Application of an efficient stochastic calculation method on the seismic analysis of an isolated structure

Abstract

An isolated structure often possesses distinct non-proportional damping characteristics. However, traditional seismic calculation theory and methods are derived based on the assumption that damping is proportional. Based on this drawback, a new, more efficient stochastic calculation method, an improvement on the pseudo-excitation method, is introduced. This method is then applied to the seismic analysis of an isolated structure. By comparing it with the forced decoupling, matrix inversion and iteration methods, it is shown that the presented method can produce accurate results while increasing the efficiency of the stochastic analysis. Moreover, the calculation process of the seismic response of an isolated structure is convergent. Based on the results of the example presented in this paper, the given method is applicable to the seismic analysis of an isolated structure and can be utilized in practice.

Keywords

isolated structure / stochastic response / non-proportional damping / efficient / accurate / pseudo-excitation method

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Acknowledgements

The authors gratefully acknowledge the financial support of this work, which was provided by the National Natural Science Foundation of China (Grant No.50938008, 51108466), the National Science Foundation for Post-doctoral Scientists of China (Grant No.20110491277), the Science Foundation for Post-doctoral Scientists of Central South University.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg