Seismic Analysis and Soil Structure Interaction of Multistoried Building with Different Types of Footing

Abstract

Seismic Analysis of building is very much important in the present scenario. Post earthquake study of the structures reveals an idea about the behaviour of the structure to seismic forces and their damage. Numerical Analysis is a powerful tool in the analysis of structures which predict the possible settlements and deflections related to seismic loads so as to design the structure safely. In addition it is seen that the interaction of soil and foundation plays a major role in the damage/response of structure. Foundation is that part of structure to transmit loads from structure in to the subsoil. In order to study the effect various type of foundation in the behaviour of building to seismic forces, a thirteen storey structure is modeled in ANSYS 16. The structure is resting on three layers of soil such as sand, clay and stiff clay. Three types of foundation such as raft, pile and under reamed pile are considered for the comparison of the study keeping all other parameters constant. On comparing the values of total lateral deflection of the building it is found that the structure with raft foundation shows maximum lateral deflection, than pile foundation and minimum is with the under reamed pile foundation. The settlement of footing is also observed. The settlement obtained under raft foundation concrete is greater than that of pile foundation. The soil settlement under pile foundation is slightly higher than that of under reamed pile foundation.