Large Span Continuous Prestressed Concrete Beam Bridge Construction Control And Temperature Effect Analysis

With its good mechanical behavior and easily maintenance,continuous beam bridge occupies the competitive position in morden long-span bridges. And it is necessary to do more research on the construction technology for the bridges. On the basis of the constructing of Dongyangdu Bridge across the XiangJiang river in Hengyang,Hunan,using the method based upon the grey predictive control system to forecast pre-camber of bridge segment, a more advanced control system-grey predictive control system for the construction of long-span PC continuous beam bridge has been developed. After the construction is accomplished, the results indicate that the grey predictive control system is adapted to the construction control for the long-span PC Continuous Beam Bridge. During the constructing of the bridge, the stresses caused by sunshine are important factors affecting its normal construct schedule. To solve the problem,the precondition is to make the temperature gradients and temperature variation of box grider clear. Therefore, this paper makes a thorough analysis of the effect of temperature difference and draws some reasonable conclusions after the tests of the temperature gradients, internal force and the deformation of continuous bridge for 24 hours a day. And a method is developed in this paper to make an active revise to the elevation of the main girder form on the premise of no influence to the bridge construct schedule.