Seismic fragility assessment of concrete gravity dams under near source synthetic ground motions

This study aims at seismic fragility assessment of concrete gravity dams under synthetic near source ground motions. The numerical modelling of the dam-reservoir-foundation coupled system and the nonlinear time history analysis are carried out in ABAQUS. Two sets of synthetic near source records characterized by forward-directivity and fling-step effects are generated using an empirical stochastic approach. Maximum value of the seismic response quantities of the coupled system are obtained as engineering demand parameters (EDP) and various ground motions parameters are selected as intensity measurement (IM). Fragility functions are generated from the cloud response data (EDP-IM pairs) using a Probabilistic Seismic Demand Model (PSDM).