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以已建成的千米级斜拉桥苏通大桥为例,采用通用有限元软件建立其空间动力模型,进行动力特性分析并研究了考虑地震波行波效应作用下的地震反应。研究结果表明:行波效应对结构内力响应和位移响应并非一致相同,并且地震波视波速不断增大最终逼近于一致激励结果,相关的计算结论可为大跨斜拉桥的抗震设计提供参考。
Taking Sutong Bridge as an example, a cable-stayed suspension bridge with 1000-meter-span has been built as an example. The general dynamic finite element software is used to establish the space dynamic model and analyze the dynamic characteristics of the cable-stayed bridge. The seismic response considering the seismic wave traveling wave effect is also studied. The results show that the traveling wave effect is not identical to the internal force response and the displacement response of the structure, and the wave velocity of the seismic wave is eventually increasing and finally approaching the consistent excitation result. The relevant conclusions can provide reference for the seismic design of long-span cable-stayed bridges.