JPH0686748B2 - Variable stiffness brace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention causes the resistance of a plurality of braces to the tension to be exerted in stages, and the rigidity of the frame is changed in multiple stages.
It relates to a variable stiffness brace.

[Problems to be Solved by the Invention]

As a method of changing the rigidity of the frame, the applicant can switch the brace separated from the frame or the connection state of the earthquake resistant wall to the frame by mechanical operation to gradually control the resistance of the brace or the earthquake resistant wall. Have been proposed.

This variable rigidity mechanism controls the resistance force of the device by operating a device that grips or locks the brace, and adjusts the natural period of the structure. As one of the means, a new brace of a mechanism that does not require mechanical operation is proposed.

[Means for Solving the Problems]

In the present invention, the brace body is made up of a plurality of brace members, and each brace member is gradually resisted according to the magnitude of the tensile force thereof, that is, the horizontal deformation of the frame, without applying a control force. The structure will change the rigidity automatically.

The stepwise resistance mechanism of a plurality of brace members has at least one end thereof penetrating a resistance plate fixed to a corner portion of a frame, and the end portion thereof is engaged with a back surface of the resistance plate when a tensile force is applied. In addition to fixing the stop member, a gap is provided between the locking member and the back surface of the resistance plate, and the gap is made different for each brace material, or a spring material having different rigidity is provided for each locking member in a gap of a predetermined size. It is obtained by interposing.

In the former case, at least one of the plurality of brace members is locked in the pulling direction on the back surface of the locking plate to secure the initial rigidity of the brace body.

The above-mentioned "at least one end" includes a case where the other end of the brace material is fixed, and the fixing method of the other end in that case is not particularly limited, and welding or bolt joining, other person skilled in the art It can be arbitrarily selected.

〔Example〕

 The present invention will be described below with reference to the drawings illustrating an embodiment.

First, the invention described in the first claim will be described.

The variable-rigidity brace B of the present invention is composed of a plurality of brace members b installed in a frame F as shown in FIG. It changes in multiple stages.

At least one of the ends of the brace material b is fixed to the corner portion of the frame F as shown in FIG.
Through the resistance plate 1 oriented in the axial direction of the brace material b, and the rear surface side thereof is locked to the back surface of the resistance plate 1 when a tensile force is applied to the brace material b, A locking member 2 such as a nut or a plate that exerts the resistance of the brace material b is fixed. A reinforcing plate 1a orthogonal to the back surface of the resistance plate 1 is joined to the resistance plate 1.

A gap is provided between each locking member 2 and the back surface of the resistance plate 1,
The size of the gap is different for each brace material b as shown in the drawing, and the locking member 2 having a small gap, that is, the brace material b, is sequentially locked to the resistance plate 1 in accordance with the magnitude of the pulling force to be varied. The rigid brace B is structured so as to exert resistance in stages. The locking member 2 fixed to at least one of the brace members b is locked to the resistance plate 1 so that the variable rigidity brace B exerts a resistance force from the start of the pulling force action.

FIG. 3 shows the load-deformation curve of the present variable stiffness brace B. As shown here, the variable stiffness brace B is shown.
The rigidity k _n of the brace material b is added to the resistance plate 1 each time the locking member 2 is locked to the resistance plate 1 according to the horizontal force acting on the frame F, that is, the horizontal deformation. It is gradually increased, and finally the sum of the rigidity of all the brace members b becomes the rigidity of the variable rigidity brace B.

Also, since the relationship between this load and the deformation is non-linear, that is, the natural period of the structure gradually changes according to the scale of the input earthquake motion, so resonance with the earthquake motion is automatically avoided. By appropriately adjusting the size of the gap between the locking members 2, it is possible to select the load-deformation relationship suitable for the vibration characteristics of the building or the ground.

FIG. 4 shows that the coil spring 3 is sandwiched between the locking member 2 and the resistance plate 1 to absorb the impact at the time of contact between the two, and the brace material b.
It prevents the impact load from working.

Next, the invention described in the second claim will be briefly described.

According to the first aspect of the present invention, as shown in FIG. 5, a spring material 4 such as a coil spring having a different rigidity is interposed in the gap between the resistance plate 1 and the locking member 2 of each brace material b. The rigidity of the brace material b is changed.

The size of the gap between the locking member 2 of each brace member b and the resistance plate 1 does not have to be changed as in the above invention, but may not be constant depending on the size of each spring member 4.

In the present invention, since the spring members 4 are arranged in parallel, when a tensile force acts on the variable-rigidity brace B, the brace members b sandwiching the spring member 4 having low rigidity sequentially exert resistance, but a certain spring member 4a is completely The rigidity of the variable-rigidity brace B in the contracted state is equal to the rigidity of the spring material 4 having the contracted spring material 4 plus the rigidity of the other spring material 4, and the load-
The deformation curve has a shape similar to that of FIG.

〔The invention's effect〕

The present invention is as described above, the rigidity is automatically changed in multiple stages without applying a control force because a plurality of brace members has a structure that exerts a resistance force stepwise depending on the magnitude of horizontal deformation, The natural period of the structure is appropriately adjusted according to the magnitude of the input earthquake motion, and at the same time, the change in rigidity can effectively avoid resonance with the earthquake motion.

[Brief description of drawings]

FIG. 1 is an elevational view showing an embodiment of the invention according to the first claim, and FIG.
The figure is an elevation view showing the details of the end portion, Fig. 3 is a load-deformation curve diagram of this variable rigidity brace, and Fig. 4 is a state in which a buffer coil spring is inserted between the locking member and the resistance plate. FIG. 5 is an elevational view showing the embodiment of the second aspect of the present invention. B ... Variable rigidity brace, b ... Brace material, F ... Frame, 1 ... Resistance plate, 1a ... Reinforcing plate, 2 ... Locking member, 3 ... Coil spring, 4 ... Spring material.

Claims (2)

[Claims] Claim: What is claimed is: 1. A brace comprising a plurality of brace materials installed in a frame, wherein each brace material gradually resists pulling to change the rigidity of the frame in multiple steps, and at least one end of the brace material. Penetrates through a resistance plate having holes for the number of brace materials fixed to the corners of the frame, and a locking member that is locked to the resistance plate when a tensile force acts is fixed to the back side of the resistance plate. The size of the gap between the locking member and the back surface of the resistance plate differs for each brace material, and at least one locking member of the brace material is locked to the resistance plate in the pulling direction. Rigid brace. 2. A spring material having a different rigidity is sandwiched between the locking members and the resistance plate, and a spring having a predetermined size is interposed between the locking members and the resistance plate. Variable stiffness brace described.