【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.更多还原

【Abstract】 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.更多还原