大型渡槽考虑土-结构相互作用的动力分析

Dynamic analysis of large aqueducts with soil-structure interaction

根据某大型渡槽采用桩基础的结构特点，采用集中弹簧模型考虑上－结构相互作用；渡槽槽身采用薄壁梁段单元进行离散，考虑了渡槽槽身开口薄壁结构的横向弯扭耦合振动，约束扭转变形等结构自身特性；渡槽支架采用空间梁单元进行模拟。文章建立了大型渡槽的动力方程，对比计算了考虑上－结构相互作用与不考虑土－结构相互作用渡槽模态和地震响应的差异，计算结果表明： 考虑土－结构相互作用后，虽然对大型渡槽的模态和地震响应有所影响，但影响不显著，故对一般 渡槽的动力计算，可以不考虑土－结构相互作用的影响。

In this paper, based on structural characteristic of an aqueduct with pile foundation, a lumped spring model is employed to simulate soil-structure interaction. Shell-beam ele- ment model is employed to simulate the aqueduct body, which considers structural characteristics of traversal bending-twisting vibration, restraint twisting deformation of the aqueduct body with open-shell structure. The aqueduct braces are meshed into spatial beam element. This pa- per presents dynamic equations of the large aqueduct. The differences of mode and the seismic response between with and without consideration of soil-structure interaction are calcu- lated it is concluded that the interaction will make some effect on modes and seismic response of the aqueduct, however, the effect is not important. It is not necessary that the effect of the soil-structure interaction is considered for seismic analysis of large aqueducts.