Non linear analysis of soil liquefaction phenomena in the cariaco basin (venezuela)

Abstract eng:
As a first approach to account for site effects on the behaviour of collapsed structures during the Cariaco Earthquake of 1997 in Venezuela, a simplified soil profile was modeled with a finite element code. The soil response at the surface was estimated, by considering the elastoplastic soil behavior, using several synthetic input motions. Results show that liquefaction phenomena must have occurred and show a modification on the frequency contents due to the filtering produced by the non linear behaviour of the soil. The obtained free field signals are then applied at the base of a simplified structural model in fixed base condition, and the structural analysis provides a preliminary idea of the demand of ductility during the seismic motion.

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