Soil-Foundation-Structure Interaction Effects in Seismic Behaviour of RC Elevated Water Tank

Abstract

Presented here is an analysis of the effects of soil-foundation-structure interaction (SFSI) on seismic response of elevated water tanks. A particular importance is the issue of water motion inside the container, input motion with scaling and approaches for the SFSI models. Time history analysis is carried out for more realistic seismic analysis considering water as two- mass idealization and subsoil data of three different sites of Ahmedabad, metropolitan city of India using finite element software SAP2000. The analysis presented in this paper addresses the influence of inelastic behavior of both the soil and the structural components during seismic response evaluation of elevated water tank systems. Additionally, it is also demonstrated that that SFS interaction can sometimes have a beneficial effect on the superstructure response and sometimes produce detrimental effects on the system behavior and is dependent on the water filled-up in container and sub soil condition below the base. Finally, study reflects the importance of soil base parameters for the analysis and result shows that the structure responses are exceedingly influenced by water level inside the container of tank, different subsoil condition and approaches considered.