PLOTTING OF HAZARD CURVE FOR A CITY

Abstract

In the present era, earthquake has become a serious disaster. Proper designing of a building for earthquake must be done, otherwise it would to serious loss of life and property. Although complete safety fromearthquake cannot be ensured, as it would become highly uneconomical. But we can assure safety from earthquake up to some degree. It is highly uncertain to predict the occurrence of future earthquakes. Because occurrence of some earthquakes might be unexpected. Various methods like Probabilistic Seismic Hazard Analysis and Deterministic Seismic Hazard Analysis are developed but they both have their own merits and demerits. In this Thesis, Hazard is plotted for a cityusing USGS (United States GeologicalSurvey) method. USGS method plots the hazard curve for given edition, location, spectral period and site class. After that Fragility curve is being plot for a Reinforced Concrete 4-Storey building using Lognormal distribution.Lognormal function is a two parameter function i.e. mean and standard deviation. For plotting the fragility curve, incremental dynamic analysis was carried out in ETABS Software for 12 Ground Motions. Corresponding to the ground motions, IDA(IncrementalDynamic Analysis) curves are plotted. Fromthe IDA curves, Fragility curves were plotted corresponding to Immediate occupancy, Life Safety and Collapse Prevention damage states. After that I found the point of intersection of Hazard curve and Fragility Curve to predict the vulnerability of the Building under the earthquake.