Derivation of Analytical Fragility Curves for RC Buildings Based on Nonlinear Pushover Analysis

Fragility curves are widely used in estimation of various damage states that may occur in buildings during possible earthquakes. In this study, analytical fragility curves are derived by considering architectural and structural details of three to eight story reinforced concrete buildings, which constitute the major part of the existing building stock in the city of Izmir and are used for residential purpose. Nonlinear static analyses are performed by generating 3D models of the buildings. Spectral displacement demand of the buildings is determined for different earthquake levels, which are defined in the Turkish Seismic Design Code-2007. Four limit states are defined for each building class in terms of spectral displacement. The fragility curves, which reflect general characteristics of the existing building stock and are expressed in the form of two-parameter lognormal distribution functions, are presented as an outcome