Stochastic seismic analysis of structural systems vibrating under spectrum compatible excitations

Abstract eng:
Seismic assessment of linear behaving systems is usually performed adopting the well-known modal analysis along with modal truncation of higher modes. However, in the case in which the contribution of higher modes is not negligible, modal correction methods have been introduced to improve the accuracy of the dynamic response, for both deterministic and stochastic input. In literature fewer contributions than the deterministic case have been devoted to stochastic field. Aim of this paper is to propose a new computationally competitive method for the seismic analysis of linear behaving system vibrating under nonstationary Gaussian excitations. The method is based on the extension of the MAM for the evaluation of the nonstationary response spectral moments. In this regard the evolutionary spectrum compatible ground motion model recently proposed is used for modeling the nonstationary seismic process. Numerical results from the study of a large MDOF structure show the accuracy and the efficiency of the proposed technique.

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