Comparative Study on Seismic Behaviour of Composite and RCC plan Irregular Structures

Abstract

This paper investigates comparison of a composite structure with concrete filled steel tubular columns, a composite structure with concrete encased I section columns and a RCC structure. All the models considered are G+15 storey and are irregular in plan and the irregularity condition as per IS 1893-2002 is satisfied resulting in T shape and Plus Shape models. It was observed after performing response spectrum analysis on the models that the stiffness is less in composite structures when compared to RCC structures. The displacements and drifts are less in RCC structures owing to larger value of stiffness but are within the permissible limits. The base shear and base moments are found to be less in composite structures due to the fact that the dead weight of composite structures is less compared to RCC structures. There is no significant difference in the response parameters of the two composite structures.