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基于ANSYS对机场航站区高架桥与其下通过的地铁车站的交叉处结构进行了地震反应分析研究,建立了高架桥-地铁站-桩-土相互作用复杂结构体系的计算模型,同时与桥墩墩底简化为固定端模型单独来分析计算上部桥体以及取消地铁结构替换为承台和桩基础的整体模型进行了地震时程反应对比分析。结果表明:考虑相互作用后,整体结构的动力特性与刚性地基假定下的结果存在较明显的差异,不但体系的自振周期增大,并且前几阶主要振型也有很大改变;整体结构的最大位移增大,但顺桥向与横桥向增大幅度明显不同;而对于最大位移节点的加速度、桥梁支座及桥墩墩底反力,三者的顺桥向与横桥向的差别更加明显,其顺桥向比固定端模型减小,而横桥向出现增大的情况。这些现象表明:对复杂结构体系进行抗震设计分析时,考虑土-结构动力相互作用带来的影响十分必要。
Based on the ANSYS, the seismic response analysis of the intersection structure of the viaduct at the airport terminal area and the metro station under it is carried out. The computational model for the complex structural system of viaduct-metro station-pile-soil interaction is established. At the same time, For the fixed-end model, the analysis and calculation of the upper bridge alone and the replacement of the metro structure with the overall model of the pile cap and pile foundation were carried out. The results show that there are obvious differences between the dynamic characteristics of the whole structure and those under the assumption of rigid foundation after considering the interaction. Not only the period of natural vibration of the system increases, but also the major modes of the first few stages also change greatly. The maximum displacement increases, but the magnitude of increase along the bridge is obviously different from that of the transverse bridge. For the acceleration of the maximum displacement node, the bridge support and the pier bottom reaction force, Obviously, the parachute bridge is smaller than the fixed-end model, and the lateral bridge appears to increase. These phenomena show that it is necessary to consider the influence of soil-structure dynamic interaction when seismic design analysis of complex structural system.