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Analysis of damage and cracking in arch dams subjected to extremely strong earthquake

PAN Jian-wen,WENG Jin-ting,ZHANG Chu-han(Tsinghua University,Beijing 100084,China)  
The plastic damage model of concrete is applied to analyze the cracking of the Dagangshan double curvature arch dam under the action of extremely strong earthquake,in consideration of the softening behavior of tensile strain.Nonlinear FEM with refined mesh is adopted and the nonlinear effect of the transverse joints is taken into account.The time domain method is used to analyze the form of failure and the development of cracking following the time history of the earthquake.The result shows that the damage index may reach 0.9 and the failure may occur to the upper cantilever portion of the dam when subjected to an extremely strong earthquake with PGA=0.56g.The displacement response and the opening of contraction joints will significantly increase.Consequently,the strengthening measures for ensuring the safety of dam are necessary.
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