JP2000220211A - Brace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce weight and to improve productivity while heightening bulking strength of a brace constituting the frame of a steel structure or a steel-framed reinforced concrete structure. SOLUTION: Rectangular steel pipes 14 are opposedly arranged on both side parts of a core member 13 formed of plate steel, so as to be movable in the axial direction of the core member 13. The rectangular steel pipes 14 are continuously welded to each other in the lengthwise direction to constitute a brace 10. With this constitution, when a compressive force acts upon the brace, the out-of-plane deformation of the core member 13 is impeded by the rectangular steel pipes 14. Since the main members of the brace 10 are composed of only steel, the weight increase of the brace 10 is suppressed, and assembling work is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brace forming a frame of a steel structure or a steel reinforced concrete structure.

[0002]

2. Description of the Related Art Generally, in a steel structure or a steel reinforced concrete structure, as shown in FIG. 3 (a), a column 11 and a beam 12 are combined in a quadrilateral, and two braces 2 are slanted to improve earthquake resistance. The shaft assembly 1 is provided.

As shown in FIG. 3 (b), when a horizontal load F acts on the shaft 1 due to an earthquake or the like, the shaft 1
Is deformed into a diamond shape, and at the same time a tensile force acts on one of the braces 2 and a compressive force acts on the other brace 2 so as to buckle. Therefore, in order to improve the seismic resistance of frame 1,
It is necessary to increase the rigidity of the frame 1 by using the brace 2 which does not easily buckle even when subjected to a compressive force. In particular, when the beam 12 is weak, as shown in FIG. 3C, the beam 12 is broken by receiving the horizontal load F, so that the buckling strength required for the brace 2 is further increased.

In view of the above, as shown in FIG. 4, various braces 3 and 4 having improved buckling strength have been proposed.

For example, a brace 3 shown in FIG.
After performing an unbonding process on the surface of a core material 5 made of a flat steel material, the core material 5 is surrounded by a steel pipe 6, and a mortar 7 is filled between the core material 5 and the steel pipe 6 and hardened. In the brace 3, the core material 5 is reinforced by the mortar 7 and the steel pipe 6, and the core material 5 and the mortar 7 are separated by the unbonding process, so that the axial force (compression force, tensile force) acting on the core material 5 is reduced. It does not transmit to the mortar 7 and the steel pipe 6.

A brace 4 shown in FIG. 4 (b) is obtained by performing an unbonding process on a surface of a core material 8 made of a cross-section steel material, and coating the periphery of the core material 8 with fiber reinforced concrete 9. is there. In the brace 4, the core material 8 is reinforced by the fiber-reinforced concrete 9, and the core material 8 is separated from the fiber-reinforced concrete 9 by unbonding, whereby the axial force acting on the core material 8 is transmitted to the fiber-reinforced concrete 9. It is not to be.

[0007]

However, the following problems to be improved still remain in the braces 3 and 4 according to the conventional proposals as described above.

First, the weight of the mortar 7 and the fiber reinforced concrete 9 disposed around the core members 5 and 8 is heavy, which causes the weight of the braces 3 and 4 themselves to increase, and these braces 3 and 4 are incorporated. Since the supporting load of other steel materials of the frame 1 to be increased increases, the design strength of the entire frame 1 must be increased.

Secondly, in addition to the work of unbonding the cores 5 and 8, the work of filling the mortar 7 and the fiber reinforced concrete 9 is required, so that the production of the braces 3 and 4 is troublesome and costly.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a brace that is lightweight and has excellent productivity while increasing buckling strength.

[0011]

According to a first aspect of the present invention, there is provided a core material made of a flat steel material, and rectangular steel pipes are movable on both sides of the core material in the axial direction of the core material. , And these rectangular steel pipes are welded and connected in the longitudinal direction.

According to a second aspect of the present invention, there is provided a core member made of a cross-section steel member, and rectangular steel pipes are provided at respective corners of the core member so as to be movably opposed in the axial direction of the core member. Then, the rectangular steel pipes adjacent to each other among these rectangular steel pipes are welded and connected in the longitudinal direction.

By employing such a configuration, when a compressive force is applied to the brace, out-of-plane deformation of the core material is prevented by the rectangular steel pipe. Further, since the core material and each square steel pipe can move in the axial direction, the axial force of the core material does not propagate to these square steel pipes. Furthermore, since the main member of the brace is made of only a steel material, an increase in the weight of the brace is suppressed, and the assembling operation is simplified.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIGS. 1A and 1B are diagrams showing a first embodiment of a brace according to the present invention, wherein FIG. 1A is a front view, FIG. 1B is a side view, and FIG. A-A of (a)
It is sectional drawing by a line.

The brace 10 has, as shown in FIG.
It has a core 13 made of a flat steel material, and a large number of bolt insertion holes 13a are formed at both ends of the core 13 respectively. Plates 15 are welded to both ends of the core material 13 so as to cross each other, and each plate 15 has a large number of bolt insertion holes 15a. On the other hand, a pair (two) of rectangular steel pipes 14 having a rectangular cross section are provided on both sides of the core 13 so as to face each other, and are bolted to the core 13 so as to be movable in the axial direction. These rectangular steel tubes 14 are continuously welded to each other in the longitudinal direction.

That is, each square steel pipe 14 has
As shown in (a), a round hole 14a is formed at one end thereof, and a long hole 14b is formed at the other end thereof along the longitudinal direction of the rectangular steel pipe 14.
Bolts (not shown) are inserted through the core material 13 sandwiched between the pair of square steel pipes 4a and the elongated hole 14b. As shown in FIGS. 1 (b) and 1 (c), the rectangular steel pipes 14 are continuously welded in the longitudinal direction of the rectangular steel pipe 14 at two locations outside the core member 13 and are rigidly connected. A predetermined gap between each square steel pipe 14 and the core 13 (even if the thickness is slightly increased due to the compressive force acting on the core 13, the gap between the core 13 and each square steel Is formed so as not to generate a frictional force on the core material 13, so that the rectangular steel pipe 14 is separated from the core 13. Therefore, one end of each square steel pipe 14 is fixed to the core 13 by pin connection while its axial movement is restrained, but the other end of each square steel pipe 14 is axially moved to the core 13. The rectangular steel pipes 14 are fixed in an acceptable form, and are movable in the axial direction with respect to the core material 13.

Incidentally, in order to assemble the brace 10, square steel pipes 14 are arranged on both sides of the core material 13, these square steel pipes 14 are bolted to the core material 13, and then the square steel pipes 14 are mutually connected. Weld. in this way,
Since the assembly of the brace 10 is completed by a simple operation such as bolt joining and welding, and becomes a dry method, unlike a conventional wet method in which a fluid is handled, such as an unbonding process or a filling operation of mortar or fiber reinforced concrete, It does not pollute the construction site.

The brace 1 thus assembled
0 is combined with columns and beams to form a frame. However, even if a horizontal load acts on this frame and compressive force acts on the brace 10, the core 13 is attached to the double-sided steel pipe 14. The brace 10 does not buckle because it cannot be deformed by being pinched. Therefore, the rigidity of the frame using the brace 10 increases, and the earthquake resistance increases. At this time, as described above, since each square steel pipe 14 is movable in the axial direction with respect to the core 13, the axial force acting on the core 13 is not transmitted to each square steel pipe 14. Thus, the original strength of these square steel pipes 14 can be secured.

Further, the main members constituting the brace 10 are all steel materials, and since these steel materials are general materials, they are lighter and less expensive than conventional braces using mortar or fiber reinforced concrete. As a result, the work of attaching to the frame is facilitated, and at the same time, the supporting load of the columns and beams constituting the frame is reduced, and the required strength of these columns and beams is reduced.

In the above-described embodiment, the brace 10 using the core material 13 made of a flat steel material has been described. However, as shown in FIG. 2, a core material 31 made of a cross-section steel material may be used instead. Can also. Hereinafter, the brace 30 having the core material 31 made of such a cross-shaped steel material will be described.

<Second Embodiment> FIGS. 2A and 2B are views showing a brace according to a second embodiment of the present invention, wherein FIG. 2A is a front view thereof, and FIG. 2B is an AA line of FIG. FIG.

This brace 30 is, as shown in FIG.
It has a core 31 made of a cross-section steel material, and has a core 3
A large number of bolt insertion holes 31a are formed at both ends of each of the bolts. On the other hand, four square steel pipes 32 each having a square cross section are opposed to each other at four corners of the core material 31, and the core material 3 is provided.
1 are bolted so as to be movable in the axial direction thereof, and these square steel pipes 32 are continuously welded to each other in the longitudinal direction thereof.

That is, each square steel pipe 32 has the structure shown in FIG.
As shown in (a), a round hole 32a is formed at one end thereof, and a long hole 32b is formed at the other end thereof along the longitudinal direction of the rectangular steel pipe 32.
Bolts (not shown) are inserted through the core material 31 through the elongated holes 2a and the elongated holes 32b, respectively. As shown in FIG. 2B, the rectangular steel pipes 32 adjacent to each other among the rectangular steel pipes 32 are continuously welded in the length direction of the rectangular steel pipes 32 at four locations outside the core material 31 to be rigid. A predetermined gap is provided between each square steel pipe 32 and the core material 31 (even if the thickness is slightly increased due to a compressive force acting on the core material 31, the core material 31 and each square steel pipe are Since no gap is formed between the rectangular steel pipes 32 and the core material 31, all the square steel pipes 32 are separated from the core 31. Accordingly, one end of each square steel pipe 32 is fixed to the core 31 by pin connection while its movement in the axial direction is restricted, but the other end of each square steel pipe 32 is moved to the core 31 in the axial direction. The rectangular steel pipes 32 are fixed in an acceptable form, and are movable in the axial direction with respect to the core material 31.

In order to assemble the brace 30, the square steel pipes 32 are arranged at the respective corners of the core material 31 and these square steel pipes 32 are joined to the core material 31 by bolts. To weld. in this way,
Since the assembly of the brace 30 is completed by a simple operation such as bolt joining or welding and becomes a dry method, unlike a conventional wet method that handles a fluid such as unbonding treatment or filling work of mortar or fiber reinforced concrete, It does not pollute the construction site.

The brace 3 assembled in this manner is
0 is combined with a column or a beam to form a frame. However, even if a horizontal load acts on this frame and a compressive force acts on the brace 30, the core 13 is formed of four square steel pipes. The brace 30 does not buckle because it cannot be out-of-plane deformed by being sandwiched between the braces 32. In addition, these square steel pipes 32 are
Since the brace 30 is arranged on all four sides, a stable out-of-plane deformation suppressing function can be obtained in all radial directions of the brace 30. Therefore, the rigidity of the frame using the brace 30 increases, and the earthquake resistance increases. At this time, as described above, since each of the square steel pipes 32 is movable in the axial direction with respect to the core 31, the axial force acting on the core 31 is not transmitted to each square steel pipe 32. In addition, the original strength of the square steel pipe 32 can be secured.

Furthermore, the main members constituting the brace 30 are all steel materials, and since these steel materials are general materials, they are lighter and less expensive than conventional braces using mortar or fiber reinforced concrete. As a result, the work of attaching to the frame is facilitated, and at the same time, the supporting load of the columns and beams constituting the frame is reduced, and the required strength of these columns and beams is reduced.

In each of the above-described embodiments, by providing a gap between the core members 13 and 31 and the square steel tubes 14 and 32, the axial force of the core members 13 and 31 is
Although the case of avoiding propagation to the cores 4 and 32 has been described, any method may be adopted as long as the rectangular steel pipes 14 and 32 can move freely with respect to the core members 13 and 31. For example, a friction reducing material such as paper, synthetic resin, or tape may be interposed between the core members 13 and 31 and the rectangular steel pipes 14 and 32.

In each of the above-described embodiments, the braces 10 and 30 in which the rectangular steel pipes 14 and 32 are continuously welded to each other in the longitudinal direction have been described.
As a welding method for the elements 4 and 32, in addition to this continuous welding, intermittent welding can also be used.

Further, the shape of both ends of the braces 10 and 30 (portions where the rectangular steel pipes 14 and 32 are not attached) is not important in the present invention. That is, in the first embodiment described above, the plates 15 are attached to both ends of the core material 13 so that both ends of the brace 10 have a cross-sectional shape. It may be. Further, in the above-described second embodiment, both ends of the brace 30 have the same cross-sectional shape as the central portion, but both ends of the brace 30 may be flat.

[0031]

As described above, according to the first aspect of the present invention, when a compressive force acts on the brace, out-of-plane deformation of the core material is prevented by the square steel pipe, so that the brace seat is provided. Flexural strength can be increased. Further, since the core material and each square steel pipe can move in the axial direction, the axial force of the core material does not propagate to these square steel pipes, so that the strength of the square steel pipe can be ensured. Furthermore, since the main members of the brace are made of only steel, an increase in the weight of the brace is suppressed, and the assembling operation is simplified, so that the brace can be reduced in weight and the productivity can be improved.

According to the present invention described in claim 2,
In addition to the above-described functions and effects, since the square steel pipes are arranged on all sides around the core material, the function of suppressing the out-of-plane deformation of the brace is exhibited in all radial directions, thereby further increasing the buckling strength of the brace. be able to.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a brace according to the present invention, wherein (a) is a front view thereof, (b) is a side view thereof,
(C) is a sectional view taken along line AA of (a).

FIGS. 2A and 2B are views showing a brace according to a second embodiment of the present invention, wherein FIG. 2A is a front view thereof, and FIG.
It is sectional drawing by the A line.

3A and 3B are schematic diagrams showing an example of a steel frame structure, in which FIG. 3A is a state diagram in a normal state, and FIGS. 3B and 3C are deformation state diagrams when a horizontal load is applied.

FIG. 4 is a cross-sectional view showing two examples of a conventional brace.

[Explanation of symbols]

 10, 30 brace 13, 31 core material 14, 32 square steel pipe

Claims (2)

[Claims] 1. A core material made of a flat steel material, and rectangular steel pipes are disposed on both sides of the core material so as to be movably opposed to each other in the axial direction of the core material. A brace characterized by being connected by welding in different directions. 2. A core member made of a cross-section steel member, and a square steel tube is disposed at each corner of the core member so as to be movably opposed to each other in the axial direction of the core member. A brace wherein adjacent rectangular steel pipes are connected by welding in the longitudinal direction thereof.