Dynamic Analysis of Dam-Reservoir-Intake Tower Considering Sediments Absorption

In this paper, dam-reservoir-intake tower system with interior water of tower are analyzed using finite element method considering sediments absorption. Reservoir is modeled by Lagrangian approach and effect of sediments absorption on responses of dam-reservoir-intake tower is considered. Three types of sediments and also distance between dam and tower are determined for parameter study. Dynamic analysis has been performed under horizontal and vertical excitation of Northridge and Tabas earthquakes. Results show that increasing distance between dam and tower, can increase frequencies of dam-reservoir-intake tower system. Also in models with rigid sediments, the frequencies of system are alittle more than model with two other kind of sediments. Dynamic responses show that increasing the distance between dam and tower reduce the effects of sediments on the dam and tower responses. It is concluded that the maximum displacements of dam crest and principal stresses of dam heel increase by increasing distance between them. In time domain responses, displacements of dam crest and principal stresses of dam heel increase in rigid sediments but sediment type has fewer effects on tower responses specially on displacements.