Abstract
Three-dimensional dynamic cracking propagation analysis was conducted to evaluate seismic safety of concrete gravity dams, since seismic response of the dams were strongly affected not only riverbed rock but also abutment of base rock. Analytical models were constituted by reservoir, base rock and dam body using smeared crack model. Crack pattern, crack propagation and failure pattern of dam body were discussed comparing those obtained from two-dimensional analysis. It was realized that the results for crack pattern and propagation based on three-dimensional analysis would be more acceptable than those based on two-dimensional analysis. Moreover, residual ligament height defined from crack propagation was newly introduced for index of earthquake-resistant safety concerning utilization of reservoir. The relationship between residual ligament height and input acceleration was investigated to evaluate seismic safety of concrete gravity dams.
