This paper presents a work done on seismic performance of reinforced concrete structure and composite structure of G+10 and G+15 buildings in seismic zones III & IV . This paper focus on the R.C.C Structure and Composite Structure having different shapes of columns and their relative significance . The results are obtained on the basis of Story Drift , Story Displacement , Self Weight . The seismic performance of buildings having reinforced concrete structure and composite structure is comparable but the differences exist. Composite structure as on today was first used in both a building and bridges. as compared to R.C.C structure Composite structures are more famous due to Both speed and economy can be achieved in case of composite systems .Steel-concrete composite systems for buildings are form a bond with each other and they form a complete composite structure with the help of shear connectors etc.

Keywords : Composite steel concrete systems, Soft storey, Equivalent static method, Response spectrum method, Base shear. Shear connector, ETAB software. ratio, Displacement, Infill frame, Inter Storey, drift, Strut.