| Summary: | The purpose of this article is to contribute to the study of the seismic behavior of structures interacting with the ground and to offer new tools for the treatment of relevant problems, oriented towards the new seismic design philosophy of structures: the design performance-based design. The issue is part of the proposal for simplified models to address a complicated problem such as soil-structure interaction (ISS). The nonlinear behavior of the structure is determined by a capacitive approach based on the seismic performance such as the N2 method proposed by Peter Fajfar. In its original version, this method considers that the structure is fixed at its base, neglecting the ISS. Our contribution will be to make some modifications to this approach to introduce the effect of the soil on the nonlinear response.
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