Effect of base-rock characteristics on non-linear seismic respons of concrete gravity dams including dam-foundation interaction

Dam interaction with foundation is important subject in analys of concrete gravity dams , so always needed to new methods for improved and examined accuracy than last methods and caused to more recognition of behavior of dams for analysing and designing . The influence of base-rock characteristics on non-linear seismic response to different earthquake input mechanims including dam-foundation interaction is investigated by using the lagrangian approach in this paper. The elasto-plastic behavior of the dam concrete is idealized. Dam and foundation rock are modeled by using 8-noded isoparametric quadrilateral solid Finite-elements. In this paper ,two different earthquake input mechanisms are used to consider the effect of base-rock characteristics in the analyses: the standard rigid-base input and the massless-foundation input models . A concrete gravity dam with results of recorded from earthquake is chosen for testing numerical model. The results obtained from non-linear analyses are campared with the results of linear analyses

Keywords:

Dam-foundation interaction , Concrete gravity dam , Lagrangian approach , Finite elements , Earthquake input mechanisms