Seismic Soil Structure interaction for Shear wall structures

Marwan Sadek,Bassem Ali,Ahmed Arab,Fadi Hage Chehade,F Hage Chehade

doi:10.1051/matecconf/201928102006

Abstract

For soft soil subjected to earthquake loading, the soil non linearity could significantly amplify the ground motion. This paper presents a 3D numerical study on the influence of soil non linearity on the seismic soil structure interaction for shear wall structures. Numerical simulations are conducted for both elastic and elastoplastic behaviour for the soil. Real ground motions records are used in the study. The analysis is focused on the seismic induced response of the soil and the structure in terms of displacement and velocity. The results show that considering elastic model for the soil behaviour is not sufficient and could significantly affect the seismic induced response of the system.

Highlights

Comparison between the conventional code design spectra and the actual response spectra show that higher values of natural period do not necessarily contribute to a smaller response, ; the dominant assumption about the beneficial role of SSI in the structural engineering point of view represents a rough simplification correspondingly leading to an unsafe design [1, 2]
It is clear that the soil structure interaction has a great impact on the flexible base frequency of the structure
This paper included a numerical analysis on the effect of the soil model on the seismic response of structures braced with shear walls and on the soil-structure interaction phenomenon

Summary

Introduction

Comparison between the conventional code design spectra and the actual response spectra show that higher values of natural period do not necessarily contribute to a smaller response, ; the dominant assumption about the beneficial role of SSI in the structural engineering point of view represents a rough simplification correspondingly leading to an unsafe design [1, 2]. A full 3D time history analysis of SSI has been applied on this bridge using the direct approach by considering the soil and structure nonlinearities. Two main behaviors could be identified for bracing systems in building structure: frames and shear walls (see Fig 1). The difference between these two systems was investigated by several researchers [9, 10]. This papers present a 3D numerical investigation about the influence of soil behaviour on the seismic soil structure interaction in case of shear wall structure. The survey is carried out using the FLAC3D program which has been successfully used to analyze several problems of soil dynamics in both linear and nonlinear domains [11, 12]

Problem under consideration

Dynamic characteristics

Comparison of linear and non-linear seismic response

Conclusion