Investigation of Hydrodynamic Eects on Linear and Nonlinear Earthquake Responses of Arch Dams by the Lagrangian Approach

The linear and nonlinear responses of a selected arch dam subjected to earthquake ground motion are presented in this study. The hydrodynamic eects on the dynamic response of arch dams are investigated us-ing step-by-step integration by the Lagrangian approach. The foundation flexibility eects on dam response are also examined. Water in the reservoir was represented by 8-noded Lagrangian fluid nite elements. The element including compressible behavior and surface sloshing motion of the fluid has been coded and incor-porated into a general-purpose computer program, NONSAP. In this study, the curve description method describes the nonlinear behavior of the dam concrete. The El-Centro N-S component of the Imperial Val-ley earthquake, on May 18, 1940, has been used as the ground motion. The response of the dam was characterized by crest displacements and envelopes of maximum tensile stresses