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现有的渡槽数值研究中,都将结构底部作刚接的简化处理,人为地增大了结构的刚度,与实际情况不相符合。本文基于势流体假设建立渡槽-水流固耦合二维联体式渡槽模型,分别计算比较刚性地基约束情况和考虑桩土作用的弹性地基约束情况下的渡槽结构在不同水深工况下的计算结果,分析各工况下土-结构相互作用的影响变化。结果表明,槽内水体作用和槽底桩土作用均使结构自振频率降低,并且前者对后者的影响不容忽视。
In the existing numerical study of aqueducts, the simplification of the connection of the bottom of the structure is just adopted, which increases the stiffness of the structure artificially and does not accord with the actual situation. Based on the assumption of potential fluid, a two-dimensional aqueduct-fluid-structure coupled aqueduct model is established, and the calculation results of the aqueduct structure under different water depth conditions are compared respectively with the comparison of rigid foundation constraints and the elastic foundation constraint considering pile-soil interaction. Variation of soil-structure interaction under various conditions. The results show that both the effect of water in the tank and the effect of pile-soil at the bottom of the tank decrease the natural frequency of the structure, and the influence of the former on the latter can not be ignored.