辐射阻尼与峡谷自由场分布对拱坝动应力的影响

Effects of radiation damping and spatial variation of free field on dynamic stresses of arch dams

利用频域边界元－无限边界元与时域有限元在时域内耦合而建立的耦合 模型能够较好地模拟拱坝地基的辐射阻尼，并能考虑峡谷自由场幅值、相位 的空间分布对拱坝动力响应的影响．本文利用该模型分析了谐波作用下拉西 瓦拱坝的动应力，并通过比较计算，研究了上述因素的影响，得到了一些有实 际意义的结论．

A hybrid model presented by the authors, which couples frequency domain boundary elements (BE)-infinite boundary elements (IBE) with time domain finite elements (FE) in time domain, can simulate the radiation damping of the foundation of arch dams and can study the effects of spatial variation of freefield in canyons on dynamic response of arch dams. The dynamic stresses of Laxiwa arch dam under harmonic loadings are analyzed by utilizing this model. The above mentioned effects are studied by comparative computation. Some conclusions are drawn.