To the question of Liaoning Shenwo concrete gravity dam seismic resistance

using the coupled Lagrangian-Eulerian finite element analysis technology

and then a typical seismic analysis numerical model of overflow dam considering reservoir water-dam-bedrock dynamic coupling effect was set up.In the numerical model

the equivalent uniform viscous-elastic boundary and the dispersion of concrete cracks constitutive model were used to simulate artificial truncated boundaries of the bedrock and the dynamic performance of the concrete material

respectively.The input acceleration peak value of reservoir dam seismic design was determined according to the relationship between the intensity and ground motion.The basic features of dam seismic response were analyzed under the conditions of water level changed in different seasons.The research shows:the earthquake fortification intensity of the undamaged overflow dam reachesⅧ.No matter fat dam or thin dam

the peak dynamic displacement occurs at the crest into the water

but the value of the fat dam is bigger.For the fat dam

the maximum tensile stress appears at the junction of the pier and overflow weir.For the thin dam

the maximum tensile stress appears at the dam toe under the condition of the water in the reservoir

on the contrary

the maximum tensile stress appears at the junction of the pier and overflow weir under the condition of no water in the reservoir.