Abstracto

Performance Based Seismic Design of Reinforced Concrete Building

Dr. Rehan A. Khan

The basic concept of Performance Based Seismic Design is to provide engineers with the capability to design buildings that have a predictable and reliable performance in earthquakes. Performance based Seismic design is an elastic design methodology done on the probable performance of the building under input ground motions. The present study is an effort to understand Performance Based Design Approach. In this, a five storey symmetrical building is designed using STAAD.Pro and the performance based seismic design is performed by N2 method using a simple computer-based pushover analysis technique using SAP2000, a product of Computers and Structures International. The procedure compares the capacity of the structure (in the form of a pushover curve) of a MDOF system with the demands on the structure (in the form of inelastic response spectra of a single degree freedom system). The method is formulated in acceleration displacement format. The graphical intersection of the two curves approximates the performance point of the structure. The proposed method is illustrated by finding the seismic performance point for a five storey reinforced concrete framed building located in Zone-IV, symmetrical in plan (designed according to IS 456:2002) subjected to three different PGA levels as input ground motion. An extensive parametric study is conducted to investigate the effect of many important parameters on the Performance point. The parameters include effect of input ground motion on performance point, changing percentage of reinforcement in columns, size of columns, beams individually.The results of analysis are compared in terms of base shear and storey displacements.