2D and 3D seismic damage analysis of concrete gravity dam
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Abstract
This study focuses on the 2D and 3D nonlinear seismic damage analysis of a proposed concrete gravity dam using the finite element program ABAQUS, employing the concrete damaged plasticity model. To compare the 2D and 3D analyses, four different cases of the dam's spillway section are simulated. Initially, a frequency analysis is performed to estimate the damping parameter. Subsequently, seismic analysis is conducted using simulated ground acceleration motion. The time history of relative displacement between the crest and base of the dam is recorded, and the maximum values and their occurrence times are compared. Additionally, the tensile damage distributions over the dam at specific time instants during the ground motion period are analyzed to examine the initiation and evolution of the damage. The results indicate that while the plane-stress assumption yields similar outcomes in terms of maximum relative displacement and final damage distribution when compared to the 3D analysis, there are notable differences in natural frequency and the timing of the first crack, second crack, and maximum relative displacement.
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