Seismic Fragility Curves and Damage Probabilities of Concrete Gravity Dam Under Near-Far Faults Ground Motions

摘要

Dams are very costly structures that are often built in areas prone to seismicity due to geological and geomorphological considerations. To protect such structures against seismic actions, in-depth studies on their vulnerability should be undertaken. This study deals with the seismic vulnerability of a concrete gravity dam. The Oued El Fodda dam on the Oued Chelif River, west Algeria, is considered as a case study. The dam is studied under near- and far-fault ground motions. To derive fragility curves, non-linear time history analyses are performed by using a Latin hypercube sampling numerical simulation procedure. Damage probabilities are determined for each defined limit state. The results show the vulnerability of the dam under high-level seismic motion. A sensitivity analysis was performed to evaluate the influence of uncertain parameters on structural responses. The most important parameters are then identified.