Method to Estimate Equivalent Natural Period with Micro-tremor Measurements

Munemasa TOKUNAGA; Masamichi SOGABE; Fumiaki UEHAN; Hiroyuki TANIMURA; Yoshitaka MURONO; Kiyoshi ONO

doi:10.2219/rtriqr.53.21

PAPERS

Method to Estimate Equivalent Natural Period with Micro-tremor Measurements

Munemasa TOKUNAGA, Masamichi SOGABE, Fumiaki UEHAN, Hiroyuki TANIMURA, Yoshitaka MURONO, Kiyoshi ONO

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Keywords: micro-tremor measurement, equivalent natural period, natural period, modal identification, Eigensystem Realization Algorithm, nonlinear analysis

JOURNAL FREE ACCESS

2012 Volume 53 Issue 1 Pages 21-27

DOI https://doi.org/10.2219/rtriqr.53.21

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Abstract

The object of this paper is to propose a method to estimate the equivalent natural period with micro-tremor measurements on the basis of the correlation between the natural frequency and the yield frequency. A method, combining the Eigensystem Realization Algorithm and some empirical hypotheses of vibration modes, was proposed for identifying the first natural vibration modes of structures. A ratio of the yield frequency to the natural frequency was mostly a certain constant value and the average value of the ratio depends on the type of structures. This paper proposes a simple procedure for estimating the yield frequency with micro-tremor measurements.

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