地震作用下拱坝及坝面压力管道组合结构的动力模型试验

Dynamic model test for composite structure of arch dam and downstream penstocks under action of earthquake

通过动力模型试验．综合考虑库水、坝基等因素影响．对拱坝及下游坝面压力管道组合结构的动力相互作用规律和抗震性能．进行了全面研究．研究结果表明，下游坝面压力管道使拱坝的整体刚度略有增加，而对其动力特性无显著改变；地震作用下，压力管道段坝基基底应力和压力管道与坝面接触部位上部应力较大，压力管道穿越拱坝部位应力状态比较复杂，采用一定的设计措施后，组合结构具有相当抗震安全度．

The dynamic regularity of the interaction and the characteristics of the earthquake-resistant are studied for the composite structure of the arch dam and the downstream penstocks, by means of the dynamic model test and in consideration of the influnces of the reservoir water and the ground. The results show that the downstream penstocks slightly increase the overall stiffness of the arch dam and generally produce no obvious change for the dynamic behaviours of the arch dam,and that the considerable stresses are presented in both the ground of the arch dam of the penstocks and the upper location of the penstocks contacting with the arch dam,and there is the complicated status of the stresses in the arch dam cut through by the penstocks. If some measures are taken in the structural design, the composite structure will have the aseismatic reliablity correspond to the arch dam.