Prestressed Concrete Continuous Beam Bridge Block 0 # Together And Stress Analysis

PC continuous box girder bridge has been wildly used in long-span bridge for its excellent performance in structure. In the course of constructing and running, the zero block and closure block often have crack. It brings serious safety problem and has been wildly regard by the bridge engineer.This study supported by Xie gan Bridge in Suzhou city. According to the whole construction period, it studied the most complicated zero block and closure block. And we also test the temperature and stress in site; analyze the interspace finite element with the help of Ansys system. Then we establish the stress field during the construction period for the zero block and closure block by imitate analyzer.Based on the result of calculation and test, it summarizes the change law of stress during the construction and put forward the area which crack is most likely happen.It shows that before the pre-stress is loaded, the main stress of cross frame which caused by temperature change is exceeds the limit of specifications. At this time the cross frame in zero block is likely to crack. When the cantilever came to the end point, the tension tress of the top frame of zero block is very big and is likely to crack. When the bridge is fold, there is no tension stress in zero block. While there has tension stress in top and bottom frame of the closure block, especially in top.According to the interspace finite element analyses, this paper gets the stress field of zero block and closure block during the construction period. The test in site confirms that the theory analyses is available. The research can offer the reference for the design and construction control of the same bridges.