Multiple support response spectrum analysis

[vttrlc]

Multiple support response spectrum analysis of bridges

A comprehensive investigation of the Multiple Support Response Spectrum (MSRS) method for seismic analysis of bridges and other multiply supported structures is presented. The method accurately accounts for the spatial variability of ground motions, including the effects of incoherence, wave passage, and spatially varying site response. The structural response is obtained in terms of response spectra and peak displacements at individual support degrees of freedom, and a coherency function that characterizes the three spatial variability effects. Special attention is given to the effect of site response arising from variation in the soil conditions at different supports of the structure. Through extensive comparisons with time history analysis, the validity of the MSRS rule and the site response component of the coherency function are established. Methods for estimating the site frequency response function, needed in the coherency model, are developed and examined. These models and rules are implemented in the MSRS code for application to three-dimensional, multiply supported structures. Using the MSRS code, extensive parametric studies are performed for two example bridge structures.

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[kowheng]

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