地基边界对五嘎冲拱坝地震动力响应的影响  

Effect of foundation boundary on earthquake dynamic response of Wugachong arch dam

作　　者：陈平[1] 何蕴龙[1] 陈海霞[2] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]国电四川阿坝水电开发有限公司,四川成都610041

出　　处：《武汉大学学报（工学版）》2011年第5期554-559,共6页Engineering Journal of Wuhan University

摘　　要：采用时程法计算了五嘎冲拱坝在考虑地基辐射阻尼的粘弹性边界模型与传统的无质量地基固定边界模型的地震动力响应,对大坝的加速度、动应力特征进行了分析,通过对2种模型的对比,总结出拱坝在考虑地基辐射阻尼情况下的动力响应规律.结果表明:等效荷载的地震动输入方式及用粘弹性边界模拟地基辐射阻尼在三维计算中是可靠的,除部分特征点外,地基辐射阻尼能有效地减小拱坝的地震响应,这对拱坝抗震计算具有一定指导意义.Dynamic response of Wugachong arch dam with timehistory method is analyzed.The viscoelastic boundary model considering the foundation radiation damping has been compared with the no mass foundation and fixed boundary model without considering the foundation radiation damping.The feature of dam＇s acceleration and dynamic stress have been analyzed.Based on the comparison of the two model,the dynamic response rule of arch dam has been summarized considering the foundation radiation damping.The results show that the ground motion input method with equivalent load and the viscoelastic boundary is reliable in threedimentional calculation.Besides some characteristic points,the foundation radiation damping can reduce dynamic response of arch dam effectively;it has some guiding significance to aseismic design of arch dam.

关 键 词：五嘎冲拱坝 粘弹性边界 固定边界 动力响应 

分 类 号：TV314[水利工程—水工结构工程]