某地下综合换乘服务中心超长混凝土结构施工阶段温度收缩仿真研究

Research on simulation of temperature shrinkage in the construction stage of a super long underground comprehensive service center structure

以某地下综合换乘服务中心在建项目为背景,运用有限元软件MIDAS/Gen对该地下综合换乘服务中心进行了模拟计算。首先对仿真分析中收缩、徐变等计算模型进行了简要介绍,通过模拟仿真计算结果与实测结果的对比验证了计算模型,然后再在根据施工过程现场实测结果分析所确定的最不利温度荷载工况的基础上,建立了简化有限元分析模型,预测分析了施工阶段结构的降温温差、升温温差、后浇带封闭顺序等因素对超长地下室结构受力的影响规律,为该工程后续施工提供了指导,也为类似工程提供了一定的数据参考。

An underground comprehensive transfer service center in construction was set as background in this paper.The finite element software MIDAS/Gen was used to simulate structure of the underground comprehensive transfer service center.Firstly, the calculation models of shrinkage and creep in the simulation analysis were introduced briefly, and the calculation model was verified by comparing the simulation calculation results with the actual measurement results.Then, a simplified finite element analysis model was established to predict and analyze the temperature difference between the temperature drop and the temperature rise in the construction stage based on the analysis and determination of the most unfavorable temperature load conditions.The influence factor of the factors, such as decrease and increase of temperature and closure sequence of the post cast strip, was also studied, which can be taken as reference by similar projects.