Vulnerability Assessment of RC Building by Incremental Dynamic Analysis Approach

Vulnerability assessment of existing RC building subjected to earthquake excitations can be used as an effective tool for understanding the seismic response of building. Incremental dynamic analysis (IDA) offers an efficient method to nonlinear dynamic structural analyses for accurate estimation of seismic performance of structures under earthquake ground motions. This study summarizes the evaluation of fragility curves for a reinforced concrete frame structure using incremental dynamic analysis approach considering variability of ground motion. A detailed review of literature on incremental dynamic analysis and fragility curve is presented. The detailed model of two-story RC building is generated, and nonlinear time history analysis is performed to assess the performance under seismic excitation. The variation in ground motion is considered by using three sets of earthquake data to evaluate response of the structure and IDA curves are obtained. These curves are then operated by fragility evaluation procedure to obtain fragility curves at different damage limit states. From the fragility curves, prediction on the probability of exceedance of different damage states under seismic excitations is made.