多层立交隧道复杂节点结构地震响应特性分析

Analysis of seismic response of complex multi-layer tunnel node structure

以南京某工程的多层交叉节点结构大型振动台试验为基础,基于ABAQUS有限元软件,采用一致粘弹性边界模拟土体的边界条件,建立考虑土-节点结构动力相互作用的三维有限元模型,分析各试验工况下的结构及土体的地震响应,与试验结果进行对比,验证模型的正确性,在此基础上,分析原型结构的地震响应特性。结果表明:数值模拟结果与振动台模型试验的结果基本一致;多层立交隧道节点结构的破坏程度与其埋深密切相关,埋深越大破坏程度相对减小,多层立交隧道节点结构的薄弱环节主要集中在板与侧墙、中墙的交界处,且结构的地震动特性在很大程度上受周围土体的性质的影响。

Based on a large shaking table test of a multi-layer tunnel node structure of one engineering project in Nanjing, this research establishes a three-dimensional finite element with the consideration of the soil-node dynamic interaction by using ABAQUS software and adapting the consistent viscous-spring artificial boundaries to analyze the seismic response under different working conditions, then compares with the experimental results in order to prove the validity of the model and analyze the seismic response of prototype. The results indicate that the numerical solutions are in well accordance with the results of the shaking table model test; node structure＇ s degree of damage node structure is closely related to the depth that it is buried, the deeper it is buried, the less damage it absorbs; weak links of the structure mainly locate at the junctions of plates and side walls; the structure seismic response is greatly affected by the characteristics of the surrounding soils.