in this space is not limited to mortar, and various fillers having rigidity capable of functioning as a stiffener can be used. For example, concrete may be used, resin material, etc. May be used.

  The H-section steel constituting the brace core 12 is a part of the outer surface (in the illustrated example, the entire area of the outer surface (upper surface in the drawing) of the first flange 20, the (H-section steel 12 of the first flange 20). Of the left and right side edge portions 30, of the inner surface (lower surface in the drawing) of the first flange 20, the region in the vicinity of the side edge portion 30, and the outer surface (lower surface in the drawing) of the second flange 20. ), The left and right two side edge edges 30 (extending in the longitudinal direction of the H-section steel 12) of the second flange 20, and the side edge of the inner surface (upper surface in the drawing) of the second flange 20 The edge 30 vicinity region) is covered with an unbond material 32. Accordingly, in this configuration, the outer surfaces of the first and second flanges 20 and 22 that are part of the outer surface of the H-section steel 12 are not covered with the insertion plate 18 and are filled with the unbond material 32. It faces the mortar 34. Moreover, the area | region covered with the unbond material 32 which is a part of outer surface of the H-section steel 12 has faced the insertion plate 18 and the mortar 34 which is a filler through this unbond material 32.

  Examples of a method of coating a desired portion of the outer surface of the H-shaped steel 12 with the unbond material 32 include, for example, a method of sticking an unbond tape in the form of an adhesive tape to the portion, a method of applying an unbond paint to the portion, There is a method of bringing a thin steel plate into contact with the portion as an unbond material, and other methods can be used. According to the above configuration, the H-shaped steel constituting the brace core material 12 is completely unbonded with respect to the mortar 34 as the filler by the insertion plate 18 and the unbond material 32.

  Further, as apparent from FIGS. 3 and 4, the H-shaped steel constituting the brace core 12 and the insertion plate 18 (insertion plates 18-1 and 18-2) in contact with the H-shaped steel. The unfilled spaces 36-1 and 36-2 that are not filled with a filler are defined inside the assembly consisting of: H-shaped steel web constituting the brace core 12. 24 on both sides.

  Further, as is apparent from FIGS. 3 and 4, the side edge edges 30 on both sides of the first flange 20 of the H-shaped steel 12 and the side edge edges 30 on both sides of the second flange 20 are Enclosed by the mortar 34 that is a filler of the stiffener 14 over the tip portion of the side edge portion 30 when viewed in the cross-sectional shape of the H-section steel 12 and both side portions in the vicinity of the tip portion. (That is, the outer surface portion in the vicinity of the tip portion is held by the mortar 34 via the unbond material 32, and the tip portion and the inner surface portion in the vicinity of the tip portion are the unbond material 32 and the insertion plate. 18 and is held by mortar 34 through 18).

  In this way, by defining the non-filling spaces 36-1 and 36-2 in which no filler is filled in the buckling restraint brace 10, the overall weight of the buckling restraint brace 10 is reduced. A total of four side edge edges 30 of the first and second flanges 20 and 22 extending in the longitudinal direction of the H-section steel 12 are those side edge edges when viewed in the cross-sectional shape of the H-section steel 12. By being firmly held by the filler 34 of the stiffener 14 from the tip portion of the portion 30 to both side portions in the vicinity thereof, the possibility of local buckling occurring at the side edge portions 30 is eliminated. Therefore, the buckling restrained brace 10 has excellent operational reliability.

As shown in FIGS. 1 and 2, the H-section steel 12 has an H-section steel 12 at a portion of the entire length that transitions from the inside of the stiffener 14 to the outside of the stiffener 14. A plurality of steel reinforcing plates 38 extending along the same length are joined together, and the reinforcing plates 38 are not filled with the above-mentioned unfilled spaces 36-1 and 36-2 (see FIG. 4). It is arranged in.
That is, a steel reinforcing plate 38 extending along the H-section steel 12 is joined to the portion of the H-section steel 12 that moves from the large cross-section area 26 to the small cross-section area 28. In addition to the both ends in the longitudinal direction, the portion of the H-section steel 12 to which the reinforcing plate 38 is joined is also referred to as a non-plasticized portion A0.
For example, as shown in FIG. 4, the reinforcing plates 38 are disposed on both sides of the web 24 of the H-shaped steel 12 so as to be spaced apart from the web 24 and parallel to the web 24, and the first flange 20 and the second flange 20. It is good also to join so that it may connect.
Or you may make it join to the both sides | surfaces of the web 24 of the H-section steel 12, as shown in FIG.
In addition, as shown in FIGS. 1 and 2, reinforcing plates 40 are joined to the outer surfaces of the first flange 20 and the second flange 20 at both ends of the H-section steel 12. Both of the reinforcing plates 38 and 40 have sufficiently large rigidity, and therefore, the extended portions of the reinforcing plates 38 and 40 are hardly deformed plastically in the entire length of the H-shaped steel 12.

  According to this configuration, the length of the plasticized portion A1 is adjusted by appropriately setting the lengths of the reinforcing plates 38 and 40 joined to the H-section steel 12 and adjusting the length of the nonplasticized portion A0. be able to. Further, in the non-plasticized portion A0, buckling due to the longitudinal load acting on the H-shaped steel 12 is prevented by the reinforcing plates 38 and 40. Therefore, regarding the non-plasticized portion A0, the H-shaped steel 12 These reinforcing plates 38 and 40 prevent buckling deformation when a longitudinal load is applied.

  Further, the end of the stiffener 14 may be reinforced by a reinforcing material (not shown). When the reinforcing plates 38 and 40 are joined to the H-shaped steel 12 constituting the brace core material for reinforcement, the non-plasticized portion A0 of the H-shaped steel 12 formed thereby has a high rigidity. A large bending moment may act on the end of the stiffener 14 from the plasticized portion A0. Therefore, it is preferable that stress transmission from the non-plasticized portion A0 to the end of the stiffener 14 is made possible by joining a reinforcing material to the end of the stiffener 14.

  As apparent from the above, according to the buckling restrained brace 10 according to the present invention, the brace core material is constituted by the shape steel 12, the stiffener 14 is the outer tube 16, the insertion plate 18, and the filler 34. And a space defined between the outer side surface of the assembly and the inner side surface of the outer tube 16 comprising the shape steel 12 constituting the brace core and the insertion plate 18 in contact with the shape steel 12. The non-filling space 36 in which the filler 34 is not filled is filled in the assembly of the section steel 12 constituting the brace core and the insertion plate 18 in contact with the section steel 12. And the side edge 30 of the shape steel is encased by the filler 34 of the stiffener 14 so that it is lightweight and easily manufactured at low cost. The buckling restrained brace 10 which can be obtained is obtained.

Further, since the plasticized portion A1 formed of the intermediate portion of the H-section steel 12 is composed of the small cross-sectional area portion 28 in which the width of the first flange 20 and the second flange 20 is small and the cross-sectional area is small, the buckling-restraining brace. By reducing the burden axial force of 10, a margin arises in the proof stress of the nonplasticized part A0 with respect to the plasticized part A1. For this reason, the proof stress of the buckling restraint brace 10 whole including the nonplasticizing part A0 of both ends can be improved.
Therefore, the end portion of the buckling restrained brace 10 is not easily broken by the tensile load and the compressive load, which is advantageous in securing the absorption performance of the tensile kinetic energy.

  Further, in the present embodiment, a steel reinforcing plate 38 extending along the H-shaped steel 12 is joined to the portion of the H-shaped steel 12 that moves from the large cross-sectional area 26 to the small cross-sectional area 28. In addition to the both ends of the H-shaped steel 12 in the longitudinal direction, the portion of the H-shaped steel 12 to which the reinforcing plate 38 is joined is also an unplasticized portion A0. Thus, the end portion of the slab is less likely to be destroyed, and therefore, it is more advantageous in securing the absorption performance of tensile kinetic energy.

In addition, in order to ensure the proof stress of the reinforcement part of the both ends of the H-section steel 12, it is possible to join a large amount of reinforcement plates to the both ends of the H-section steel 12.
In this case, the shape of the cross section of the reinforcing portion greatly exceeds the width and height of the H-section steel 12, and it is necessary to enlarge the diameter of the outer tube 16, thereby reducing the weight of the buckling restraint brace 10. It is disadvantageous to plan. Alternatively, after inserting the H-shaped steel 12 into the outer tube 16 and assembling it, it is necessary to attach reinforcing plates to both ends of the H-shaped steel 12 exposed from both ends of the outer tube 16 by welding or the like. There is a disadvantage that causes a decrease in workability.
On the other hand, in the present embodiment, the plasticized portion A1 formed of the intermediate portion of the H-section steel 12 is configured by the small cross-sectional area portion 28 having a small cross-sectional area, so that the non-plasticized portion formed of the reinforcing portions at both ends. A0 yield strength can be secured. Therefore, it is not necessary to increase the diameter of the outer tube 16, which is advantageous in reducing the weight of the buckling restrained brace 10. In addition, the retrofitting work of the reinforcing plate is not necessary, which is advantageous in improving work efficiency.

  Further, the boundary between the small cross-sectional area portion 28 and the large cross-sectional area portion 26 of the H-section steel 12 is located at a location in the vicinity of both ends of the stiffener 14 and at a location spaced outward from both ends of the stiffener 14. Therefore, when the H-section steel 12 expands and contracts, the large cross-sectional area portion 26 does not interfere with the stiffener 14 and the expansion and contraction operation of the buckling restraint brace 10 is performed smoothly, so that vibration energy is absorbed. This is advantageous in ensuring performance.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. Note that in the following embodiments, the same parts and members as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different parts are mainly described.
In the first embodiment, the portion of the shape steel where the stiffener 14 is disposed is the small cross-sectional area 28 over the entire length, whereas in the second embodiment, the stiffener 14 The portion of the H-shaped steel 12 at the place where is disposed is the first in that both ends in the longitudinal direction are large cross-sectional area portions 26 and the remaining portion excluding both ends is a small cross-sectional area portion 28. This is different from the embodiment.
And in the location of the boundary of the large cross-sectional area part 26 and the small cross-sectional area part 28 of the H-section steel 12 part of the location where the stiffener 14 is arrange | positioned, H of the large cross-sectional area part 26 of the H-section steel part A cushioning material 44 that allows displacement of the shape steel 12 toward the center in the longitudinal direction is filled instead of the filler 34.
As the buffer material 44, various conventionally known materials such as a lightweight plastic foam material that can be easily processed can be used.
Therefore, when the H-section steel 12 is reduced in spite of the fact that both ends in the longitudinal direction of the portion of the H-section steel 12 where the stiffener 14 is disposed are large-section areas 26, the large-section area portion 26 only presses the buffer material 44, the large cross-sectional area portion 26 does not interfere with the stiffener 14, and the buckling restraint brace 10 can be smoothly expanded and contracted, so that vibration energy absorption performance is ensured. This is advantageous.

According to the second embodiment, it is needless to say that the same effects as those of the first embodiment are achieved. Compared to the first embodiment, the large cross-sectional area portion 26 of the H-section steel is shown. Is located inside both ends of the stiffener 14, it is possible to secure a larger length of the large cross-sectional area portion 26 with respect to the entire length of the H-shaped steel.
Therefore, the proof strength of the non-plasticized portion A0 at both ends can be ensured with respect to the plasticized portion A1, and it is more advantageous in increasing the proof strength of the entire buckling restrained brace 10 including the non-plasticized portions A0 at both ends. . Therefore, the end portion of the buckling restrained brace 10 is not easily broken by the tensile load and the compressive load, which is further advantageous in securing the vibration energy absorption performance.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG.
The third embodiment is a modification of the first embodiment, and the H-section steel 12 at the place where the stiffener 14 is disposed has a remaining portion excluding both ends in the longitudinal direction from both ends. Is formed of a material that is easily plastically deformed.
That is, the H-shaped steel is plastically deformed compared to the first steel material portion W1 formed of the first steel material which is located at both end portions in the longitudinal direction and is difficult to be plastically deformed, and the intermediate portion in the longitudinal direction. It is comprised by joining the 2nd steel material part W2 formed with the 2nd steel material which is easy to do.
As the first steel material, various conventionally known steel materials having high strength that are used in ordinary shape steel for constituting a structure can be used.
As the second steel material, various conventionally known steel materials including special steels such as low yield point steel materials can be used.
The steel reinforcing plate 38 is joined over the joint between the first steel material portion W1 and the second steel material portion W2.

According to the third embodiment, the plasticized portion A1 composed of the intermediate portion of the H-section steel 12 is composed of the second steel material portion W2 that is easily plastically deformed, and the nonplasticized portion composed of the reinforcing portions at both ends. A0 is composed of a first steel material portion W1 that is difficult to be plastically deformed.
For this reason, the load axial force of the buckling restrained brace 10 in the plasticized portion A1 can be further reduced, and the proof stress of the non-plasticized portions A0 at both ends can be further improved with respect to the plasticized portion A1. For this reason, it becomes more advantageous when raising the yield strength of the buckling restraint brace 10 whole including the nonplasticizing part A0 which consists of the large cross-sectional area part 26 of both ends.
Therefore, the end portion of the buckling restrained brace 10 is not easily broken by the tensile load and the compressive load, which is further advantageous in securing the vibration energy absorption performance.
In addition, although the second steel material uses special steel such as a low yield point steel material and requires a cost, the first steel material may be a steel material used for a normal shape steel. This is also advantageous in suppressing the above.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG.
In the fourth embodiment, the third embodiment is applied to the second embodiment.
That is, the portion of the H-shaped steel 12 where the stiffener 14 is disposed has both ends in the longitudinal direction as large cross-sectional area portions 26 and the remaining portion excluding both ends as small cross-sectional area portions 28. ing.
Further, the large cross-sectional area portion 26 of the H-section steel 12 portion is located at the boundary between the large cross-section area portion 26 and the small cross-sectional area portion 28 of the H-section steel portion 12 where the stiffener 14 is disposed. A buffer material 44 that allows displacement of the H-shaped steel 12 toward the center in the longitudinal direction is filled instead of the filler 34.
That is, the H-section steel 12 where the stiffeners 14 are disposed is located at both ends in the longitudinal direction and is formed in the first steel material portion W1 formed of the first steel material that is difficult to be plastically deformed, and in the middle portion in the longitudinal direction. It is configured by joining a second steel material portion W2 formed of a second steel material that is positioned and is more easily plastically deformed than the first steel material portion W1.
The steel reinforcing plate 38 is joined over the joint between the first steel material portion W1 and the second steel material portion W2.

  According to the fourth embodiment, in addition to the same effect as that of the second embodiment, the same effect as that of the third embodiment is achieved.

  Various modifications can be made to the buckling restraint brace 10 according to the first to fourth embodiments. Hereinafter, fifth to tenth embodiments will be described with reference to FIGS. 9 to 21.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS.
9 corresponds to a cross-sectional view taken along line XX in FIG. 6, and FIG. 10 corresponds to a cross-sectional view taken along line YY in FIG.
The buckling restrained brace 10 according to the fifth embodiment is a modification of the first embodiment, and uses a square steel pipe instead of a round steel pipe as the outer tube 16. This is the same as in the first embodiment.
In the fifth embodiment, the same effect as in the first embodiment can be obtained.
Of course, the second to fourth embodiments can be applied to the fifth embodiment.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIGS.
11 corresponds to a cross-sectional view taken along line XX in FIG. 6, and FIG. 12 corresponds to a cross-sectional view taken along line YY in FIG.
A buckling-restrained brace 10 according to the sixth embodiment is a modification of the first embodiment, and a grooved steel 12 is used instead of the H-shaped steel as the structural steel constituting the brace core material. The portion of the outer surface of the channel steel 12 that is not covered with the insertion plate 18 is covered with an unbond material 32. Moreover, the insertion board 18 which obstruct | occludes the opening side of the channel steel 12 is provided. A space is defined between the outer surface (outer peripheral surface) of the assembly composed of the channel steel 12 and the insertion plate 18 in contact with the channel steel, and the inner surface (inner peripheral surface) of the outer tube 16. This space is filled with a mortar 34 as a filler 34. In addition, a non-filling space 36 in which the filler 34 is not filled is defined in the assembly including the grooved steel 12 and the insertion plate 18 in contact with the grooved steel.

  Further, the channel steel 12 has two side edge edges 30 extending in the longitudinal direction of the channel steel 12, and the side edge edges 30 are formed in the cross-sectional shape of the channel steel 12. The side edge portions 30 when viewed in FIG. 2 are sandwiched by the mortar 34 that is the filler 34 of the stiffener 14 (that is, the tip). The portion on the outer surface side in the vicinity of the portion is held by the mortar 34 through the unbond material 32, and the tip portion and the portion on the inner surface side in the vicinity of the tip portion are held by the mortar 34 through the insertion plate 18. )

More specifically, the channel steel 12 has a first flange 46, a second flange 48, and a web 50 between and connecting the first flange 46 and the second flange 48.
The side edge portion 30 is formed by the tips of the first flange 46 and the second flange 48.
As shown in FIG. 12, the first flange 46 and the second flange 48 have wide portions 46A and 48A located at both ends in the longitudinal direction and a narrow width located in the middle in the longitudinal direction as shown in FIG. Parts 46B and 48B.
Therefore, the portion of the grooved steel 12 where the wide portions 46A and 48A are located is the large cross-sectional area 26, and the portion of the grooved steel 12 where the narrow portions 46B and 48B are located is small. A cross-sectional area portion 28 is provided.
In the present embodiment, the width of the first flange 46 and the second flange 48 of the large cross-sectional area portion 26 is a uniform width D0, and the width of the first flange 46 and the second flange 48 of the small cross-sectional area portion 28. Is a uniform width D1, and D0> D1.
And the large cross-sectional area part 26 is located in the location spaced apart from the both ends of the stiffener 14 outside.
Accordingly, when a longitudinal load is applied to the channel steel 12, the portion of the channel steel 12 where the stiffener 14 is disposed is a plasticized portion A1 that can be plastically deformed. Both ends in the longitudinal direction are non-plasticized portions A0 that are less likely to be plastically deformed than the plasticized portions A1.
Attachment portions (not shown) at both ends of the brace core member 12 respectively connected to the pillars and beams of the framework of the building structure are provided in the large cross-sectional area portion 26.

As shown in FIG. 12, the grooved steel 12 extends along the grooved steel 12 to a portion of the entire length that transitions from the inside of the stiffener 14 to the outside of the stiffener 14. An existing steel reinforcing plate 38 is joined, and the reinforcing plate 38 is disposed in the above-described non-filling space 36 not filled with the filler 34.
For example, as shown in FIG. 12, the reinforcing plate 38 is arranged on the side where the first flange 46 and the second flange 48 are located on the web 50 of the channel steel 12, spaced apart from the web 50 and arranged in parallel with the web 50. And the first flange 46 and the second flange 48 may be joined together.
Or you may make it join to the one side of the web 50 of the channel steel 12 similarly to FIG.
In addition, reinforcement plates 40 similar to those shown in FIGS. 1 and 2 are joined to the outer surfaces of the first flange 46 and the second flange 48 at both end portions of the channel steel 12. Both of these reinforcing plates 38 and 40 have sufficiently large rigidity.
That is, steel reinforcing plates 38 and 40 extending along the grooved steel 12 are joined to the portion of the grooved steel 12 that moves from the large cross-sectional area 26 to the small cross-sectional area 28. In addition to the two ends in the longitudinal direction, the portion of the channel steel 12 to which the reinforcing plates 38 and 40 are joined is also designated as the non-plasticized portion A0.

In this way, the grooved steel 12 has the non-plasticized portion A0 at the both ends of the full length of the grooved steel 12 that are reinforced by joining the reinforcing plates 38 and 40, and the portion between the nonplasticized portions A0. Only the intermediate portion is a plasticized portion A1 that is plastically deformed when a longitudinal load is applied to the channel steel 12.
According to this configuration, the length of the plasticized portion A1 is adjusted by appropriately setting the length of the reinforcing plates 38 and 40 to be joined to the channel steel 12 and adjusting the length of the nonplasticized portion A0. be able to. Further, the non-plasticized portion A 0 is prevented from buckling due to the longitudinal load acting on the channel steel 12 by the large cross-sectional area portion 26 and the reinforcing plates 38 and 40.

In the sixth embodiment, since only the shape of the shape steel is different from that of the first embodiment, the same effect as that of the first embodiment is exhibited.
Also, the second to fifth embodiments can be applied to the sixth embodiment, and it goes without saying that the same effects as those of the second to fifth embodiments can be obtained.

(Seventh embodiment)
Next, a seventh embodiment will be described with reference to FIGS.
13 corresponds to a cross-sectional view taken along line XX in FIG. 6, and FIG. 14 corresponds to a cross-sectional view taken along line YY in FIG.
The buckling restrained brace 10 according to the seventh embodiment is a modification of the first embodiment, and a cross-shaped steel is used instead of the H-shaped steel as the structural steel constituting the brace core 12. The four insertion plates 18-1, 18-2, 18-3, and 18-4 are in contact with the cross-shaped steel 12. Further, a steel outer tube 16 and a mortar 34 that is a filler 34 are provided, and the stiffener 14 is constituted by the insertion plate, the outer tube, and the filler 34. An outer surface (outer peripheral surface) of an assembly including the cross-shaped steel 12 and the four insertion plates 18-1, 18-2, 18-3, 18-4 in contact with the cross-shaped steel, and the outer tube 16 A space is defined between the inner side surface (inner peripheral surface) of the mortar 34 and a mortar 34 as a filler 34 is filled in the space. Further, the filling material 34 is not filled into the assembly of the cross-shaped steel 12 and the four insertion plates 18-1, 18-2, 18-3, 18-4 in contact with the cross-shaped steel. Unfilled spaces 36-1, 36-2, 36-3, and 36-4 are defined.

  Further, the cross-shaped steel 12 has four side edge edges 30 extending in the longitudinal direction of the cross-shaped steel, and these side edge edges 30 have the cross-sectional shape of the cross-shaped steel 12. When viewed, the front edge portions of the side edge portions 30 and both side portions in the vicinity of the front edge portions are held by the mortar 34 that is the filler 34 of the stiffener 14 (that is, the front end portion). Is held by a mortar 34 via an unbonded material 32, and both side portions near the tip portion are mortar via an insertion plate 18 (insertion plates 18-1, 18-2, 18-3, 18-4). 34).

More specifically, the cross-shaped steel 12 is located at the center of the first to fourth strip steel portions 52-1 to 52-4 and the first to fourth strip steel portions 52-1 to 52-4. And a connecting portion 54 that is connected.
And the side edge edge part 30 is formed of the front-end | tip of the 1st-4th steel strip part 52-1-52-4.
As shown in FIG. 14, the first to fourth steel strip portions 52-1 to 52-4 include a wide portion 52A located at both ends in the longitudinal direction and a width located in the middle in the longitudinal direction as shown in FIG. And a narrow portion 52B.
Therefore, the portion of the cross-shaped steel 12 where the wide portion 52A is located is the large cross-sectional area 26, and the portion of the cross-shaped steel 12 where the narrow portion 52B is located is the small cross-sectional area 28. It is said that.
In the present embodiment, the first to fourth strip steel portions 52-1 to 52-4 of the large cross-sectional area portion 26 have a uniform width D0, and the first to fourth strip steels of the small cross-sectional area portion 28. The widths of the portions 52-1 to 52-4 are a uniform width D1, and D0> D1.
Accordingly, when a longitudinal load is applied to the cross-shaped steel 12, the portion of the cross-shaped steel 12 where the stiffener 14 is disposed is a plasticized portion A 1 that can be plastically deformed. Both ends in the longitudinal direction are non-plasticized portions A0 that are less likely to be plastically deformed than the plasticized portions A1.
And the large cross-sectional area part 26 is located in the location spaced apart from the both ends of the stiffener 14 outside.
Attachment portions (not shown) at both ends of the brace core member 12 respectively connected to the pillars and beams of the framework of the building structure are provided in the large cross-sectional area portion 26.

Further, as shown in FIG. 14, the cross-shaped steel 12 extends along the cross-shaped steel 12 in a portion of the entire length that transitions from the inside of the stiffener 14 to the outside of the stiffener 14. An existing steel reinforcing plate 38 is joined, and the reinforcing plate 38 is disposed in the above-described non-filling space not filled with the filler 34.
For example, as shown in FIG. 14, the reinforcing plate 38 connects intermediate portions in the width direction of the adjacent steel strip portions of the first to fourth steel strip portions 52-1 to 52-4 of the cross-shaped steel 12. Thus, a total of four reinforcing plates 38 are provided along the cross-shaped steel 12.
That is, a steel reinforcing plate 38 extending along the cross-shaped steel 12 is joined to the portion of the cross-shaped steel 12 that moves from the large cross-sectional area 26 to the small cross-sectional area 28. In addition to the both ends in the longitudinal direction, the portion of the cross-shaped steel 12 to which the reinforcing plate 38 is joined is also referred to as a non-plasticized portion A0.

In this way, the cross-shaped steel 12 has a non-plasticized portion A0 at the ends of the entire length of the cruciform steel 12 that are reinforced by joining the reinforcing plate 38, and an intermediate portion between the non-plasticized portions A0. Only the plasticized portion A1 is plastically deformed when a longitudinal load is applied to the cross-shaped steel 12.
According to this configuration, the length of the plasticized portion A1 can be adjusted by appropriately setting the length of the reinforcing plate 38 joined to the cross-shaped steel 12 and adjusting the length of the nonplasticized portion A0. it can. In addition, the non-plasticized portion A0 is prevented from buckling due to the longitudinal load acting on the cross-shaped steel 12 by the reinforcing plate 38. These reinforcing plates 38 prevent buckling deformation when a directional load is applied.

Also in the seventh embodiment, since the shape of the shape steel is different from that of the first embodiment, the same effects as those of the first embodiment are achieved.
Also, the second to fifth embodiments can be applied to the seventh embodiment, and it goes without saying that the same effects as those of the second to fifth embodiments can be obtained.

(Eighth embodiment)
Next, an eighth embodiment will be described with reference to FIGS.
15 corresponds to a cross-sectional view taken along line XX in FIG. 6, and FIG. 16 corresponds to a cross-sectional view taken along line YY in FIG.
A buckling-restrained brace 10 according to the eighth embodiment is a modification of the first embodiment, and uses an angle steel instead of the H-section steel as the shape steel constituting the brace core 12. The insert plate 18 is in contact with the angle steel 12. Further, a steel outer tube 16 and a mortar 34 that is a filler 34 are provided, and the stiffener 14 is constituted by the inner insertion plate 18, the outer tube 16, and the filler 34. A space is defined between the outer surface (outer peripheral surface) of the assembly composed of the angle steel 12 and the insertion plate 18 in contact with the angle steel 12 and the inner surface (inner peripheral surface) of the outer tube 16. This space is filled with mortar 34 which is a filler 34. In addition, a non-filling space 36 in which the filler 34 is not filled is defined in the assembly composed of the angle steel 12 and the insertion plate 18 in contact with the angle steel.

  Further, the angle steel 12 has two side edge edges 30 extending in the longitudinal direction of the angle steel 12, and these side edge edges 30 are seen in the cross-sectional shape of the angle steel 12. At that time, the side edge portion 30 is surrounded by a mortar 34 that is a filler 34 of the stiffener 14 (ie, the front end portion and the front end portion). The portion on the outer surface side near the portion is held by the mortar 34 via the unbond material 32, and the portion on the inner surface side near the tip portion is held by the mortar 34 via the insertion plate 18).

More specifically, the angle steel 12 has an L-shaped cross section and is connected between the first flange 56 and the second flange 58 that are orthogonal to each other and between the first and second flanges 56 and 58. Part 60.
The side edge portion 30 is formed by the tips of the first flange 56 and the second flange 58.
As shown in FIG. 16, the first flange 56 and the second flange 58 are composed of wide portions 56A and 58A located at both ends in the longitudinal direction, and a narrow portion located in the middle of the longitudinal direction as shown in FIG. 56B, 58B.
Therefore, the portion of the angle steel 12 where the wide portions 56A and 58A are located is the large cross-sectional area 26, and the portion of the angle steel 12 where the narrow portions 56B and 58B are located is the small cross-sectional area. Part 28.
In the present embodiment, the width of the first flange 56 and the second flange 58 of the large cross-sectional area portion 26 is a uniform width D0, and the width of the first flange 56 and the second flange 58 of the small cross-sectional area portion 28. Is a uniform width D1, and D0> D1.
Therefore, when the longitudinal load is applied to the angle steel 12, the portion of the angle steel 12 where the stiffener 14 is disposed is a plasticized portion A1 that can be plastically deformed. Both ends are non-plasticized portions A0 that are less likely to be plastically deformed than the plasticized portion A1.
And the large cross-sectional area part 26 is located in the location spaced apart from the both ends of the stiffener 14 outside.
Attachment portions (not shown) at both ends of the brace core member 12 respectively connected to the pillars and beams of the framework of the building structure are provided in the large cross-sectional area portion 26.

Further, as shown in FIG. 16, the angle steel 12 extends along the angle steel 12 in a portion of the entire length that transitions from the inside of the stiffener 14 to the outside of the stiffener 14. A steel reinforcing plate 38 is joined, and the reinforcing plate 38 is disposed in the above-mentioned non-filling space not filled with the filler 34.
For example, as shown in FIG. 16, the reinforcing plate 38 is provided along the angle steel 12 by connecting intermediate portions in the width direction of the first flange 56 and the second flange 58 of the angle steel 12.
That is, a steel reinforcing plate 38 extending along the angle steel 12 is joined to the portion of the angle steel 12 that moves from the large cross-sectional area 26 to the small cross-sectional area 28, and the longitudinal direction of the angle steel 12 In addition to these two ends, the portion of the angle steel 12 to which the reinforcing plate 38 is joined is also designated as a non-plasticized portion A0.

In this way, the angle steel 12 has the non-plasticized portion A0 at the both ends of the entire length of the angle steel 12 reinforced by joining the reinforcing plate 38, and only the intermediate portion between the nonplasticized portions A0. However, it is a plasticized portion A1 that undergoes plastic deformation when a longitudinal load is applied to the angle steel 12.
According to this configuration, the length of the plasticized portion A1 can be adjusted by appropriately setting the length of the reinforcing plate 38 joined to the angle steel 12 and adjusting the length of the nonplasticized portion A0. . Further, in the non-plasticized portion A0, buckling due to the longitudinal load acting on the angle steel 12 is prevented by the reinforcing plate 38. Buckling deformation when a load is applied is prevented by these reinforcing plates 38.

Also in the eighth embodiment, since the shape of the shape steel is different from that of the first embodiment, the same effect as the first embodiment is produced.
Also, the second to fifth embodiments can be applied to the eighth embodiment, and it goes without saying that the same effects as those of the second to fifth embodiments can be obtained.

(Ninth embodiment)
Next, a ninth embodiment will be described with reference to FIGS.
17 corresponds to a cross-sectional view taken along line XX in FIG. 6, and FIG. 18 corresponds to a cross-sectional view taken along line YY in FIG.
A buckling-restraining brace 10 according to the ninth embodiment is a modification of the eighth embodiment, and includes two assemblies composed of the angle steel 12 and the insertion plate 18 shown in FIGS. 15 and 16. The other points are the same as in the eighth embodiment.
Also in the ninth embodiment, since the shape of the shape steel is different from that of the first embodiment, the same effect as the first embodiment is exhibited.
Also, the second to fifth embodiments can be applied to the ninth embodiment, and it is needless to say that the same effects as those of the second to fifth embodiments are achieved.

(Tenth embodiment)
Next, a tenth embodiment will be described with reference to FIGS.
19 corresponds to a cross-sectional view along the line BB in FIG. 1, and FIGS. 20 and 21 correspond to a cross-sectional view along the line CC in FIG.
The buckling restrained brace 10 according to the tenth embodiment is a modification of the first embodiment, and uses a backer material 62 instead of the insertion plate 18 and the non-filling space 36. The points other than are the same as in the first embodiment.
That is, as shown in FIGS. 19 and 20, a backer material 62 having the same shape as the recess is disposed in the recess surrounded by the first flange 20, the second flange 20, and the web 24 of the H-section steel. That is, the backer material 62 is arranged in place of the insertion plate 18 and the non-filling space 36 of the first embodiment.
As the backer material 62, various conventionally known materials such as a foamed plastic material having low rigidity and light weight can be used.
In FIG. 20, the reinforcing plate 38 is disposed on both sides of the web 24 of the H-shaped steel 12 so as to be spaced apart from the web 24 and parallel to the web 24, and to connect the first flange 20 and the second flange 20. FIG. 21 shows a case where the reinforcing plate 38 is joined to both side surfaces of the web 24 of the H-section steel 12. In the case of FIG. 20, an unfilled space 64 in which the backer material 62 and the filler 34 are not filled is provided between the reinforcing plate 38 and the web 24 of the H-section steel 12.
The backer material 62 is in contact with the intermediate portion in the longitudinal direction of the H-section steel 12 constituting the brace core material 12, extends along the H-section steel 12, and is also in the longitudinal intermediate portion of the H-section steel 12. It extends over.
The region covered with the unbond material 32 that is a part of the outer surface of the H-shaped steel 12 faces the mortar 34 that is the filler 34 through the unbond material 32.

The backer material 62 and the H-section steel 12 (first and second flanges 20, 22 and web 24) may be unbonded to each other, or the backer material 62 and the H-section steel 12 are joined. May be.
When the backer material 62 and the H-section steel 12 are in an unbonded state, when the H-section steel 12 expands and contracts by receiving a tensile load and a compressive load in the longitudinal direction, the H-section steel 12 and the backer material 62 Relative sliding occurs at the contact portion.
Further, when the backer material 62 and the H-section steel 12 are joined, the rigidity follows the expansion and contraction of the H-section steel 12 when the H-section steel 12 expands and contracts by receiving a tensile load and a compression load in the longitudinal direction. Therefore, the expansion and contraction of the H-section steel 12 is not affected.

  Further, the side edge portions 30 on both sides of the first flange 20 of the H-section steel 12 and the side edge edges 30 on both sides of the second flange 20 are as viewed in the cross-sectional shape of the H-section steel 12. The side edge portion 30 is surrounded by the mortar 34 that is the filler 34 of the stiffener 14 across the front end portion and both side portions in the vicinity of the front end portion (that is, the outer surface in the vicinity of the front end portion). The side portion, the tip portion, and the inner surface side portion in the vicinity of the tip portion are held by the mortar 34 through the unbond material 32).

  Thus, by arranging the backer material 62 inside the buckling restraint brace 10, the overall weight of the buckling restraint brace 10 is reduced, while the first extending in the longitudinal direction of the H-section steel 12. And the total of the four side edge portions 30 of the second flanges 20 and 22 extend from the tip portion of the side edge portion 30 to both side portions in the vicinity thereof when viewed in the cross-sectional shape of the H-section steel 12. Thus, the possibility of local buckling occurring in the side edge portions 30 is eliminated by being firmly held by the filler 34 of the stiffener 14, and the buckling restrained brace 10 is excellent. It has operational reliability.

According to the tenth embodiment, the same effect as that of the first embodiment can be obtained, and the insertion plate can be omitted and the amount of the filler 34 used can be reduced. Compared to the first embodiment, it is advantageous in reducing the weight, and using an inexpensive backer material 62 is advantageous in reducing the cost.
Further, in the second to ninth embodiments, the insertion plate is omitted and the backer material 62 is used, so that the second to ninth embodiments can also be applied to the tenth embodiment. Needless to say, the same effects as those of the second to ninth embodiments can be obtained.

As is apparent from the description of the various embodiments described above, in the present invention, various shape steels can be used as the shape steel constituting the brace core material 12.
In particular, H-shaped steel, cross-shaped steel, I-shaped steel, T-shaped steel, Z-shaped steel, angle steel, groove-shaped steel, and the like are structural steels that can be suitably used for carrying out the present invention.
More generally, in the present invention, as the structural steel constituting the brace core material, a plurality of strip steel portions each extending in the length direction of the steel material and extending in parallel to each other are used. Is a steel material having a shape in which the cross-sections are connected to each other and the transverse cross-section has a constant cross-sectional shape.
For example, H-section steel is a section steel having a shape in which three such steel strip portions are interconnected (two of which are flanges and the other one is a web).
The grooved steel is also a shaped steel having a shape in which three such steel strip-like portions are connected to each other. However, the connecting method is different from that of the H-shaped steel.
The cross-shaped steel is a shape steel having a shape in which four such steel strip portions are connected to each other, and the angle steel has a shape in which two such steel strip portions are connected to each other. Shape steel.
Furthermore, the shape steel used for constituting the brace core material in the present invention is a shape steel having at least two side edge portions 30 extending in the length direction of the steel material.
Angle steel, channel steel, Z-shape steel, etc. are shape steels having two such side edge edges 30, and T-shape steel, etc. are shapes having three such side edge edges 30. H-shaped steel, cross-shaped steel, and I-shaped steel are steel shapes having four such side edge portions 30.
In addition to the shape steels specifically listed above, there are shape steels that can be suitably used in the present invention among the shape steels having other cross-sectional shapes.

10 Buckling restraint brace 10
12, 12-1, 12-2 Brace core material 14 Stiffener 16 Outer tube 18, 18-1, 18-2, 18-3, 18-4 Inner plate 26 Large sectional area 28 Small sectional area 30 Side edge edge portion 32 Unbonded material 34 Filling material 36, 36-1, 36-2, 36-3, 36-4 Unfilled space 38 Reinforcement plate 40 Reinforcement plate 44 Buffer material 62 Backer material A1 Plasticized portion A0 Deplasticized Part W1 First steel part W2 Second steel part

Claims (11)

In order to prevent buckling of the brace core material made of a steel material that can be plastically deformed so as to expand and contract when a tensile load and a compressive load in the longitudinal direction are applied, and the brace core material that has received the compressive load in the longitudinal direction. In a buckling restrained brace comprising a buckling restraining stiffener that surrounds the brace core and stiffens the brace core,
The steel material constituting the brace core material has a shape in which a plurality of steel strip portions each extending in the length direction of the steel material and extending in parallel with each other are connected to each other, and A steel having at least two side edge edges extending in the length direction of the steel material;
The stiffener includes a steel outer tube in which a longitudinal intermediate portion of the structural steel is accommodated therein and both end portions of the structural steel extend from both ends, and the longitudinal intermediate portion of the structural steel. An outer surface of an assembly comprising at least one insertion plate abutting and extending along the shape steel, the shape steel and the insertion plate abutting against the shape steel, and an inner surface of the outer tube And a filler having a rigidity capable of functioning as a stiffener filled in a space defined between
A non-filling space in which the filler is not filled is defined in the assembly composed of the shape steel and the insertion plate in contact with the shape steel.
The side edge portion of the shape steel is formed on the stiffening member over the tip portion of the side edge edge portion and both side portions in the vicinity of the tip portion when viewed in the cross-sectional shape of the shape steel. Wrapped by the filler,
The shape steel has a large cross-sectional area with a large cross-sectional shape at both ends in the longitudinal direction of the shape steel, and a cross-sectional shape smaller than the large cross-sectional area at the entire length in the longitudinal direction of the shape steel excluding the both ends. Having a small cross-sectional area,
The small cross-sectional area is located at a location where the stiffener is disposed, and when a longitudinal load is applied to the structural steel, the portion of the structural steel where the stiffener is disposed is plastic. It is a deformable plasticized part, and both ends in the longitudinal direction of the shape steel are non-plasticized parts that are less likely to be plastically deformed than the plasticized part.
A buckling restrained brace characterized by that. The full length part in the longitudinal direction of the section steel at the place where the stiffener is arranged is the small cross-sectional area part,
The section of the section steel extending from both ends of the stiffener is the section of the section near the stiffener is the small cross-sectional area, and the remaining section of the section is the large cross-section area. It is said that
The buckling restrained brace according to claim 1. The section of the shape steel at the place where the stiffener is disposed has both ends in the longitudinal direction as the large cross-sectional area, and the remaining portion excluding the both ends serves as the small cross-sectional area. ,
The buckling restrained brace according to claim 1. At the location of the boundary between the large cross-sectional area portion and the small cross-sectional area portion of the section of the section steel where the stiffener is disposed, the shape steel of the large cross-section area portion of the section of the section steel Buffer material that allows displacement to the center side in the longitudinal direction is filled in place of the filler,
The buckling restrained brace according to claim 3. The shape steel at the place where the stiffener is disposed is formed of a material that is more easily plastically deformed than the both ends except for both ends in the longitudinal direction thereof.
The buckling restrained brace according to any one of claims 1 to 4, wherein   A steel reinforcing plate extending along the shape steel is joined to a portion of the shape steel that moves from the large cross-sectional area to the small cross-sectional area, and at both ends in the longitudinal direction of the shape steel. 6. The buckling constraining brace according to claim 1, wherein a portion of the shape steel to which the reinforcing plate is joined is also the non-plasticized portion.   The section steel is a section steel selected from the group consisting of H-section steel, cross-section steel, I-section steel, T-section steel, Z-section steel, angle steel, and channel steel. The buckling restraint brace according to any one of Items 1 to 6.   8. The shape steel according to claim 1, wherein a part of an outer surface of the shape steel faces the filler via an unbonded material without being covered with the insertion plate. 9. Buckling restraint brace.   The buckling constraining brace according to any one of claims 1 to 7, wherein a part of the outer surface of the shape steel faces the insertion plate and the filler through an unbond material. .   The buckling-restraining brace according to any one of claims 1 to 9, wherein the filler is a material selected from the group consisting of mortar, concrete, and a resin material. In order to prevent buckling of the brace core material made of a steel material that can be plastically deformed so as to expand and contract when a tensile load and a compressive load in the longitudinal direction are applied, and the brace core material that has received the compressive load in the longitudinal direction. In a buckling restrained brace comprising a buckling restraining stiffener that surrounds the brace core and stiffens the brace core,
The steel material constituting the brace core material has a shape in which a plurality of steel strip portions each extending in the length direction of the steel material and extending in parallel with each other are connected to each other, and A steel having at least two side edge edges extending in the length direction of the steel material;
The stiffener includes a steel outer tube in which a longitudinal intermediate portion of the structural steel is accommodated therein and both end portions of the structural steel extend from both ends, and the longitudinal intermediate portion of the structural steel. It can function as a stiffener filled in a space defined between the abutted backer material, the outer surface of the assembly composed of the shape steel and the backer material, and the inner surface of the outer tube. A filler having rigidity,
The side edge portion of the shape steel is formed on the stiffening member over the tip portion of the side edge edge portion and both side portions in the vicinity of the tip portion when viewed in the cross-sectional shape of the shape steel. Wrapped by the filler,
The shape steel has a large cross-sectional area with a large cross-sectional shape at both ends in the longitudinal direction of the shape steel, and a cross-sectional shape smaller than the large cross-sectional area at the entire length in the longitudinal direction of the shape steel excluding the both ends. Having a small cross-sectional area,
The small cross-sectional area is located at a location where the stiffener is disposed, and when a longitudinal load is applied to the structural steel, the portion of the structural steel where the stiffener is disposed is plastic. It is a deformable plasticized part, and both ends in the longitudinal direction of the shape steel are non-plasticized parts that do not undergo plastic deformation,
A buckling restrained brace characterized by that.

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