Response Spectrum Analysis of Long-span Bridge for Multi-supported Seismic Excitations

摘要

An improved response spectrum method is proposed for seismic analysis of multi-supported structural system. The improved method only depends on the uncoupled modes of structural system and on the characteristics of wave propagation phenomenon. The spectral parameters are defined and the approximate analytical formulae of these spectral parameters are presented. The proposed method is validated by numerical example of a three-span continuous stiff-frame bridge, and the results analyzed by the proposed method are shown in good agreement with that analyzed by Der Kiureghian's MSRS method.