Mechanical effects of excavation rebound of arch dam bedrock and better concreting time of dam body  

作　　者：WU ZhongRu GU YanChang SU HuaiZhi GUO HaiQing 

机构地区：[1]College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China [2]National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety,Nanjing 210098,China [3]Hydraulic Research Institute,Nanjing 210029,China

出　　处：《Science China(Technological Sciences)》2009年第2期513-517,共5页中国科学（技术科学英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos.50539110,50809025,50539010,50579010,50539030);the Science and Technology Support Plan (Grant Nos.20006BAC14B03,2008BAB29B03)

摘　　要：In this study, a nonlinear model is presented for analysis of damage-cracking behavior in arch dams during strong earthquakes using different seismic input mechanisms. The nonlinear system includes a plastic-damage model for cyclic loading of concrete considering strain softening and a contact boundary model of contraction joint opening. Two different earthquake input mechanisms are used for comparison, including massless foundation input model and viscous-spring boundary model considering radiation damping due to infinite canyon. The results demonstrate that effects of seismic input mechanism and radiation damping on nonlinear response and damage-cracking of the dam are significant. Compared with the results of using massless foundation input model, the damage-cracking region and contraction joint opening are substantially reduced when using viscous-spring boundary model to take into account radiation damping. However, if the damping ratio of the dam is artificially increased to about 10%–15% for massless foundation input model, the joint opening and damage-cracking of the dam are comparable to the results obtained from the viscous-spring boundary model.

关 键 词：REBOUND DEFORMATION MECHANICAL EFFECTS DEFORMATION modulus BETTER concreting TIME 

分 类 号：TV642.4[水利工程—水利水电工程]