JP2601938B2 - Earth vibration energy absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention specifically relates to a seismic motion energy absorbing device that effectively absorbs vibrations caused by an earthquake.

[Prior art]

Conventionally, there are the following seismic isolation means for protecting buildings from earthquakes. That is, the isolator and the damper are separately and appropriately arranged between the building foundation and the building to prevent the building from shaking due to the earthquake. The isolator is usually formed of rubber or the like, and prevents vibration of the building base from being transmitted to the building based on its deformability. In addition, the damper absorbs vibration energy and immediately stops shaking of the building after the earthquake has subsided.

[Problems to be solved by the invention]

However, since the conventional seismic isolation means arranges the isolator and the damper separately between the building foundation and the building, the isolator and the damper are separately arranged when the planar shape of the building foundation is small. There is a problem that it is difficult to do. Therefore, the appearance of a seismic isolation device having both the functions of the isolator and the damper has been desired. Therefore, an object of the present invention is to provide a seismic motion energy absorbing device having an isolator function and capable of absorbing seismic motion energy.

[Means for Solving the Problems]

In order to achieve the above object, the seismic-motion energy absorbing device of the present invention is used as a seismic isolation device for a building, and is a seismic-motion energy absorbing device for absorbing seismic motion of several hertz or less. A seismic vibration energy absorber formed by alternately laminating a vibration energy absorbing material and a metal plate formed by mixing a ferrite powder body having a weight ratio of 100% or more with the rubber and vulcanizing the mixture into a thin plate. The vibration energy absorbing material is characterized in that the equivalent damping constant h during shear deformation is 7% or more. The rubber referred to here is a natural rubber or a synthetic rubber.

[Action]

The vibration of several hertz caused by the earthquake transmitted from the outside to the metal plate constituting the seismic motion energy absorber is transmitted to one end of the vibration energy absorber formed into a plate by mixing ferrite powder in rubber. Then, the vibration transmitted to the one end of the vibration energy absorbing material is suppressed from being transmitted to the other end by the isolator function of the vibration energy absorbing material. On the other hand, the seismic motion energy supplied to the other end of the vibration energy absorbing material is absorbed by the vibration energy absorbing function of the vibration energy absorbing material having an equivalent damping constant h of 7% or more during shear deformation. Therefore, the seismic isolation device using the seismic ground energy absorber provided with the seismic ground energy absorber prevents the vibration of the building foundation from being transmitted to the building by the vibration energy absorbing material, while transmitting the vibration to a part of the building. It absorbs the seismic motion energy and significantly reduces the shaking of the building.

【Example】

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a side view showing one embodiment of the seismic motion energy absorbing device of the present invention. The seismic energy absorber 1 in the seismic energy absorbing device is obtained by laminating and adhering vibration energy absorbing materials 2 and steel plates 3 alternately. FIGS. 2A and 2B are longitudinal sectional views of the vibration energy absorber 1. FIG. FIG. 2 (a) and FIG.
In FIG. 1B, the other is represented by an enlarged schematic diagram of one vibration energy absorbing member 2 and two steel plates 3 sandwiching the vibration energy absorbing member 2 in the seismic motion energy absorber 1 of FIG. Is expressed. The vibration energy absorbing material 2 is formed by kneading a magnetic iron oxide powder (hereinafter, referred to as a ferrite powder) 6 in a rubber 7 and vulcanizing and molding into a plate shape. Then, the upper and lower portions of the thus formed seismic energy absorber 1 are fixed to the plates 4 and 5 to form a seismic energy absorbing device. Thus, the vibration energy absorbing material 2 and the steel plate 3
Are alternately stacked to form the seismic energy absorber 1, whereby the amount of deformation of the seismic energy absorber 1 with respect to the vertical load is reduced, and the stress applied to each part of the seismic energy absorber 1 becomes uniform. The durability of the absorber 1 can be increased. FIG. 3 is a schematic view of a building using the seismic energy absorbing device shown in FIG. 1 as a seismic isolation device. In FIG. 3, a building foundation 13 is disposed on a foundation pile 12 drilled in the ground 11, and a seismic energy absorbing device 14 is arranged at an appropriate position on the building foundation 13. Then, a building 15 is constructed on the seismic motion energy absorbing device 14. FIG. 4 (a) is a horizontal displacement-shear load characteristic diagram of the seismic motion energy absorber 1 made of the ferrite powder kneaded rubber. FIG. 4 (b) is a horizontal displacement-shear load characteristic diagram of a seismic motion energy absorber made of asphalt kneaded rubber having ferrite powder as a nucleus, and FIG. 4 (c) is a seismic motion energy formed only of rubber. It is a horizontal displacement-shear load characteristic figure in an absorber, and is a figure for comparison with the seismic motion energy absorber 1 which consists of a ferrite powder kneading rubber | gum. As is apparent from these figures, the seismic energy absorber 1 made of the rubber kneaded with ferrite powder has a larger hysteresis than the seismic energy absorber made of the asphalt kneaded rubber with ferrite powder as a core and the seismic energy absorber made of only rubber. A loop is drawn, indicating that the energy absorbed in shear deformation is large. FIG. 6 is a graph showing the relationship between the amount of ferrite and the equivalent damping constant in the seismic motion energy absorber 1 made of rubber mixed with ferrite powder. As shown in FIG. 5, the equivalent damping constant h is represented by the energy absorbed, ie, the area Δw surrounded by the hysteresis loop, and the elastic energy, ie, 2 × Δ
Using the area w of OAB (B is the maximum displacement point) It is expressed as That is, the larger the value of the equivalent damping constant h, the larger the amount of energy absorbed. From FIG. 6, it can be seen that the kneading of ferrite powder into rubber increases the equivalent damping constant h and increases the amount of vibration energy absorbed. This increase in the equivalent damping constant h is due to the fact that the amount of ferrite powder to be kneaded is 200%
(Against rubber). FIG. 7 is a graph showing the relationship between the horizontal displacement a and the equivalent damping constant h when the seismic motion energy absorber 1 made of rubber kneaded with ferrite powder having a ferrite powder content of 200% (weight relative to rubber) is subjected to shear deformation. As shown in FIG. 7, the ground motion energy absorber 1 made of rubber mixed with ferrite powder has a wider horizontal position compared to the ground motion energy absorber made of rubber mixed with asphalt having ferrite powder as a core or the ground motion energy absorber made of rubber alone. Shows a high equivalent damping constant h. That is, it can be said that the seismic motion energy absorber 1 made of the rubber kneaded with ferrite powder has very excellent seismic motion energy absorbing characteristics. FIG. 8 shows a horizontal displacement a when the seismic energy absorber 1 made of rubber kneaded with ferrite powder having a ferrite powder content of 200% (weight of rubber) is subjected to shear deformation.
FIG. 7 is a diagram illustrating a relationship between and an equivalent spring constant k. From FIG. 8, it can be seen that the seismic energy absorber 1 made of rubber mixed with ferrite powder has a wider horizontal displacement than the seismic energy absorber made of rubber mixed with asphalt having ferrite powder as a core, and the seismic energy absorber made only of rubber. It shows a high equivalent spring constant k over volume. FIG. 9 shows the creep characteristics of the seismic motion energy absorber 1 made of rubber kneaded with ferrite powder having an amount of ferrite powder of 200% (by weight of rubber) when subjected to compression deformation. According to FIG. 9, the seismic energy absorber 1 composed of rubber mixed with ferrite powder has almost the same creep characteristics as the seismic energy absorber composed only of rubber, and compared with the seismic energy absorber composed of asphalt kneaded rubber having ferrite powder as a core. It can be seen that the amount of creep is greatly reduced. From the above, the seismic motion energy absorber 1 made of the rubber kneaded with ferrite powder in the present embodiment has an appropriate equivalent spring constant k, has a high energy absorption, and has extremely excellent characteristics with a small amount of creep. It was proved that it was a vibration energy absorber having. FIG. 10 shows a seismic energy absorber having a side surface as shown in FIG. 1, which is configured by using a seismic energy absorber 1 in which the vibration energy absorbing material 2 and the steel plate 3 are alternately laminated. It is prepared by the procedure shown in FIG. Here, the rubber used in this example is
It is a mixture of natural rubber and synthetic rubber at a weight ratio of 8: 2, and butadiene acrylonitrile rubber is used as the synthetic rubber. Ferrite powder is mainly Fe ₃ O
Powder ₄ was used. In FIG. 10, first, ferrite powder 100 (weight), the non-emulsion rubber (weight ratio 100), a plasticizer,
A vulcanizing agent, filler, mixing aid, etc. are blended and kneaded. Next, the kneaded material of ferrite powder and rubber is formed into a sheet having a thickness of 5 mm by a roller (sheeting), and the diameter is 30 cm.
Then, an adhesive for attaching a steel plate to both sides of the punched ferrite powder kneaded rubber is applied. Then, 24 ferrite powder-kneaded rubber plates coated with the adhesive and 23 circular steel plates having a thickness of 2.3 mm and a diameter of 315 mm are alternately laminated, fixed up and down with plates, and set in a mold. Next, the ferrite powder kneaded rubber set in the mold is heated under pressure to perform vulcanization. Thereafter, the set mold is removed to complete the seismic motion energy absorbing device. Here, the manufacturing procedure of the above-mentioned seismic motion energy absorbing device is only an example, and the present invention is not limited to this procedure. As described above, in the present embodiment, the vibration energy absorbing material 2 constituting the seismic motion energy absorbing device 14 is formed by the rubber 7 into which the ferrite powder 6 is kneaded. The seismic motion energy absorber 1 formed by alternately stacking the plates 3 has an appropriate equivalent spring constant and high energy absorption.
Therefore, the seismic motion energy absorber 1 can cut off vibration transmission by elastic deformation with an appropriate equivalent spring constant k. Furthermore, the seismic energy absorber 1 can quickly absorb seismic energy due to its high energy absorption. That is, it can be said that the seismic-motion energy absorbing device 14 using the above-mentioned seismic-motion energy absorbing body 1 has both the isolator function and the damper function. Therefore, if this earthquake motion energy absorbing device 14 is used as a seismic isolation device, the building is less likely to shake due to the earthquake, and slight shaking of the building after the earthquake has ceased is quickly stopped. In the above embodiment, it goes without saying that the weight ratio of the natural rubber to the synthetic rubber and the types of the synthetic rubber, ferrite, plasticizer, vulcanizing agent, mixing aid and the like are not limited to the above. The steel plate 3 in the above embodiment may be another metal plate.

【The invention's effect】

As is apparent from the above, the seismic motion energy absorbing device of the present invention mixes a ferrite powder in non-emulsion rubber and vulcanizes it into a thin plate to obtain an appropriate equivalent spring constant and high energy absorption. A vibration energy absorbing material is obtained, and a seismic vibration energy absorber formed by alternately laminating the vibration energy absorbing material and the metal plate is provided. Can absorb seismic energy. Therefore, if this seismic motion energy absorbing device is used for the seismic isolation device, the building is hardly shaken by the earthquake, and the slight shake of the building after the earthquake is stopped is quickly stopped.

[Brief description of the drawings]

1 is a side view showing an embodiment of a seismic motion energy absorbing device according to the present invention, FIG. 2 is a schematic sectional view of the seismic motion energy absorbing device in FIG. 1, and FIG. 3 is a seismic motion energy absorbing device shown in FIG. Fig. 4 (a) is a diagram showing the horizontal displacement-shear load characteristics of a seismic motion energy absorber made of ferrite powder kneaded rubber, and Fig. 4 (b) is asphalt kneading. FIG. 4 (c) is a graph showing the horizontal displacement-shear load characteristic of the seismic energy absorber made of rubber, FIG. 4 (c) is a graph showing the horizontal displacement-shear load characteristic of the seismic energy absorber made of rubber only, and FIG. FIG. 6 is a graph showing the characteristics of ferrite-equivalent damping constant of a seismic ground motion energy absorber made of rubber mixed with ferrite powder, and FIG. FIG. 8 shows the horizontal displacement vs. equivalent damping constant characteristics of the absorber, FIG. 8 shows the horizontal displacement vs. equivalent spring constant characteristics of the seismic motion energy absorber made of ferrite powder kneaded rubber, and FIG. 9 shows the ferrite powder kneaded rubber. FIG. 10 (a) and FIG. 10 (b) are diagrams showing creep characteristics of the seismic motion energy absorber, and are diagrams showing a manufacturing procedure of the seismic motion energy absorbing device shown in FIG. 1 ... Earthquake motion energy absorber, 2 ... Vibration energy absorber, 3 ... Steel plate, 4,5 ... Plate, 6 ...
Ferrite powder, 7 Rubber, 11 Ground, 12 Foundation pile, 13 Building foundation, 14 Earthquake motion energy absorbing device, 15 Building.

Continuing from the front page (72) Inventor Hideyo Suzuki 2-4-1 Nishi-Atsujigaoka, Chofu-shi, Tokyo Inside the Technical Research Institute, Tokyo Electric Power Company (72) Inventor Keisaburo Kubo 2-2-2 Matsuzakicho, Abeno-ku, Osaka-shi, Osaka Shares Okumura Gumi (72) Inventor Mikio Takeuchi 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka 2-7 Okumura Gumi Co., Ltd. (72) Inventor Shoichi Mayama 4-56, Hachikawakita, Ichikari-cho, Ishikari-gun, Hokkaido (56) References JP-A-60-1003064 (JP, A) JP-A-52-51428 (JP, A) Jpn.

Claims (1)

(57) [Claims] 1. A seismic energy absorbing device used as a seismic isolation device for a building, which absorbs seismic motion of several hertz or less.
A vibration energy absorbing material formed by alternately stacking a vibration energy absorbing material formed by mixing 0% or more of ferrite powder and vulcanizing into a thin plate, and a metal plate; Is a seismic motion energy absorbing device, wherein an equivalent damping constant h at the time of shear deformation is 7% or more.