Nonlinear Seismic Fragility Analysis of RC Framed Structure Using Incremental Dynamic Analysis

Abstract This study presents a comprehensive assessment of the seismic performance of framed structural systems through the application of nonlinear dynamic analysis techniques. The methodology involves subjecting a structural model to a series of ground motion records, each scaled progressively to simulate increasing seismic intensity levels. This approach enables the evaluation of structural behavior across a broad range of performance states, from initial elastic response to ultimate collapse. Critical engineering demand parameters, such as inter-storey drift and base shear, are tracked throughout the analysis to characterize the development of structural damage. Based on the dynamic response data, analytical fragility curves are constructed to quantify the likelihood of exceeding predefined damage states under varying seismic intensities. These curves serve as a probabilistic tool for identifying potential vulnerabilities and for estimating seismic risk. The outcomes contribute valuable insights into structural reliability under earthquake loading and support the implementation of performance-based assessment frameworks. By integrating contemporary analytical procedures and recent developments in seismic evaluation, the study enhances the accuracy and applicability of fragility-based approaches in structural engineering.