非定常地震応答の自乗平均値の積分値の近似計算法

概要

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The response of the structure subjected to nonstationary random vibration such as earthquake excitation isnonstationary random vibration. Calculation method for statistical characteristics of such a response is complicated.Practical and simplified method to obtain theoretical statistical value is required. Mean square value of the response isusually used to evaluate random response. Integral of mean square value of the response corresponds to total energy ofthe response. In this paper, a simplified calculation method to obtain integral of mean square value of nonstationaryseismic response is proposed. The structure is modeled as a single-degree-of-freedom system. Nonstationary white noiseis used as input. Integral of mean square value is obtained for some value of the damping ration and the natural period. Itis found that the proposed method gives exact value of integral of mean square value of the response.