JPH0972002A - Brace-supporting device for structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the easier occurrence of plastic deformation due to buckling when a brace material is subjected to compressing force with the horizontal force of vibration such as earthquake than subjected to tensile strength and prevent the lowering of proof stress and energy absorbing ability when buckling deformation occurs. SOLUTION: A brace-supporting structure is such that a brace material subjected to horizontal force such as earthquake force is divided and a joint is laid therein. The mutually opposite divided ends of rigid rods 22a, 22b constituting braces 22 are inserted into a ring 20 as the joint so that it can be escaped to the center of the ring 20 when the brace materials is subjected to force from the compressed direction along the axes. When subjected to force with the tensile direction, the brace material 22 is given tensile strength via a spring 26 laid between a nut 24 for a locking strip provided at the inserted ends of the rigid rods 22a, 22b and the ring 20 or via a vibration absorber such as a lead, so that it can withstand the horizontal force while restraining the vibration of a building.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brace support device provided in a structure such as a building to withstand horizontal forces such as earthquakes and severe vibrations, and in particular, it is possible to prevent a decrease in yield strength due to buckling of a brace material. The present invention relates to such a brace device.

[0002]

2. Description of the Related Art Generally, when a strong repeated load is applied to a vertical column or a horizontal member of a structure such as a building due to wind pressure, seismic force, or the like, a brace material for resisting the horizontal force is along the axis of the material. Tension and compression alternately act in the longitudinal direction, but bracing materials such as shaped steel and steel rods can withstand tensile force sufficiently, but compared with this tensile force However, plastic deformation due to buckling is likely to occur, and such plastic deformation causes a decrease in proof stress, and since it is difficult to restore, cracks or separation may occur at the joints at both ends of the brace frame. I will end up.

Therefore, in order to enhance the energy absorption capability of the entire brace frame, (1) the brace frame generally has high elastic rigidity and horizontal external force is likely to be concentrated and distributed first. A method of supplementing steel to prevent buckling so as not to reduce the yield strength due to buckling, or (2) from the viewpoint that the brace frame history properties depend on the behavior of the brace after buckling. A method of causing the yield of other parts to precede the buckling of the material,
Alternatively, (3) applying tension to the brace material beforehand from the viewpoint of restoring the original straight state within the elastic limit of the brace material even if a repeated load of compression and tension is applied to the brace material as an external force. Every time, a method of improving rigidity and strength against load and vibration is adopted.

Here, as the method of the above (3), a brace support in which a turnbuckle is interposed as a joint part in the middle of the brace material so that a tension force is applied in the longitudinal direction along the material axis in advance. The device is 4-75
It is disclosed in Japanese Patent Publication No. 971.

As shown in FIGS. 3 and 4, this brace supporting device is intended for a heavy construction structure 1 formed by vertical columns 4, lateral members 6, brace members 3 and an upper cover plate or floor plate 7, etc. Is. As shown in FIG. 4, two hard rods 3 ', 3'constituting the brace member 3 are arranged on the same center line, and male screws 1 formed in opposite ends thereof in mutually opposite directions.
Screws 1 and 11 into female screws 12 and 12 formed in the opposite ends of the turnbuckle 2 in mutually opposite directions so that both rigid bars 3'and 3 '.
And the flat plate 1 on the other end of each of the rigid rods 3 ', 3'.
3 is welded, a bolt hole 14 is bored in the flat plate 13, and the other end of the rigid rods 3 ′, 3 ′ is directly attached to the vertical columns 4 and 4 or through the cross member 6 by a bolt inserted into the hole 14. The two brace members 3 and 3 are indirectly fixed to each other and installed between the upright columns 4 and 4 so as to cross each other. Therefore, the hard rod 3 ',
3'is prevented from rotating around the center line a, and the turnbuckle 2 can be rotated around the center line a to pretension the brace member 3 in advance.

According to this structure, the brace member 3
Since a tension force is applied in advance in the longitudinal direction by the turnbuckle 2, the load in the compression direction input in the longitudinal direction along the material axis of the brace member 3 is canceled by the tension force applied in advance. Therefore, the limit of buckling of the brace member 3 against the input is increased by this tension force,
The restoration property to the original straight line state can be improved. It should be noted that the inertial rotation of the buckle 2 is prevented by the anti-rotation metal fitting 5 supported on the end portion of the brace material.

[0007]

[Problems to be Solved by the Invention]
The brace support device by the method of (1) is not efficient because the steel supplement work is troublesome and the energy absorption capacity does not improve much with respect to the amount of the supplement steel.

Further, in the brace supporting device of the method (2),
The limit of improvement of energy absorption capacity is low, and it is difficult to obtain sufficient proof strength against a large earthquake.

In the brace device of the method (3), the tension force is applied as an internal stress by the turnbuckle provided in the middle of the brace material, but since the brace material functions as an integral rigid bar, When a large amount of vibration energy is applied, such as during an earthquake, it is unavoidable that a compressive force greater than the above tension force is applied. There is a risk of bending and there is room for improvement in terms of further enhancing the energy absorption capacity of the brace frame as a whole.

The present invention has been made in view of the above problems, and an object thereof is to prevent the occurrence of buckling without applying a compressive force to a brace material, and to prevent a large vibration energy such as an earthquake. It is an object of the present invention to provide a brace supporting device for a structure having a high energy absorbing capacity as a whole frame.

[0011]

In order to achieve the above object, in the present invention, a brace support device for a structure is constructed as follows.

In the invention according to claim 1 of the present application, in the brace supporting device for a structure, the middle portion of the brace material that receives a horizontal force such as seismic force is divided, and the joint portion is interposed between the divided end portions. The joint portion engages with the split end portions in response to an input in a tensile direction applied along the material axis of the brace material by the horizontal force to generate a tensile force on the brace material, while a compressing direction is generated. With respect to the input of, both the divided ends are connected to each other so that the displacement of both divided ends is allowed and the compressive force is not generated in the brace material, and the brace against horizontal force such as seismic force. While exerting a tensile force on the material to resist it, it also prevents the compressive force from being applied to prevent buckling deformation of the brace material and improves the energy absorption capacity of the entire frame.

Further, in the invention according to claim 2 of the present application, a brace supporting device for a structure in which the middle of the brace material which receives a horizontal force such as seismic force is divided and a joint is interposed between the divided ends. In at least one of the divided ends of the rigid bar that constitutes the brace member, the annular member as the joint portion is applied to the annular member with respect to an input in the compression direction applied by the horizontal force along the material axis of the brace member. It is inserted so that it can escape in the direction of the center of the body, and for the input in the pulling direction, an engaging piece and an annular body provided at the insertion tip end are inserted through a vibration absorber. It is configured to be engaged.

When a force in the pulling direction is input along the material axis so that the divided ends are separated from each other by the horizontal force such as seismic force, the rigid rod forming the brace member is separated from the tip end of the steel rod and the annular shape. The gap with the body is closed, the insertion end of these steel rods and the annular body are engaged with each other via the vibration absorber, and a tensile force is generated,
Resist the horizontal force. On the other hand, when a force in the compression direction is input along the material axis so that the split ends come close to the steel rod,
The divided ends escape toward the center of the annular body, and no compressive force acts on the rigid bar, so that the brace material does not buckle regardless of its shape or slenderness ratio. Therefore, the yield strength does not decrease. That is, the joint portion functions as a joint portion that prevents the compressive force from being applied so that the brace material does not buckle.

Further, when the brace frame and the frame frame stand side by side, the restoring force characteristics can be improved by controlling the interlayer displacement when the brace frame shares the horizontal force.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings.

In FIG. 1, 22 is a brace material,
Two hard rods 22a, 22 that are dividedly arranged on the same center line
b. Two of the brace members 22 are installed so as to intersect with each other, and the total of four hard rods 22a and 22b forming the both brace members 22 are arranged in the axial direction of the annular body 20 serving as the joint portion thereof. It is connected so as to be able to escape toward the center of the annular body 20 in response to the input in the compression direction.

That is, the annular body 20 is provided with through holes 21 in four directions from the center thereof, and the divided ends of the rigid rods 22a and 22b facing each other from the outer peripheral surface of the annular body 20 are axially formed. It is inserted slidably in the direction. Then, a nut 24 is screwed as a brim-shaped locking piece to the insertion distal end portion 23 projecting inside the annular body 20 and formed with a male screw. In addition, the insertion tip portion 23 protruding inside the annular body 20 has a coil spring 2 having a washer 25 between a nut 24 as a locking piece and the inner peripheral surface of the annular body 20.
An elastic body 6 is fitted as a vibration absorber. In this way, each brace member 22 has its rigid rods 22a, 2
2b are connected to each other. However, the pair of rigid rods 22 a and 22 b forming each brace member 22 have the insertion tip portion 2 thereof.
The distances 3 and 23 are separated from each other by a distance effective as the relief.

The other ends of the rigid rods 22a and 22b are welded to the flat plate 13 as described with reference to FIG.
It is fixed to the uprights 4, 4 directly or indirectly via the cross member 6 by a bolt inserted in a bolt hole 14 formed in this.

In this way, the two brace members 22 and 22 which are erected so as to cross each other between the upright columns 4 and 4 are the rigid rods 2.
Since the rotations of the brace members 2a and 22b are regulated and fixed, by rotating the nut 24 against the coil spring 26, a tension force can be applied to the brace members 22 and 22.

According to the brace supporting device having the above structure, since the tension force is applied to the brace members 22 and 22 in the longitudinal direction by the coil spring 26, the brace members 22 and 2 are
2 controls the interlayer displacement in the horizontal direction of the brace frame, which makes it possible to improve the restoring force characteristics.

When interlayer displacement occurs in the brace frame due to the horizontal force of vibration such as an earthquake, as in the case of connecting a pair of rigid bars by a conventional turnbuckle, the material in the longitudinal direction of the brace member 22. With respect to the input in the pulling direction along the axis, the steel rods 22a and 22b are engaged with each other through the coil spring 26 and the annular body 20 to generate a larger tension and resist the horizontal force. At the same time, the coil spring 26 absorbs and damps vibrations. On the other hand, conversely brace material 2
For the input in the compression direction along the longitudinal material axis of 2, the insertion end portions 23 of the rigid rods 22a and 22b are connected to the annular body 2.
The brace member 22 is only displaced to the center of 0, and no compressive force acts on the brace member 22. Therefore, the brace member 22 does not buckle regardless of its shape or slenderness ratio. For this reason,
Since it is not plastically deformed, it can be restored to the original straight state, and the proof stress of the brace member 22 does not decrease.

In the above embodiment, in the annular body 20 which is a joint portion of a brace material made of a hard rod, a coil spring which is an elastic body as a vibration absorber is disposed between the inner surface of the annular body 20 and the nut 24 which is a locking piece of the brace material 22. 26 was interposed,
Instead of this type of spring, for example, a unidirectional damper using hydraulic pressure or superplastic material such as lead may be interposed, which also suppresses the vibration of the building and the seat of the brace material in the same manner as above. It is possible to prevent buckling.

In the embodiment shown in FIG. 1, the annular body 20 is used.
Is a single true circular ring, but it does not necessarily have to be a circular ring, and may be a square or polygonal ring.

Further, as shown in FIG. 2, it does not necessarily have to be a single annular body. The annular body 30 shown in the figure has U-shaped frames 34 integrally welded to the four circumferential sides of a square block 32 made of steel, and has a cross shape as a whole to form four annular portions. Have The U-shaped frame 34 forming each annular portion has a through hole 2 at the center of its tip.
1 is formed, the tip of the brace material 22 is inserted into the through hole 21 as in the case of FIG. 1, and the coil spring 26 is interposed and locked by the nut 24.

The present invention can be applied not only to buildings and general structures but also to heavy erected structures such as erection piers and erection gantry.

[0027]

As described above, in the invention according to claim 1 of the present application, the middle portion of the brace material that receives horizontal force such as seismic force is divided, and the joint portion is interposed between the divided end portions. In a brace supporting device for a structure, the joint portion engages with both of the divided end portions and pulls on the brace material in response to an input in a tensile direction applied along the material axis of the brace material by the horizontal force. While the force is generated, both split ends are connected to each other so that displacement of both split ends is allowed for input in the compression direction and no compressive force is generated on the brace material. For the horizontal force of vibration such as
While a tensile force is generated in the brace material to obtain a sufficient resistance force, it is possible to prevent the buckling deformation of the brace material by preventing the compressive force from being applied, and to prevent the decrease of the proof stress due to the buckling deformation and the entire frame structure. It is possible to improve the energy absorption capacity as much as possible.

Further, in the invention according to claim 2 of the present application, the brace supporting device for a structure in which the middle of the brace material that receives a horizontal force such as seismic force is divided and a joint is interposed between the divided ends. In at least one of the divided ends of the rigid bar that constitutes the brace member, the annular member as the joint portion is applied to the annular member with respect to an input in the compression direction applied by the horizontal force along the material axis of the brace member. It is inserted so that it can escape in the direction of the center of the body, and for the input in the pulling direction, an engaging piece and an annular body provided at the insertion tip end are inserted through a vibration absorber. Since the structure is made to engage, when a force in the tension direction is input along the material axis to the rigid bar that constitutes the brace material due to the horizontal force of vibration such as an earthquake, the insertion end of the steel bar and the annular With a vibration absorber interposed between the body While the dynamic imbibed attenuation causes a tensile force while it is possible to resist the horizontal force,
When a force in the compression direction is input to the steel rod along the material axis, it is possible to prevent the split end portion from escaping toward the center of the annular body and to prevent the rigid rod from being subjected to the compression force. For this reason, it is possible to prevent buckling of the brace material regardless of its shape and slenderness ratio, to prevent a decrease in yield strength due to buckling deformation, and to improve the energy absorption capacity of the entire frame as much as possible. Can be made.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a brace support device of the present invention.

FIG. 2 is a view showing another embodiment example of the brace support device of the present invention.

FIG. 3 is a perspective view showing a construction structure using a conventional brace support device.

FIG. 4 is a perspective view of a conventional turnbuckle brace.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Overlay structure 2 Turnbuckle 3 Brace 3'Rigid bar 4 Standing column 5 Anti-rotation metal fittings 6 Cross member 11 Male screw 12 Female screw 13 Flat plate 14 Bolt hole 20 Annular body (joint part) 21 Through hole 22 Brace material 22a, 22b Hard rod 23 Insertion Tip 24 Nut (Locking Piece) 25 Washer 26 Coil Spring (Vibration Absorber)

Claims (2)

[Claims] 1. A brace supporting device for a structure, wherein a middle portion of a brace material that receives a horizontal force such as seismic force is divided, and a joint portion is interposed between the divided end portions. For the input in the tensile direction applied along the axis of the brace material, the split ends are engaged to generate a tensile force in the brace material, while for the input in the compression direction, the split A brace support device for a structure, characterized in that the divided end portions are connected to each other so as to allow the displacement of the end portions and not to generate a compressive force in the brace material. 2. A brace supporting device for a structure, wherein a middle portion of a brace material that receives a horizontal force such as seismic force is divided, and a joint portion is interposed between the divided end portions. One of the split ends is designed to be able to escape toward the center of the annular body as a joint portion against the input in the compression direction applied along the material axis of the brace material by the horizontal force. For the insertion and the input in the pulling direction, the engaging piece provided at the insertion tip and the annular body are engaged via a vibration absorber interposed therebetween. Brace support device.