跨线桥对相邻倒虹吸结构影响的三维计算分析

Three-Dimensional Calculation and Analysis of the Overpass Bridge Impact on Adjacent Inverted Siphon Structure

倒虹吸结构作为我国南水北调工程中重要的输水结构物之一,不可避免地会穿越桥梁等地上结构物,桥梁荷载会通过基础桥桩对相邻倒虹吸结构产生影响。为了研究分析这种影响规律,利用ADINA有限元软件建立倒虹吸结构-土体-跨线桥三维空间模型。通过计算分析可知,桥梁活载的影响可以忽略不计,在未考虑地震作用时,桥梁对相邻倒虹吸结构位移变形影响较小,拉应力影响值得关注,考虑地震作用后变形及应力影响均值得工程人员关注,尤其是扭转变形。

Inverted siphon structure in the South-to-North Water Transfer Project is one of the important water conveyance structures. It inevitably goes across the ground structures,such as bridges. In order to study the impact on inverted siphon by the adjacent structure of overpass bridge,the inverted siphon structure-soil-overpass bridge was established based on ADINA finite element analysis software. Through the calculation and analy-sis,we find out that the influence of live load on the bridge can be neglected,without considering earthquake effect,the overpass bridge has less influence on the inverted siphon structure of displacement and deformation,but the tensile stress effect is remarkable,considering the earthquake effect,the influence of deformation and stress is both worth watching,especially the torsion deformation.