JPH094279A - Seismic isolator - Google Patents

Abstract

PURPOSE: To specifically protect a seismic isolating device against horizontal shaking earthquakes out of seismic isolating devices which are capable of protecting a small-scale building compared with a large-scale building with a preference to vertically shaking earthquakes with a vertical shock or horizontally shaking earthquakes and protect a building or a structure from an earthquake by attaching a seismic isolating device against vertically shaking earthquake with a vertical shack and installing the device against vertically shaking earthquakes with a vertical shock between a foundation area and structure posts. CONSTITUTION: A seismic isolating device is installed between the upper part of a foundation 7 and a post 6 which supports a building where steel-made spheres 3 are sandwiched between a parabolic type steel-made pedestal of a substructure which is steel saucer-shaped and whose central part is lowered and an upper steel-made pedestal 1 which are opposed to each other. When an earthquake occurs, the acceleration of a rolling earthquake is added to the lower steel-made pedestal 2 and the steel-made spheres 3 are forced to rise turningly, drawing a parabolic slope so that a rising stress may be turned to reaction, thereby eliminating seismic acceleration and isolating a structure on the upper steel-made pedestal 1. By way of experiment, the effect is set to 500gal on an earthquake test bench. The test result on this test bench is measured on a floor surface of the building where 980gal is isolated.

Description

Detailed Description of the Invention

[Industrial field of application] The seismic isolation device of the present invention is installed between a foundation (7) of a building or structure and a pillar (6) supporting the structure to attenuate the impact of a rolling earthquake. It is a device with a simple structure that protects buildings and structures from rolling earthquakes.

[Prior Art] In many conventional seismic isolation devices, structures utilizing the elasticity of rubber are used, and it is feared that these secularly deteriorate and their seismic isolation capability deteriorates.

[Problems to be Solved by the Invention] In the case of a device that seismically sways and directly below vertical vibrations in a single body, it is impossible to provide a device that can handle large gravity. The seismic isolation device is a seismic isolation device for seismic isolation, and this seismic isolation device is a seismic isolation device exclusively for seismic earthquakes. Since the entire structure is made of steel, it is a simple structure that does not worry about deterioration. Is.

[Means for Solving the Problem] The seismic isolation device for this rolling-type earthquake is a steel plate-shaped parabolic lower steel plate pedestal (2) having a low point in the center and an upper steel plate. A structure in which steel balls (3) are sandwiched between the plate trays (1) facing each other.

[Operation] The acceleration of the rolling earthquake is applied to the lower steel plate pedestal (2), and the steel ball (3) is rotated up and down the parabolic gradient, and the rising stress becomes a reaction force, and the seismic acceleration disappears. , The structure on the upper steel plate pedestal (1) is seismically isolated.

[Example] An experiment was carried out with a building area of 50 m ^{2 and a} total floor area of 1
It is a steel-framed two-story building of 00m ² , and the weight of the building per m ²
Assuming a total weight of 50 TONs with a total weight of 50 TONs, the distributed supporting load of the four fulcrums was regarded as a static load of 12.5 TON, and it was carried out in parallel with the vertical seismic isolation device (8). Due to the earthquake test bench, the experiment was carried out with a structure in which the building was reduced to 1/20 of the actual size. The measuring instrument is the seismometer SM-23 of Rion.
It was measured using B. No. 10850445. First, roll the seismic test bench to 500 GAL (Magnitude “7”)
The experiment was repeated several times.

[Effect of the invention] As a result of the experiment, a rolling earthquake 5
Measured on the floor of the 1st floor against 00GAL, the average moment is 79
It was demonstrated that the GAL was seismically isolated to 98 GAL.

[Brief description of drawings]

[Fig.1] Top view of seismic isolation device

[Fig. 2] Central sectional view of seismic isolation device

[Figure 3] Seismic isolation device configuration diagram

[Fig. 4] Seismic isolation device installation layout

[Explanation of symbols]

 1 Upper steel plate pedestal 2 Lower steel plate pedestal 3 Steel ball 4 Fixed vault hole 5 Column pedestal 6 Building column 7 Building foundation 8 Pitch seismic isolation device 9 Building structure

Claims (1)

[Claims] 1. This seismic isolation device is a device that is installed between a foundation (7) of a building or structure and a pillar (6) that supports the seismic isolation to isolate a rolling earthquake. 3) is a structure in which a parabolic circular steel plate pedestal (1) (2) with the center at the bottom is sandwiched from above and below, and the acceleration of a rolling earthquake is lower steel plate pedestal (2). The steel ball (3) rises and rotates on the parabolic gradient, the rising stress becomes a reaction force, the seismic acceleration is extinguished, and the structure on the upper steel plate pedestal (1) is isolated. Is.