JP3610004B2 - Building damping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration damping device applied to a building such as a building, and is classified as a friction damper.
[0002]
[Prior art]
In recent years, for the purpose of improving the seismic safety of buildings, the economic efficiency, and the habitability, many vibration control structures that actively reduce the shaking of buildings have been developed.
[0003]
As a vibration damping structure, there is a passive vibration damping structure in which a damper having a damping function is installed and controlled without using a computer or the like. Conventionally, this passive type vibration damping structure has a damper material such as a steel rod that yields earlier than the structure, so that the hysteresis loop that absorbs the energy of vibration by its hysteresis loop, viscoelastic body, etc. There is a viscoelastic damper that is built into the wall to damp. The hysteretic damper yields the damper material, and therefore needs to be replaced after an earthquake. The viscoelastic body and the like are greatly affected by the frequency and temperature, so that there is a drawback that the performance is different. On the other hand, the friction type damper is characterized in that the influence of the frequency and temperature is small, and the damper material does not yield, so that it is not necessary to replace it.
[0004]
[Problems to be solved by the invention]
However, the friction type damper is difficult to adjust the friction force on the friction surface, cannot be effective until the set resistance force (deformation) is applied, and when the friction shifts from static friction to dynamic friction. There were problems such as generation of vibration and noise.
[0005]
The present invention has been made in order to solve the above-described problems. The object of the present invention is to reduce the influence of frequency, temperature, etc., which are the characteristics of the conventional friction damper, as well as from a relatively small deformation. It is an object of the present invention to provide a vibration damping device that has stable history absorption until deformation.
[0006]
Another creative task was to reduce the generation of vibration and noise when the friction surface transitions from static friction to dynamic friction.
[0007]
Furthermore, it is one of the objects of the present invention to make it easier to adjust the amount of hysteresis absorption energy by adjusting the number and thickness of the springs.
[0008]
Furthermore, since the conventional friction type damper does not have a self-restoring force, the residual deformation is large.In the present invention, attention is paid to this, and a leaf spring having a self-restoring force is used to reduce the residual deformation after the earthquake. One of the purposes is to make it as small as possible.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, a plurality of leaf springs that are bent and deformed in the horizontal excitation direction at the time of an earthquake are frictionally overlapped, and the upper and lower ends thereof are respectively used as an upper structure and a lower structure of a building. The means of attaching was used. According to this means, the damping function can be obtained by the deformation ability and restoration ability of the leaf spring and the frictional force between the leaf springs. The damping performance can be adjusted by changing the number, thickness, length, and material of the leaf springs. Since the leaf spring has a self-restoring ability, the residual deformation after the earthquake is small.
[0010]
In addition, the periphery of the leaf spring was surrounded by a plurality of fastening frames stacked one above the other. According to this means, since the frictional force between the leaf springs is kept constant, an inadvertent gap is not formed between the leaf springs even when an earthquake occurs, and a stable damping function can be obtained.
[0011]
Further, since the fastening frame is divided into a plurality of layers and stacked one above the other, the fastening frame follows the deformation of the leaf spring. Therefore, since the constant holding of the frictional force by the tightening frame can be realized without hindering the deformation of the leaf spring, the damping function can be further stabilized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 show a vibration damping device according to an embodiment of the present invention. In the figure, 1 is an upper structure of a building, 2 is a lower structure of the building, and 3 is an upper structure 1 and a lower structure. 2 is a vibration damping device of the present invention applied between the two. The upper structure 1 and the lower structure 2 correspond to beams, for example.
[0013]
The vibration damping device 3 includes a bending friction damper portion 5 in which a plurality of leaf springs 4 (six in this embodiment) are closely stacked and a lower portion that fixes the bending friction damper portion 5 to the lower structure 2. A fixing jig 6, an upper mounting jig 7 that sandwiches the head of the bending friction type damper part 5 in a free end state, a clamping frame 8 that surrounds the periphery of the bending friction type damper part 5, and a bending friction type damper part 5 and an elastic body frame 9 such as rubber interposed between the fastening frame 8 and the fastening frame 8.
[0014]
The bending friction type damper portion 5 is made of a plate spring 4 such as a flat steel plate, which is overlapped so that the friction surface is bent in the weak axis direction, the lower portion is fixed by a lower fixing jig 6, and the upper portion is attached to the upper portion. By using the tool 7 as a free end, the interlayer deformation amount is converted into a bending deformation of the leaf spring 4. In the present invention, the upper and lower portions of the bending friction type damper portion may be free ends. This is also in this case because the following effects of the bending friction type damper can be obtained. In addition, even when only the lower part is a free end or both the upper and lower parts are fixed ends, it is of course within the technical scope of the present invention if the effects described below can be obtained.
[0015]
Further, the fastening frame 8 and the elastic body frame 9 are intended to adjust the degree of adhesion of the leaf spring 4 and always obtain a constant frictional force. That is, with the deformation of the bending friction type damper portion 5 at the time of the earthquake occurrence, the degree of adhesion between the leaf springs may increase or decrease, such as a gap between the leaf springs. The function cannot be obtained effectively. Therefore, in the present invention, the bending friction type damper portion 5 is tightened from the outer periphery by the tightening frame 8 and the elastic body frame 9, and the leaf springs are brought into close contact with each other even when deformed by an earthquake, and a friction surface is always formed between the leaf springs. Is.
[0016]
Here, the tightening frame 8 and the elastic body frame 9 are configured so as to follow the deformation of the bending friction type damper portion 5 as a plurality of vertically divided structures. According to this structure, not only can the deformation of the bending friction type damper portion 5 be followed, but also a friction surface is formed between the units of the fastening frame 8 and the elastic body frame 9 that are stacked one above the other. A vibration absorbing action can be obtained.
[0017]
The fastening frame 8 is formed of a material having rigidity for fastening the bending friction type damper portion 5 with a constant force, while the elastic body frame 9 is formed of an elastic body such as rubber, so that the elastic body frame 9 is formed. The bending friction type damper portion 5 and the fastening frame 8 can always be brought into close contact with each other, and the function of the fastening frame 8 can be maximized. However, the elastic body frame 9 needs to have an appropriate rigidity and hardness that does not inadvertently greatly deform. The elastic body frame 9 can be omitted. This is because the frictional force of the bending friction type damper 5 can be made constant if at least the fastening frame 8 is provided.
[0018]
FIG. 3 shows the movement of the vibration damping device of the present invention when an earthquake occurs. As shown in the figure, the bending friction type damper portion 5 is bent and deformed into a cantilever shape with the head as a free end when an earthquake occurs. To do. And the vibration which acted on the building by the earthquake at this time is attenuate | damped effectively by the deformation | transformation capability and restoring capability of the bending friction type | mold damper part 5, and the frictional force of the leaf | plate springs 4 which generate | occur | produces at the time of the said deformation | transformation.
[0019]
FIG. 4 shows the result of a dynamic horizontal vibration test of the vibration damping device according to the present invention. As is apparent from this graph, according to the vibration damping device, a stable bilinear operation from a small deformation to a large deformation is achieved. It can be seen that the mold has a hysteresis curve (load-deformation curve). Or the equivalent viscous damping constant shows a large damping property of about 30%. Furthermore, it is a great advantage that the hysteresis curve is relatively smooth and no unnecessary vibration is generated.
[0020]
【The invention's effect】
As described above, according to the vibration damping device of the present invention, the damping is obtained by the frictional force of the friction surfaces of the overlapped leaf springs, so that all the above-mentioned objects are achieved and the structure is extremely simple. There is a great structural and economic advantage that the materials used for the friction surface can also be obtained at a relatively low cost. In addition, the performance is less likely to deteriorate after an earthquake, such as a hysteresis damper, and the durability is excellent because the residual deformation is small. Furthermore, compared with viscoelastic dampers, the portion depending on temperature is extremely small, so that it can be applied in any environment.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a cross-sectional front view of a vibration damping device according to an embodiment. FIG. 2 is a schematic diagram showing a cross-sectional side view. FIG. 3 shows a deformation mode when an earthquake occurs. Fig. 4 is a schematic diagram of a cross-sectional view in front view. Fig. 4 is a graph showing the results of a dynamic horizontal excitation experiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Upper structure 2 of a building Same and lower structure 3 Vibration damping device 4 Leaf spring 5 Bending friction type damper 6 Lower fixing jig 7 Upper mounting jig 8 Tightening frame 9 Elastic body frame

Claims (1)

Superposing a plurality of leaf springs frictionally to bending deformation in the direction vibration horizontal pressure during earthquake, the upper mounting each lower end to the upper structure and lower structure of the building, around the leaf spring was further stacked together vertically A vibration control device for a building characterized by being surrounded by a plurality of laminated fastening frames .

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