Seismic Appraisement of Building with Silt Floor Using Composite Column

Abstract

This paper investigates the effects of providing steel–concrete composite column at soft-storey level in place of a reinforced concrete column. The main parameters include the storey displacement and drift, base shear, axial force, shear force and bending moment. The linear and nonlinear analysis are used to assess the seismic response of the building using steel–concrete composite columns at the soft-storey level. For linear analysis, the response spectra method (RSA) is used, and for nonlinear analysis, time history method (THA) is used. The analytical work was conducted by considering the three different analytical models and modelling infill walls as an equivalent strut approach. The analysis is performed using finite element software SAP2000. The results obtained indicate that the replacement of soft-storey reinforced concrete columns with steel–concrete composite columns is possible because of higher strength and efficiency of a steel–concrete composite column. It is strongly recommended to provide steel–concrete composite column at the level of soft-storey to increase the performance of the silt floor.