Based on the foundation of heat conduction equation, this paper analyses the Yellow River bridge liujiaxia anchorage of mass concrete temperature field and stress field in the natural cooling and stratified pouring time interval for 7 days to circumstances with the MIDAS/CIVIL finite element software. The results show that the interval 7 days stratified pouring and natural cooling method, can't meet the requirements of concrete anti-crack.

Due to the environment, climate, loads and other factors, the pre-stress applied to the beam is not a constant. It is important for engineers to track the state of the pre-stress in order to ensure security of the bridge in service. To solve the problem mentioned above, the paper puts forward a new way to analyze the effective pre-stress using the displacement inversion method based on the inversion theory according to the measured vertical deflection of the bridge in service at different time. The method is a feasible way to predict the effective pre-stress of the bridge in service. Lastly, taking the pre-stressed concrete continuous rigid frame bridge for example, the effective pre-stress is analyzed by establishing the finite element model.