عنوان مقاله [English]
In this paper, application of the Endurance Time (ET) method in seismic analysis of concrete gravity dams has been investigated. This relatively new method is based on a time history analysis procedure and it is expected that, by extending its application to the seismic analysis of dams, useful information about seismic performance and safety margins based on various design criteria, can be obtained. A comparison of the analysis results for the Koyna and Folsom dams in a linear phase under different earthquakes has shown that the ET method has the potential of predicting dam behavior under earthquakes. In order to investigate the general performance of a dam at the OBE level in a linear range, the target time can be selected as the equivalent OBE of the proposed site. If the value of the intended damage index exceeds the limit value at target time, the dam design is considered inadequate and, if it does not exceed the limit value, the dam is considered adequate. In general, the ET method simplifies the procedure of the seismic assessment of concrete gravity dams.