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针对跨线桥在地震作用下对相交的倒虹吸结构的影响,以南水北调中线工程中某相交的倒虹吸与高速公路钢管拱桥为例,根据地质、倒虹吸结构、公路桥桥桩等资料,利用ADINA有限元分析软件建立了平面有限元模型。利用时程分析法分析了水平地震作用下桥桩与土体及倒虹吸结构体系的相互作用,以及静荷载与地震荷载作用下桥桩对倒虹吸结构工作性态的影响,并对结构安全作出评价。结果表明,跨线桥对倒虹吸结构的位移值影响不超过15%,与不考虑跨线桥作用的工况相比最大加速度放大系数减少到15%,且加速度误差在工程误差范围之内;最大拉应力为混凝土最大抗拉强度的2倍多,可能出现拉裂破坏。
In view of the influence of overpass on the intersecting inverted siphon structure under the action of earthquake, taking an inverted siphon and expressway steel tube arch bridge in the midline of South-to-North Water Diversion Project as an example, according to the geological, inverted siphon structure and highway bridge piles, ADINA finite element analysis software to establish a planar finite element model. The interaction between bridge piles and soil and inverted siphon structure under horizontal earthquake is analyzed by means of time-history analysis, and the influence of bridge piles on the behavior of inverted siphon under static and earthquake loads is also analyzed. Evaluation. The results show that the influence of overpass on the displacement of inverted siphon structure is less than 15%, and the maximum acceleration amplification factor is reduced to 15% compared with the case without considering the effect of overpass. The acceleration error is within the range of engineering error. The maximum tensile stress is more than twice as much as the maximum tensile strength of concrete, which may lead to fracture.