Method and apparatus for evaluating soundness of block-like stru

Details Method and apparatus for evaluating soundness of block-like stru Method and apparatus for evaluating soundness of block-like stru

1995-04-18

1996-11-26

Chapman, John E.

Measuring and testing

Vibration

By mechanical waves

G01M 702

Patent

active

055787568

ABSTRACT:
The soundness of a block-shaped structure is evaluated by disposing one set of at least two three-way sensors on a structure, measuring microtremors, determining the contribution factor of rocking vibration, which occupies part of overall vibration, based upon the results of microtremor measurement, and determining extent of rocking vibration at an arbitrary position of the block-shaped structure based upon the contribution factor. Rocking vibration becomes more prevalent as the state of support afforded by the block-shaped structure becomes more unstable. Accordingly, if rocking vibration becomes dominant and exceeds unity, this fact can be used to evaluate the soundness of the block-shaped structure to collapse.

REFERENCES:
patent: 4164149 (1979-08-01), Okubo
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patent: 5161521 (1992-11-01), Kasahara et al.
patent: 5225565 (1993-10-01), Judo et al.
RTRI Report, vol. 8, No. 5, 1994, May Nakamura et al., "On a New Method for Piers Inspecting Using Microtremors."5
Lorusso & Loud

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