JP5805430B2 - Buckling restraint brace - Google Patents

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 a longitudinal tensile load and a compressive load, and the brace core material that has received the longitudinal compressive load 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, Patent Document 1 and Patent Document 2 shown below.

JP2007-291704A JP 2008-002133 A

  A stiffener made of steel tube filled with mortar, etc. has good buckling restraint performance, and has the advantage of being able to absorb brace core material and / or steel pipe dimensional errors with the filler. However, since the filler such as mortar is heavy, there is a disadvantage that the weight of the buckling restrained brace is increased. On the other hand, the stiffener made of a steel pipe that is slidably abutted against the side or side edge of the brace core is lightweight, but the gap between the brace core and the stiffener is several mm or less. Therefore, there is a problem that the manufacturing cost is increased and the manufacturing cost increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a buckling-restrained brace that is lightweight and can be easily manufactured at low cost.

A buckling-restrained brace according to the present invention 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 the brace core that has received a longitudinal compressive load. A buckling-restrained brace comprising a buckling-restraining stiffener that surrounds the brace core and stiffens the brace core to prevent the material from buckling. (A) The brace core (B) The stiffener accommodates a longitudinal intermediate portion of the shape steel therein, and both end portions of the shape steel extend from both ends thereof. A steel outer tube that extends, at least one insertion plate that abuts against the longitudinal intermediate portion of the shape steel and extends along the shape steel, and abuts the shape steel and the shape steel The outer surface of the assembly comprising the inserted insertion plate and the outer tube And a filler having a rigidity capable of functioning as a stiffener filled in a space defined between the inner surface and (C) the shape steel and the inner surface in contact with the shape steel A non-filling space in which the filler is not filled is defined inside the assembly including an insertion plate, and (D) a part of the outer surface of the shaped steel is inserted through the unbonded material. It faces the plate and the filler .

  A steel reinforcing plate extending along the shape steel is joined to a portion of the total length of the shape steel that transitions from the inside of the stiffener to the outside of the stiffener, thereby The portion may be a non-plasticized portion that does not undergo plastic deformation even when a longitudinal load is applied to the shape steel. Further, the length of the non-plasticized portion of the overall length of the shape steel is adjusted, so that the portion of the overall length of the shape steel that undergoes plastic deformation when a longitudinal load is applied to the shape steel. It is preferable to adjust the length of the plasticized portion. Further, it is preferable that at least a part of the reinforcing plate is located in the non-filling space.

  The shape steel may be a shape steel selected from the group consisting of H-shape steel, I-shape steel, T-shape steel, Z-shape steel, angle steel, and groove-shape steel.

  Further, the shape steel is H-shaped steel, and the at least one insertion plate has a U-shaped cross section in contact with one edge of one flange of the H-shape steel and one edge of the other flange. A first insertion plate, and a second insertion plate having a U-shaped cross section contacting the other edge of one flange of the H-shaped steel and the other edge of the other flange. The non-filling space may be defined on both sides of the H-shaped steel web by the second insertion plate. In addition, a reinforcing material is joined to the end of the stiffener, thereby enabling stress transmission from the non-plasticized portion of the overall length of the section steel to the end of the stiffener. Good.

  According to the buckling-restrained brace according to the present invention, the brace core material is composed of a shape steel, the stiffener material is composed of an outer tube, an insertion plate, and a filler, and the brace core material is composed. The space defined between the outer surface of the assembly composed of the shape steel and the inner plate abutting on the shape steel and the inner surface of the outer tube is filled with the filler, while forming the brace core. An unfilled space that is not filled with a filler material is defined inside the assembly consisting of a section steel and an insertion plate that abuts the section steel, so that it is light weight and easy at low cost. A buckling-restrained brace that can be manufactured is obtained.

(A) is a cross-sectional side view of a buckling restrained brace according to an embodiment of the present invention, (B) is a cross-sectional view taken along line BB in (A), and (C) is C in (A). It is a cross-sectional view along line -C. It is the figure which showed the buckling restraint brace which concerns on the example of a change of the buckling restraint brace of FIG. 1, (A) and (B) are the cross-sectional views corresponding to (B) and (C) of FIG. 1, respectively. It is. (A) And (B) is the figure which showed the specific example of the reinforcing material which can be provided in the edge part of the stiffener of a buckling restraint brace. (A) And (B) is a cross-sectional view of the buckling restraint brace which concerns on the various modification of the buckling restraint brace of FIG. (A)-(D) is a cross-sectional view of a buckling restrained brace according to various modifications of the buckling restrained brace of FIG.

  1A to 1C show a buckling restrained brace 10 according to an 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 composition deformation of the brace core material 12. In the present invention, a shape steel having a constant cross section is used as the steel material constituting the brace core material 12, and in the embodiment shown in FIG. 1, an H shape steel is used as the shape steel. Yes. 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 20. In particular, in the embodiment shown in FIG. 1, a round steel pipe is used as the outer tube 16, and a pair of U-shaped steel plates (first insertion plate 18-1 and second insertion plate 18) are used as the insertion plate 18. Plate 18-2) is used, and mortar is used as filler 20.

  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, the first insertion plate 18-1 having a U-shaped cross section has one edge (left edge in the figure) and the other flange (figure in the figure) of one flange (upper flange in the figure) of the H-shaped steel 12. The second insertion plate 18-2, which is in contact with one edge (the left edge in the figure) of the middle lower flange) and also has a U-shaped cross section, is the other flange of one flange of the H-section steel 12. It is in contact with the edge (right edge in the figure) and the other edge (right edge in the figure) of the other flange. The insertion plate 18 (the first insertion plate 18-1 and the second insertion plate 18-2) and the flange of the H-shaped steel 12 are only in contact with each other and are not joined to each other. That is, they are unbonded with 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 flange edge of the H-section steel 12 and the insertion plate 18 (the first insertion plate 18-1 and the second insertion plate). Relative sliding occurs at the contact portion with 18-2).

  As shown in FIGS. 1B and 1C, an assembly comprising an H-section steel constituting the brace core 12 and a pair of insertion plates 18-1 and 18-2 in contact with the H-section steel. A space is defined between the outer side surface (outer peripheral surface) of the tube and the inner side surface (inner peripheral surface) of the outer tube 16, and the mortar 20 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-shaped steel constituting the brace core 12 has a part of its outer surface (the central region in the width direction of the upper surface of the upper flange and the central region in the width direction of the lower surface of the lower flange) at the insertion plate 18. The unbonded material 22 is provided on the surface of the portion that is not covered, and therefore the portion that is not covered with the insertion plate 18 faces the mortar 20 that is the filler via the unbonded material 22. Yes. As a method of providing the unbond material 22, for example, a method of sticking an unbond tape in the form of an adhesive tape to the part, a method of applying an unbond paint to the part, and a thin steel plate as an unbond material in contact with the part And other methods can also 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 20 as the filler by the insertion plate 18 and the unbond material 22.

  Further, a filler is provided in the assembly of the H-shaped steel constituting the brace core material 12 and the insertion plate 18 (insertion plates 18-1 and 18-2) in contact with the H-shaped steel. Unfilled unfilled spaces 24-1 and 24-2 are defined, and these unfilled spaces are located on both sides of the H-shaped steel web constituting the brace core 12.

  Further, as shown in FIGS. 1A and 1C, the H-shaped steel constituting the brace core 12 has a stiffener 14 from the inside of the stiffener 14 out of the total length. A plurality of steel reinforcing plates 26 extending along the H-shaped steel 12 are joined to a portion A0 that moves to the outside of the steel plate, whereby the portion A0 is loaded on the H-shaped steel 12 in the longitudinal direction. It is an unplasticized part that does not undergo plastic deformation even if the action of. Each of the reinforcing plates 26 is located at least partially in the non-filling spaces 24-1 and 24-2. Each of the reinforcing plates 26 is welded across the upper flange and the lower flange of the H-section steel 12.

  As described above, the H-shaped steel 12 has two reinforced portions A0, which are reinforced by joining the reinforcing plate 26, out of the total length, and are non-plasticized portions, and an intermediate portion between the non-plasticized portions A0. The portion A1 is a plasticized portion that undergoes plastic deformation when a longitudinal load is applied to the H-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 26 joined to the H-shaped steel 12 and adjusting the length of the nonplasticized portion A0. it can. Further, the reinforcing plate 26 prevents the non-plasticized portion A0 from buckling when a longitudinal load is applied to the H-section steel 12. That is, the portion of the non-plasticized portion A0 that protrudes to the outside of the stiffener 14 is not stiffened by the stiffener 14 but is stiffened by the reinforcing plate 26 instead.

  2A and 2B are views showing a buckling restrained brace according to a modified example of the buckling restrained brace of FIG. 1, and FIGS. 2A and 2B are respectively ( It is a cross-sectional view corresponding to B) and (C). In the buckling-restrained brace of FIG. 1, the part of the outer surface of the H-shaped steel constituting the brace core material that is not covered with the interior plate (the central region in the width direction of the upper surface of the upper flange and the lower flange) 2, the unbond material is provided on the surface of the lower surface in the width direction), and the portion faces the mortar that is the filler via the unbond material, whereas the buckling restrained brace 10 in FIG. Of the outer surface of the H-shaped steel 12 constituting the material, the unbonded material 22 is provided on the entire upper surface of the upper flange and the left and right side edges, and the entire lower surface of the lower flange and the left and right side edges. Faces the insertion plate 18 and the filler 22 via the unbond material 22. The only difference from the buckling restrained brace of FIG. 1 is the region where the unbond material 22 is provided, and the other configuration is the same, so in FIGS. 2A and 2B, Constituent elements corresponding to the constituent elements of the buckling-restrained brace in FIG. 1 are denoted by the same reference numerals, and descriptions of the constituent elements are omitted. Depending on the type of unbond material 22 used, the buckling restrained brace of FIG. 2 may be manufactured at a lower cost than the buckling restrained brace of FIG.

  Further, the end of the stiffener 14 may be reinforced with a reinforcing material. 2A and 2B show two specific examples of the reinforcing material that can be provided at the end of the stiffener 14 of the buckling restrained brace 10 of FIG. A reinforcing material 28 shown in FIG. 2A is a reinforcing material made of a flange-shaped steel plate joined to the outer periphery of the lip of the outer tube 16. The reinforcing member 28 in this form is also suitable for reinforcing the ends of the stiffeners of the plurality of buckling-restraining braces arranged side by side with a common reinforcing member. The reinforcing member 30 shown in FIG. 2B is a reinforcing member made of a thick steel pipe that is fitted and joined to the outer periphery of the rim of the outer tube 16. As described above, when the reinforcing plate 26 is joined to the H-shaped steel 12 constituting the brace core to reinforce, the rigidity of the non-plasticized portion A0 of the H-shaped steel 12 formed thereby is large. Therefore, since a large bending moment acts on the end of the stiffener 14 from the non-plasticized portion A0, it is possible to join such reinforcing members 28 and 30 to the end of the stiffener 14. The stress transmission from the non-plasticized part A0 to the end of the stiffener 14 is preferably made possible.

  Various modifications can be made to the buckling restrained brace 10 according to the embodiment shown in FIG. FIGS. 4A and 4B and FIGS. 5A to 5D are cross-sectional views showing buckling-restrained braces according to a modified example in which such a change is made.

  The buckling restrained brace 10 according to the modified example shown in FIG. 4A uses a square steel pipe instead of a round steel pipe as the outer tube 16, and the other points are shown in FIG. The buckling restraint brace 10 has the same configuration. Further, the buckling restrained brace 10 according to the modification shown in FIG. 4B uses a square steel pipe made of a built material instead of a steel pipe made of a roll material as the outer tube 16. As for the H-section steel which comprises the brace core material 12, the whole area | region of the outer surface is covered with a pair of insertion plates 18-1 and 18-2, and the unbond material is not used. Other points are the same as those of the buckling restrained brace 10 shown in FIG.

  The buckling restrained brace 10 according to the modified example shown in FIGS. 5A and 5B uses a grooved steel in place of the H-shaped steel as the structural steel constituting the brace core 12. In the modified example shown in (A), the unbond material 22 is provided only on the portion of the outer surface of the channel steel that is not covered with the insertion plate 18, and in the modified example shown in (B), the insertion is performed. An unbond material 22 is also provided at a portion in contact with the plate 18. The buckling-restrained brace 10 according to the modification shown in FIG. 5C uses angle steel instead of H-section steel as the shape steel constituting the brace core 12. The buckling-restrained brace 10 according to the modified example shown in FIG. 5D includes a brace core 12 made of two angle steels, and an insert plate 18 in contact with each of the angle steels. It is.

  Also in the buckling-restrained brace 10 according to each modified example of FIGS. 5A to 5D, the outer tube 16 accommodates the longitudinal intermediate portion of the shape steel constituting the brace core material 12 therein. In addition, both end portions of the shape steel extend from both ends of the outer tube 16. Further, the insertion plate 18 is in contact with the intermediate portion in the longitudinal direction of the structural steel constituting the brace core member 12, extends along the structural steel, and extends over the intermediate portion in the longitudinal direction of the structural steel. Exist. Furthermore, a space is defined between the outer surface of the assembly composed of the shape steel constituting the brace core 12 and the inner plate abutting on the shape steel, and the inner surface of the outer tube. A stiffener is configured by filling the filler 20 with the filler. The filler 20 has rigidity that can function as a stiffener. Moreover, the shape steel which comprises the brace core material 12 is not covered with the insertion plate 18 in a part of its outer surface, and an unbond material 22 is provided on the surface of that part. The portion faces the filler 20 via the unbond material 22. In addition, a non-filling space 24 that is not filled with a filler is defined in an assembly composed of a section steel that constitutes the brace core 12 and an insertion plate 18 that is in contact with the section steel.

  Furthermore, also in the buckling restrained brace 10 according to the respective modified examples of FIGS. 5A to 5D, as in the embodiment of FIG. 1, out of the total length of the structural steel constituting the brace core material 12. A steel reinforcing plate extending along the section steel 12 is joined to a portion of the stiffener made of the outer tube 16 and the filler 20 from the inside to the outside of the stiffener. By reinforcing the portion, the portion may be an unplasticized portion, and the end portion of the stiffener (end portion of the outer tube 16) may be reinforced by the reinforcing material.

  As is clear from the description of the above modification, in the present invention, various shape steels can be used as the shape steel constituting the brace core material, and in particular, H-shape steel, I-shape steel, T-shape steel Z-shaped steel, angle steel, groove-shaped steel, and the like are shape steels that can be suitably used for carrying out the present invention.

  As is clear from the above, according to the buckling-restrained brace according to the present invention, the brace core material is composed of a shape steel, the stiffener material is composed of an outer tube, an insertion plate, and a filler, and While filling the space defined between the outer surface of the assembly composed of the shape steel constituting the brace core and the inner plate contacting the shape steel and the inner surface of the outer tube, A non-filling space in which no filler is filled is defined in an assembly composed of a section steel constituting the brace core and an insertion plate in contact with the section steel. Therefore, it is possible to obtain a buckling restrained brace that is lightweight and can be easily manufactured at low cost.

DESCRIPTION OF SYMBOLS 10 Buckling restraint brace 12, 12-1, 12-2 Brace core material 14 Stiffener 16 Outer tube 18, 18-1, 18-2 Inner plate 20 Filler 22 Unbond material 24, 24-1, 24- 2 Unfilled space 26 Reinforcement plate 28 Reinforcement plate 30 Reinforcement plate

Claims (8)

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,
(A) The steel material constituting the brace core is a shaped steel having a constant cross section,
(B) The stiffener is
A steel outer tube in which a longitudinal intermediate portion of the shape steel is accommodated therein, and both end portions of the shape steel extend from both ends;
At least one insertion plate that abuts against the longitudinal intermediate portion of the structural steel and extends along the structural steel;
It can function as a stiffener filled in a space defined between the outer surface of the assembly composed of the shape steel and the inner plate abutting against the shape steel and the inner surface of the outer tube. A filler having rigidity,
(C) A non-filling space in which the filler is not filled is defined in the assembly including the shape steel and the insertion plate in contact with the shape steel.
(D) As for the said shape steel, a part of the outer surface faces the said insertion board and the said filler through an unbond material,
A buckling restrained brace characterized by that.   A steel reinforcing plate extending along the shape steel is joined to a portion of the total length of the shape steel that transitions from the inside of the stiffener to the outside of the stiffener, thereby 2. The buckling restrained brace according to claim 1, wherein the portion is a non-plasticized portion that does not undergo plastic deformation even when a longitudinal load is applied to the shape steel.   By adjusting the length of the non-plasticized portion of the overall length of the shape steel, the portion of the overall length of the shape steel is plastically deformed when a longitudinal load is applied to the shape steel. The buckling restrained brace according to claim 2, wherein the length of the plasticized portion is adjusted.   The seat according to claim 2, wherein the non-plasticized portion of the overall length of the structural steel is prevented from buckling when a longitudinal load is applied to the structural steel by the reinforcing plate. Bending restraint brace.   The buckling-restraining brace according to any one of claims 2 to 4, wherein at least a part of the reinforcing plate is located in the non-filling space.   The shape steel is a shape steel selected from the class consisting of H-shape steel, I-shape steel, T-shape steel, Z-shape steel, angle steel, and groove-shape steel. The buckling restraint brace of any one of these.   The section steel is an H-section steel, and the at least one insertion plate has a U-shaped first cross section in contact with one edge of one flange of the H-section steel and one edge of the other flange. An insertion plate, and a second insertion plate having a U-shaped cross section that abuts against the other edge of one flange of the H-shaped steel and the other edge of the other flange. The buckling-restraining brace according to any one of claims 1 to 5, wherein the unfilled spaces are defined on both sides of the H-shaped steel web by a plate. A reinforcing material is joined to the end of the stiffener, thereby enabling stress transmission from the non-plasticized portion of the total length of the shaped steel to the end of the stiffener. The buckling restrained brace according to claim 2 .

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