地基辐射阻尼和库水对拱坝非线性地震响应的影响

Effects of foundation radiation damping and reservoir level on arch dam nonlinear seismic response

针对拱坝坝体-地基-水库系统的动力计算分析,采用考虑无限地基辐射阻尼、坝体横缝非线性和自由场输入的模型程序,以溪洛渡拱坝为工程实例,对不同库水位下,考虑或不考虑地基辐射阻尼的工况进行了系列的计算对比研究。研究结果显示,低水位是横缝开度控制工况,高水位是坝体应力控制工况;对所有水位,地基辐射阻尼都带来坝体地震响应的全面降低,但不影响反应的总体规律。

The dynamic analysis of damfoundationreservoir system of an arch dam was performed in this paper, using a numerical model considering infinite foundation radiation damping and contraction joints' nonlinearity and freefield earthquake input. A series of calculating cases were studied with or without foundation radiation damping under different reservoir water levels. The results showed that the low water level is the controlling case for the joints opening, while the high water level is the controlling case for the dam stresses. Under each water level, the foundation radiation damping brings overall reduction of the dam body's earthquake responses, while having no noticeable effect on the response patterns.