Abstract
Different nonlinear behaviors will be predicted by different fracture methods. For this purpose, both the extended finite element method (XFEM) which has been widely used for the analysis of crack growth, and the concrete damaged plasticity (CDP) model including the strain hardening or softening behavior are proposed for the seismic fracture response of concrete gravity dams with considering the effects of dam-reservoir-foundation interaction. The reservoir water is modeled using two-dimensional fluid finite elements by the Lagrangian approach. The Koyna gravity dam is selected as a numerical application. The validity of the two algorithms is discussed by comparing results obtained from the proposed procedures with those reported in the literature. Cracking process and final crack profile of the Koyna gravity dam using the XFEM and CDP model are compared. Nonlinear dynamic response of the selected concrete dam is performed. The applicability and the suitability of the two procedures for seismic cracking analysis of gravity dams are discussed.
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