Comparative study of endurance time and time history methods in seismic analysis of high arch dams

In the present study, the application of endurance time analysis (eta) method is investigated on seismic analysis of a higharch dam. in this method the coupled system is excited using the predesigned intensifying acceleration functions instead of thereal ground motions. finite element model of an arch dam considering the dam-rock-water interaction effects was developedin which the concrete and rock were assumed to have linear elastic behavior. the effect of the large displacement in dam bodywas considered in numerical model using co-rotational approach. the coupled system was analyzed by conventional timehistory analysis (tha) method in various seismic performance levels and the results were compared with those obtained frometa at the equivalent target time. it was found that eta method provides the close results to tha with acceptable accuracywhile it reduces the total time of the analyses considerably.