Method and apparatus for determining seismic vulnerability of a

Details Method and apparatus for determining seismic vulnerability of a Method and apparatus for determining seismic vulnerability of a

1996-06-20

1997-09-02

Chapman, John E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73594, G01M 702

Patent

active

056635010

ABSTRACT:
In order to determine the seismic vulnerability of a structure, a vibration sensor is placed on each of the top surface of a layer of the structure and the ground surface near the structure so as to record vibrations. A seismic vulnerability data processor assumes a transfer function of vibration of the top surface of the layer of the structure based on a spectral ratio between the vibration recorded on the top surface of the layer of the structure and the vibration recorded on the ground surface, thereby obtaining a predominant frequency and amplification factor of vibration of the top surface of the layer of the structure. A seismic vulnerability index of the layer of the structure resulting from a deformation of the layer is obtained based on the obtained predominant frequency and amplification factor of vibration of the top surface of the layer of the structure and on the height of the layer of the structure. This seismic vulnerability index is multiplied by an assumed seismic acceleration so as to obtain a maximum shear strain of the layer of the structure upon being subjected to an earthquake.

REFERENCES:
patent: 5255565 (1993-10-01), Judd et al.
patent: 5578756 (1996-11-01), Nakamura et al.

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