Author(s)

A. Tena-Colunga, L. Gomez-Soberon

Abstract

Importance of eccentricities in the superstructure on the torsional response of base-isolated structures A. Tena-Colunga', L. Gomez-Soberon^ ' Universidad Autonoma Metropolitana, Mexico *N ''Alonso y Asodados, Mexico Abstract The torsional response of base-isolated structures when eccentricities are set in the superstructure is presented. Nonlinear dynamic analyses were used to study peak responses for different ratios of the static eccentricities (ej between the center of mass and the center of rigidity for the superstructure. Unidirectional and bidirectional actions of selected ground motions typical of firm soils of the Mexican Pacific Coast were used in the study. An effective period range between 1.5 and 3.0 seconds (1.5s Keywords