摘要
采取有限元分析和理论计算相结合的方法,对车站侧墙和底板内部的混凝土温度和应力进行分析,研究了车站主体结构侧墙和底板的温度、应力分布情况对混凝土裂缝控制的影响。结果表明:车站C45混凝土不采取控裂措施时,混凝土抗裂安全系数为0.96,不满足规范大于1.15的要求,开裂风险很大;在采取侧墙降温和底板升温的技术措施后,混凝土抗裂安全系数可达到1.16;与不布设冷却水管的底板和侧墙相比,布设冷却水管的底板温升和侧墙温降分别约为3~8℃和4~6℃,且布设冷却水管后拉应力在后期减少幅度可达到0.9 MPa,能有效减少混凝土开裂风险。
By using the method of combining the finite element analysis and theoretical calculations,the temperature and stress of the concrete inside the side wall and baseplate of the station are analyzed,and the influence of the temperature and stress distribution of the side wall and baseplate of the main structure of the station on the control of concrete cracks is studied.The results show that when the crack controlling measures are not taken for C45 concrete of the station,the concrete crack resistance safety factor is 0.96,which cannot meet the requirements of the specification greater than 1.15,and the risk of cracking is very high.When the technical measures are taken for the cooling of side wall and the heating of baseplate,the concrete crack resistance safety factor can be reached 1.16.Compared with the baseplate and side wall without cooling water pipes,the temperature rise of the baseplate and the temperature drop of the side wall with the cooling water pipe are about 3~8℃and 4~6℃respectively,and after the cooling water pipe is installed,the tensile stress can be reduced by 0.9 MPa in the later stage,which can effectively reduce the risk of concrete cracking.
作者
刘伟
谷坤鹏
LIU Wei;GU Kunpeng
出处
《城市道桥与防洪》
2024年第7期223-227,M0020,共6页
Urban Roads Bridges & Flood Control
关键词
有限元分析
混凝土结构
地下车站
裂缝控制
finite element analysis
concrete structure
underground station
crack control
