LAUSR

Seismic hazard assessment is essential for carrying out safe and economic design of structures. The different zone factors corresponding to seismic hazard in different parts of India that has been mentioned in the IS code (IS 1893: 2002). The damages caused by earthquakes recently in northern India have indicated that seismic zonation may not be accurate. The uniform ratio of maximum considered earthquake (MCE) to design basis earthquake (DBE) is assumed as 2 in the IS codes, thus leading to non uniform margin of safety at MCE level ground motions. The probabilistic seismic hazard assessment based on these issues is discussed. For testing earthquake resistant building models ground motion records are necessary input in the analysis. Time history records of India for different peak ground accelerations were used in the analysis. The model analyzed using the software ETABS, Response Spectrum Analysis, Time History Analysis (linear & non-linear) were carried out for maximum considered earthquake(MCE) zone factor & design based earthquake (DBE) zone factor as per codes. In this article, analysis were performed on a 10 storey RCC building model for seismic zones IV & V (0.24g & 0.36g) for MCE and (0.12g & 0.18g) for DBE respectively. The peak ground acceleration produced for the extreme scenario by a M7.5 earthquake corresponds to the maximum PGA estimate of 0.63g.