Calculation and Analysis of Concrete Crack Control Technology for Main Structure of Underground Station
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.
finite element analysisconcrete structureunderground stationcrack control
NETL
NSTL
万方数据
