结合天津市于家堡交通枢纽站房结构实际工程,基于有限元软件ANSYS详细模拟了实际施工过程,以精确模拟拆撑过程中各构件的内力分布。然后,采用降温法模拟切割连接构件进行拆撑的方式,对引起的动力响应进行了详细分析计算。分别选取反力最大的提升点与支撑点,研究主体结构与临时支撑体系在拆撑时的动力响应。结果显示:该拆撑方式引起的结构动力响应与支撑点反力、拆撑位移及结构刚度等因素有关;拆撑后的振动过程中,主体结构与临时支撑体系存在复杂的相互作用,而有限元方法可精确捕捉该过程;拆撑后的振动效应对提升拉索的影响最为不利,设计中应保证提升拉索及节点的可靠度;拆撑引起的振动效应对临时支撑结构的影响要大于主体结构,支撑体系设计阶段应充分考虑整个施工方案,提高临时支撑的可靠度,而不是仅满足静力强度。 Combined with the actual project of Yujiapu traffic hub station building in Tianjin, the actual construction process is simulated in detail based on the finite element software ANSYS to precisely simulate the internal force distribution of each component in the process of dismantling and holding. Then, cooling method was adopted to simulate the way of cutting and connecting components to dismantle and support, and the dynamic response was analyzed and calculated in detail. The lifting points and supporting points with the largest reaction force are respectively selected to study the dynamic response of the main structure and the temporary supporting system during demolition and strutting. The results show that the structural dynamic response caused by this bracing mode is related to the reaction force of supporting points, displacement of displacements and structural rigidity, and so on. During the vibration process after demolishing and supporting, there are complex interactions between the main structure and the temporary supporting system. However, The meta-method can accurately capture the process. The vibration effect after dismantling is the most unfavorable to the lifting cable, and the reliability of the cable and node should be increased in the design. The vibration effect caused by the dismantling support has a greater effect on the temporary supporting structure The main structure, support system design stage should give full consideration to the entire construction program, to improve the reliability of temporary support, rather than just to meet the static strength.