Influence of Reduction of Dynamic Shear Modulus on Seismic Tensile Stress of Arch Dam

Abstract

In order to verify seismic performance of arch dam, it is necessary to evaluate stresses within dam during earthquake. When evaluating against strong earthquake motion, it is necessary to set the values and to consider the nonlinearities of dynamic deformation properties. Here, we examined the effects of reduction of dynamic shear modulus on earthquake stresses of dam by 3-D dynamic analysis. As a result, the tensile stresses during earthquake generally showed a tendency to decrease as the value of dynamic shear modulus decreased, but the tensile stresses around the connection area between dam and thrust block increased. Since the increase of tensile stress during earthquake was shown in the part of dam body and abutment, it is necessary to pay attention to the stress increases during earthquake in the seismic performance evaluation.