Proposal of the Multi-modal N2-SSI method to study higher modes effect on the nonlinear response of SSI system

Meriem ZOUTAT, Mohammed MEKKI, Sidi mohammed ELACHACHI

Abstract


The present study consists in describing and applying a new approach called N2-SSI Multi-modal to study the effect of higher modes on the nonlinear seismic response of soil structure interaction (SSI) systems. The two essential parameters in performance-based design considered in this study are lateral displacement and inter-story drift.  The proposed method consists in applying N2-SSI method (which takes into account only one vibration mode) to a considerable number of vibration modes. The results found were compared with those obtained by other methods to assess its reliability. We also showed through this approach, that it was not reasonable to take a single seismic behaviour factor for all modes.

Keywords


Higher modes; Soil structure interaction; N2-SSI method; Pushover analysis

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