摘要
深中通道沉管管节采用钢壳-混凝土组合结构形式,通过向空钢壳浇筑混凝土预制而成。为评估沉管管节施工后的整体变形,建立了热-结构顺序耦合的分析框架,基于ANSYS APDL及UFPs二次开发模块,分别建立了考虑水化度、日照辐射、大气温度变化的精细温度场模型和考虑混凝土硬化及收缩特性的结构分析模型。通过对足尺管节的温度及应变模拟结果与监测数据的对比,验证了有限元模型的可靠性。在此基础上,分析了日照辐射、大气温度变化等对于管节温度场的影响,同时分析了管节的整体变形模式,以及温度效应、混凝土收缩及自重三种因素对管节整体横向、纵向及竖向变形的影响。结果表明:管节施工过程的温度场表现为时变和空间分布的特征,格仓边部温度受外界气温变化和日照辐射的影响存在周期性波动,而格仓中部温度峰值主要受混凝土自身水化放热特性的控制;管节最终表现为顶板横向及纵向内收,竖向下挠,底板横向及竖向变形不显著;太阳辐射对于结构温度场影响较日气温变化更显著,建议在混凝土温度峰值预测中予以考虑,而日气温变化可采用日平均气温值予以简化;温度效应及材料收缩对管节横向及纵向整体变形影响显著,自重因素导致的变形在横向及纵向的比例为44.3%、11.7%,而在竖向所占比例达92.5%,因而温度效应及材料收缩在管节横向及纵向变形分析中不可忽视;该分析方法可适用于大体积混凝土等结构的温度效应的预测和评估。
The steel shell-concrete composite structure,which is prefabricated by pouring concrete into the empty steel shell,is adopted in the immersed tunnel of Shenzhen-Zhongshan Link.To evaluate the overall deformation of the immersed tube after construction,a thermal-structural sequence coupling analysis framework was proposed.Based on the ANSYS APDL and UFPs modules,the refined temperature field model that considers the degree of hydration,solar radiation,and ambient temperature variation,and the structural model that considers concrete hardening and shrinkage were established.The reliability of finite element models was verified by comparing the analytical temperature and strain results of the full-scale tube with the monitoring data.On this basis,the overall deformation mode of the immersed tube and the influence of temperature effect,concrete shrinkage and dead weight on the overall horizontal,vertical and vertical deformation of the immersed tube were studied.The results show that the temperature field of the tube during the construction is time-varying and spatially distributed.The temperature of the side of compartments shows periodic fluctuations due to ambient temperature variation and solar radiation,but the peak temperature of the middle part of compartment is controlled by the concrete hydration itself;the roof of the tube shows contraction in the lateral and longitudinal directions,and deflection in the vertical direction.The floor of the tube shows no significant deformation in the lateral and vertical directions;the influence of solar radiation on the structural temperature field is more significant than the daily temperature variation,so the solar radiation is recommended to be considered in predicting the temperature peak,and the daily temperature variation can be simplified by using daily average temperature;the temperature effect and material shrinkage have a significant impact on the overall deformation of the tube in the lateral and longitudinal directions.The proportions of the deformation in the lateral and longitudinal directions caused by the dead weight are 44.3%and 11.7%,but the proportion in the vertical direction is 92.5%.Therefore,the temperature effect and material shrinkage cannot be ignored in the analysis of the lateral and longitudinal deformation;the analysis method in this paper can be applied to the prediction and evaluation of the temperature effect of mass concrete structures.
作者
樊健生
魏晓晨
宋神友
金文良
苏宗贤
刘宇飞
FAN Jian-sheng;WEI Xiao-chen;SONG Shen-you;JIN Wen-liang;SU Zong-xian;LIU Yu-fei(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Tsinghua University,Beijing 100084,China;Administration of Shenzhen-Zhongshan Channel,Guangzhou 510600,China;Poly Changda Engineering CO.,LTD,Guangzhou 510062,China)
出处
《工程力学》
EI
CSCD
北大核心
2024年第5期167-178,共12页
Engineering Mechanics
基金
广东省重点领域研发计划项目(2019B111105002)
国家自然科学基金项目(52121005)。
关键词
隧道工程
温度效应
热-结构耦合分析
钢壳混凝土组合沉管
ANSYS
温度场模型
tunnel engineering
temperature effect
thermal-structural coupling analysis
steel shell-concrete composite immersed tunnel
ANSYS
temperature field model
