Abstract

RODRIGUEZ, Ali et al. Determination of response spectra considering cumulative damage and soil structure-interaction. Ing. sísm [online]. 2017, n.96, pp.18-38. ISSN 0185-092X.

In this study, the cyclic ductility of single degree of freedom systems with non-linear behavior representing earthquake-resistant structures was estimated considering the effect of cumulative plastic deformation demands and soil-structure interaction (SSI). Additionally, earthquake response spectra in terms of peak and cyclic constant ductility taking into account SSI were computed. To achieve the aims of the present study, several simplified systems were subjected to earthquake ground motions recorded at soft soils sites of Mexico City where a significant effect of SSI and cumulative damage have been observed. It was shown that cumulative plastic deformation demands have an important influence on the seismic behavior reducing the ductility capacity of structures and by the other hand increasing the spectral ordinates considerably. Finally, the impact of SSI depends mainly on the soil flexibility and could have beneficial or detrimental effects depending on the ratio of system and ground period, increasing or decreasing the response of a structure.

Keywords : cyclic ductility; cumulative damage; soil-structure interaction.

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