Pushover Analysis of MDOF System with SSI Effects and According to FEMA 440

Abstract

This paper discusses the analysis of soil-structure interaction using Displacement Modification Method, which was developed within the concept of FEMA 440 regulations. This method belongs to a group of static seismic methods, and uses the model of nonlinear behaviour of structures. To assess the effects of soil-structure interaction applied multi-parametric analysis of kinematics and damping effects of the ground or soil. The research was conducted also, on a model where the impact of introducing foundation structure and soil. The soil is modeled as a homogeneous, elastic, isotropic half-space (HEIS), while the connection of foundation structure-HEIS achieved using contact gap elements. In all analysis were introduced development of geometric nonlinearity, while development of material nonlinearity introduced by the concentrated plastic hinge model.