JP6910701B2 - Buckling restraint brace split unit and buckling restraint brace - Google Patents

Description

The present invention relates to a buckling restraint brace split unit and a buckling restraint brace to be incorporated into the main framework of a structure, which can be split and compactly transported, especially during transport, and length when installed. The adjustment function makes it easy to assemble to the design length required in the field.

Buckling restraint brace, which is incorporated as a brace material into the main frame of the structure, is roughly divided into load-bearing brace and vibration-damping brace. In both cases, the core material is a joint to prevent overall buckling due to compressive load. Except for both ends, it is restrained in a state of being trimmed so that force is not transmitted by a buckling restraining material made of steel, concrete, or the like. In the case of a load-bearing brace, the core material does not yield axially even if the design tensile axial force acts, and even if the design compressive axial force acts, it functions as an axial force member without causing overall buckling. Because.

On the other hand, in the case of a vibration damping brace, when a tensile load is applied due to excessive shaking during an earthquake, the core material expands and yields and deforms, absorbing the seismic energy input to the structure and dampening the shaking of the structure. This is because when a compressive load is applied, the core material shrinks and yields and deforms to absorb the seismic energy input to the structure and dampen the shaking of the structure. At that time, the core material is restrained by a buckling restraining material made of steel, concrete, or the like, and is designed so as not to cause overall buckling even if local buckling is allowed.

Various types of buckling restraint braces have been conventionally developed. For example, steel pipes are arranged around the core material and concrete is filled in the steel pipes, or the diameter and weight can be reduced. It is known that various shaped steels are used as the buckling restraint material in order to achieve this, and the steel core material is buckled and restrained only by the steel material.

In the latter type, the steel core material has a cruciform cross section, angle-shaped steel materials (hereinafter referred to simply as angle steel) are assembled from all sides of the core material, and the angle steels are joined together with bolts. Restraint braces have been commercialized.

Prior art documents related to the present invention include, for example, Patent Documents 1 and 2. The invention of Patent Document 1 is a buckling stiffening member used for a seismic control brace or the like, and a flat steel of ultra-mild steel which is an axial force material is inserted into a stiffening pipe of a square steel pipe along a diagonal line of the square steel pipe. A joint plate and two stiffeners are connected to both ends of this flat steel so as to form a cross section.

Further, the invention of Patent Document 2 is a buckling restraint brace, in which reinforcing steel plates are laminated on both ends in the axial direction of a core material made of flat steel plates to form a thickened portion, and the flat steel plates are assembled by fillet welding. The core material is covered with a buckling restraining material having a rectangular cross section, and a sheet-shaped cushioning material is arranged between the buckling restraining material and the core material.

Japanese Unexamined Patent Publication No. 2000-144930 Japanese Unexamined Patent Publication No. 2000-27293

However, all of these buckling restraint braces are manufactured as a long single material, and brace materials exceeding 12 m are also manufactured. When these buckling restraints are transported by land in vehicles such as trucks, it is said that they can be transported by truck up to 12 m in the length direction without any special permission application, but transportation over 12 m is permitted. Since an application is required, there are problems such as it takes time to implement.

In addition, since it is necessary to transport by a special vehicle such as a truck pole or a tractor pole, there are problems that the arrangement is troublesome and the cost increases.

The present invention has been made to solve the above problems, and in particular, it can be divided and transported in a compact length during transportation, and it is easy to install it in the length required locally. It is an object of the present invention to provide a split unit of a buckling restraint brace and a buckling restraint brace that can be assembled in a manner.

The present invention is an invention of a buckling restraint brace incorporated as a brace material in a framework of a structure and a split unit of the buckling restraint brace for forming the buckling restraint brace (hereinafter, "split unit"). In particular, it is often installed as a seismic reinforcement member. When it is transported, it can be divided and transported in a compact length, and when it is installed, it can be easily incorporated into the framework of the assembled structure to the length required on site.

The split unit of the present invention comprises a core material main body that bears the axial force and a plurality of buckling restraining materials that are arranged around the core material main body on the side perpendicular to the material axis and restrain the buckling of the core material main body. At least one end of the core material main body on the material axial direction is provided with a joint portion to be joined to the joint portion provided at one end of the core material main body of the adjacent split unit on the material axial direction. It is characterized by being present.

Further, the buckling restraint brace of the present invention is composed of the above-mentioned plurality of split units, and is characterized in that the joint portions of the split units are joined to each other by a plurality of joining members and joining bolts. Is.

By providing a mounting portion to be joined to the frame of the structure at the other end of the core material body of the split unit on the lumber direction side, it can be easily incorporated into the frame of the structure.

Further, a buckling restraint brace having a required length can be easily manufactured by connecting a plurality of split units having joint portions at both ends on the material axis direction side of the core material body to each other.

Further, the length of the buckling restraint brace can be easily extended by arranging adjacent split units at a predetermined interval between both joints and connecting the joints with a plurality of joint members by joint bolts. Can be done (Fig. 7 (a), (b)).

_{In this case, the length L 1} of each joint member becomes longer by the distance L provided between the joint portions (both ends of each joint member are abutted against the ends of the buckling restraining material). _{The distance L 2} between the bolt holes provided at both ends of the joint member also increases.

Further, even if the joint portions of the adjacent split units are not abutted against each other, the compressive load is transmitted by abutting both ends of each joint member against the end portions of the buckling restraining material and increasing the plate thickness of the joint member. can do.

Further, by making one or both of the bolt holes provided in the joint portion and the joint member a long hole having a long axis in the material axis direction of the split unit, dimensional error and buckling when manufacturing the split unit and the joint member It is possible to easily fine-tune the construction error when incorporating the bending restraint brace into the structure (see FIGS. 6 (a) and 6 (b)).

Further, the brace core material is restrained by the buckling restraining material by joining the end portion of the brace core material having the attachment portion to the end portion of the buckling restraining material so as to be slidable in the material axial direction of the brace core material. It can be smoothly expanded and contracted (plastic deformation) in the material axis direction without any need. As a method, for example, the end of the brace core material is bolted to the end of the buckling restraint material, the bolt hole on the brace core material side is used as a screw hole, and the bolt hole on the buckling restraint material side is a loose hole. (See Fig. 2).

In addition, when reinforcing an existing structure, in an installation environment where the member carry-in path is limited or interference with existing members such as pipes and pipes cannot be avoided, the split unit of the present invention facilitates member carry-in and facilitates installation work. Is expected to be.

The buckling restraint brace of the present invention is composed of a plurality of split units, and the split units are arranged around the core material main body that bears the axial force and the core material main body on the side perpendicular to the material axis, and the core material main body. A plurality of buckling restraining materials for restraining buckling are provided, and at least one end on the material axial side of the core material main body is at least one end on the material axial side of the core material main body of the split unit adjacent to the material axial direction. Since the joint portion to be joined to the joint portion provided in the portion is provided, the split unit can be transported extremely compactly by a vehicle such as a truck when transporting.

Further, when it is installed in the structure, it can be easily incorporated into the assembled structure to a required length by joining the plurality of divided units described above in the lumber axial direction.

An embodiment of the buckling restraint brace of the present invention is shown, FIG. 1 (a) is a perspective view of the buckling restraint brace consisting of two split units, and FIG. 1 (b) is a buckling consisting of three split units. It is a perspective view of a restraint brace. An embodiment of the divided unit of the present invention is shown, FIG. 2 (a) is a plan view showing the appearance, and FIG. 2 (b) is a plan view showing the inside. The division unit shown in FIG. 2 is shown, FIG. 3 (a) is a cross-sectional view taken along the line in FIG. 2 (a), FIG. 3 (b) is a cross-sectional view taken along the line in FIG. (c) is a cross-sectional view taken along the line Ha-ha in FIG. 2 (a). 2 shows the end portion of the split unit shown in FIG. 2, FIG. 4A is an end perspective view of the side having the mounting portion, and FIG. 4B is an end perspective view of the side having the connecting portion. FIG. 1 shows a connecting portion of the buckling restraint brace shown in FIG. 1, FIG. 5A is a perspective view after connection, and FIG. 5B is a perspective view before connection. FIG. 1 shows a connecting portion of the buckling restraint brace shown in FIG. 1, FIG. 6A is a perspective view after connection, and FIG. 6B is a perspective view before connection. 7 (a) and 7 (b) are perspective views of the connecting portion after the extension of the buckling restraint brace illustrated in FIG.

1 to 7 show an embodiment of a buckling restraint brace including a split unit of the present invention and the split unit. In the figure, the split unit 1 of the present invention is made of steel and has a cross-section brace core 2 which bears an axial force and is buckled and deformed by the axial force. A plurality of steel buckling restraining materials 3 having a chevron cross section, and a plurality of spacers 4 interposed between the buckling restraining materials 3 and 3, a brace core material 2, and each buckling restraining material 3 It is provided with a cushioning material 5 interposed between the two.

The brace core material 2 is formed of steel plates having a predetermined length, and is formed in a cross-sectional shape by vertically fixing the steel plates to the centers of both sides of one steel plate by welding or the like. Further, since the inner portions from both ends in the material axial direction are formed to have a small diameter over a predetermined length in the material axial direction, the core material main body 2A is capable of yield deformation (expansion / contraction) due to axial force.

A joint portion 2B is formed at one end of the core material body 2A on the material axial direction side, and a mounting portion 2C is formed at the other end. The joint portion 2B and the mounting portion 2C are formed in the same cross-sectional cross shape as the core material main body 2A, and only the outer diameter is formed to be larger than the core material main body 2A. Further, a reinforcing flange 6a is formed at the tip of each connecting portion 6 of the joint portion 2B. The core material body 2A may be formed in a plate shape (see FIG. 3 (b)), and only the joint portions 2B and the mounting portions 2C at both ends may be formed in a cross-section.

The joint portion 2B is a joint portion for connecting the split units 1 to each other, and the mounting portion 2C axes both ends of the buckling restraint brace 1 when the buckling restraint brace 1 is incorporated into the framework of the structure. It is a joint for joining to a set.

Angle steel (angle material) or the like is used for the buckling restraining material 3. The buckling restraining material 3 is formed to have a length that covers the entire length of the core material main body 2A of the brace core material 2 and a part of the joint portion 2B and the mounting portion 2C, and is formed at each of the four corners of the brace core material 2. It is assembled in a cross-section so as to sandwich each connecting portion 6 of the brace core material 2.

Further, a spacer 4 made of a flat bar or the like is interposed on the outside of each connecting portion 6 between the buckling restraining members 3 and 3 on the side perpendicular to the material axis, and further, between each connecting portion 6 and the buckling restraining member 3. A cushioning material 5 is interposed.

The cushioning material 5 reduces the transmission of the load from the brace core material 2 to the buckling restraining material 3 by utilizing the fact that it is easily deformed, is formed of a rubber sheet or the like, and is formed from the core material main body 2A. Is interposed between the core material main body 2A and each buckling restraining material 3 so that the buckling restraining material 3 and the buckling restraining material 3 do not come into direct contact with each other.

Further, the cushioning material 5 is not limited to a rubber sheet, and a sliding plate made of a material having a small friction coefficient may be used to reduce friction so that sliding can be facilitated. A viscoelastic body may be used, and vibration energy may be absorbed by deformation of the viscoelastic body.

Further, the edge portions of the adjacent buckling restraining members 3 and 3 on the side perpendicular to the material axis are joined by a plurality of joining bolts 7 together with the spacer 4 on the outside of the core material main body 2A and each connecting portion 6. .. The joining bolts 7 are arranged at a predetermined pitch in the lumber axial direction of the buckling restraint members 3 and 3. Further, both ends of the buckling restraint members 3 and 3 on the material axial direction side are joined to the joint portion 2B and the mounting portion 2C by joint bolts 7, respectively.

In such a configuration, the buckling restraining materials 3 and 3 are located at each corner of the brace core material 2 and restrain the core material main body 2A which yields and deforms particularly under a compressive load so as not to buckle.

Further, bolt holes 11 for fastening the joining bolts 7 and 9 are formed in the joint portion 2B and the mounting portion 2C of the buckling restraining material 3, the spacer 4, and the brace core material 2, and in particular, the mounting portion of the buckling restraining material 3 is formed. The bolt holes 11 provided at the ends on the 2C side are formed in elongated holes long in the material axis direction of the brace core material 2 (FIGS. 1 (a), (b), 2 (a), 4). See (a)). As a result, when the core material body 2A of the brace core material 2 is plastically deformed (expanded and deformed), the mounting portion 2C can slide smoothly in the material axial direction, so that extra stress is generated in the brace core material 2. There is no.

Further, when the buckling restraint brace 10 is transported, it can be transported extremely compactly by mounting each split unit 1 on a vehicle such as a truck.

The split units 1 and 1 configured in this way are arranged on the same material axis with the joint portions 2B and 2B abutting each other. The buckling restraint brace 10 is formed by joining the joint portions 2B and 2B with the four joining members 8 and the plurality of joining bolts 9.

Then, by joining the mounting portions 2C and 2C at both ends to the framework of the structure, it can be incorporated into the framework of the structure.

Note that FIG. 1 (a) illustrates a buckling restraint brace configured by connecting two split units 1 and 1 on the same material axis, and FIG. 1 (b) shows. The figure shows a buckling restraint brace configured by connecting three split units 1 and 1 on the same material axis. In particular, in the case of the buckling restraint brace shown in FIG. 1 (b), the split unit 1 connected in the center is provided with joint portions 2B at both ends.

Further, adjacent split units 1 and 1 are arranged with a predetermined interval L between both joint portions 2B and 2B, and the joint portions 2B and 2B are connected to each other by a plurality of joint members 8 and joint bolts 9. Therefore, the length of the buckling restraint brace 10 can be easily extended (Figs. 7 (a) and 7 (b)). The joining member 8 can be formed of angle steel or the like, and a high-strength bolt can be used for the joining bolt 9.

_{In this case, the length L 1} of each joint member 8 becomes longer by the distance L provided between the joint portions (both ends of each joint member 8 are abutted against the ends of the buckling restraint member 3. _{), And the distance L 2} between the bolt holes 11 and 11 provided at both ends of the joint member 8 is also increased.

Further, even if the joint portions 2B and 2B of the adjacent split units 1 and 1 are not abutted against each other, both ends of each joining member 8 and the end portions of the buckling restraining member 3 are abutted against each other, and the joining member 8 Since the plate thickness is formed to be thicker, the compressive load can be transmitted, so that there is no problem of buckling due to the compressive load.

By making the bolt hole 11 provided in the joint portion 2B a long hole having a long axis in the material axis direction of the buckling restraint brace 10, the dividing units 1 and 1 can be slidable in the material axis direction (Fig. 6). (See (a) and (b)), dimensional error when manufacturing the split unit 1 and adjustment when incorporating the buckling restraint brace into the structure can be easily performed.

Further, the buckling restraint brace 10 can be extended to a required length by connecting the split unit 1 having the joint portions 2B and 2B at both ends of the core material main body 2A between the split units 1 and 1. See Figure 1 (b)). High-strength bolts are used for the joining bolts 9.

The buckling restraint brace of the present invention can be divided into a plurality of divided units for transportation and can be mounted on a vehicle such as a truck for compact transportation, and a plurality of buckling restraint braces can be incorporated into a design position of a structure. By connecting the split units of the above, it can be easily assembled to a predetermined length.

1 split unit (buckling restraint brace split unit)
2 Brace core material
2A core material body
2B fitting
2C mounting part 3 buckling restraint material 4 spacer 5 cushioning material 6 connecting part
6a Reinforcing flange 7 Joining bolt 8 Joining member 9 Joining bolt
10 Buckling restraint brace
11 Bolt holes

Claims (5)

The brace core material is provided with a brace core material that bears the axial force and a plurality of buckling restraining materials that are arranged around the brace core material in a direction perpendicular to the material axis and restrain the buckling of the brace core material. It is a split unit of buckling restraint brace that is connected to each other by a plurality of joint members and joint bolts in the material axial direction of the brace core material, and the brace core material is a core material body that deforms in the material axial direction of the brace core material and the core material body. A joint portion formed at an end portion of the core material body in the material axis direction and to which the joining member is attached is provided, and the joint portion and the joint portion of the brace core material adjacent to the joining member are joined to each other. A seat characterized in that a plurality of bolt holes through which bolts pass are provided, and the bolt holes provided in the joint portion are formed into long holes having a long axis in the material axis direction of the brace core material. Bending restraint brace split unit. The buckling restraint brace division unit according to claim 1, wherein a mounting portion to be joined to the framework of the structure is provided at the other end of the core material main body in the material axial direction. Split unit of restraint brace. The buckling restraint brace split unit according to claim 2, wherein the core material body, the joint portion, and the mounting portion are formed in a cross section. A buckling restraint brace incorporated as a brace material in a framework of a structure, wherein a plurality of split units of the buckling restraint brace according to any one of claims 1 to 3 are arranged in the material axial direction of the brace core material. A buckling restraint brace, characterized in that the joint portions of the brace core material are joined to each other. In the buckling restraint brace according to claim 4, the joint portions of the split unit are lengthened by a plurality of joint members in the material axial direction of the buckling restraint brace and a plurality of joint bolts penetrating the bolt holes of the joint portion. A buckling restraint brace characterized by an adjustable joint.

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