Analysis of Seismic Impact of Improvements with Rigid and Semi Rigid RC Structure with Having Podium

Increase in population, urbanization and requirement of various infrastructure resulted into limited availability of suitable land for development. These has resulted into sharp increase in land cost. So, to take optimum use of land, multi-storey tower became popular. But to take financial leverage as well as to satisfy demand of larger commercial space near to road level and making building compliant to minimum parking space requirements for such mixed-use development according to prevailing bye laws Architects and Developers have come up with unique idea of Podium type Buildings. Tower-Podium type buildings are being quite popular now days, because they allow optimum use of land as well as financial leverage to satisfy demand of larger commercial space. Podium can be defined as part of structure whose lateral load resistance is more than that of tower. The backstay effect is a set of lateral forces developing within a podium structure to equilibrate the lateral forces and moment of a tower extending above podium structure. In this study to analyse Tower-Podium Structure CSI ETABS software is used. Different models are prepared by changing the no. of stories of podium and diaphragm conditions. After analyzing, it is observed that backstay effect increases with increase in podium floors and it is more in case of rigid than semi-rigid. So, it is inferred that Tower with 5 storey Podium and Rigid Diaphragm can resist more lateral forces than any other models