The Stress Analysis Of The 0＃ Block For The Songhua River-bridge Of Longhua

The PC continuous rigid bridge has been used as one of the most popular type because of its excellent structural performances. The stress distributions of the 0# block in the entire continuous rigid-frame structure is most complicated. In the course of constructing and running stages, cracks often start appearing in the 0# block. It brings serious safety problem and has been wildly taken into account by bridge engineers.Through comprehensively analyzing the theory and experimental current situation of 0# block' PC on the construction stage of PC continuous rigid bridge in our country, based on Songhua River-bridge of Longhua monitoring test datas, the PC analysis on the cantilever construction stage of 0# block was conducted and the results were as follows:1.The finite element analysis software ANSYS was applied to establish a FEM calculation model of spatial block, according to simulating stress distribution of 0# block, the stress distribution of which was complex of continuous rigid bridge, in construction process, the stress of control section of each construction stage was got. The stress state 0# block in the stage of maximum cantilever was analyzed and expect to guide the safety construction.2.On the spot, related stress tests were conducted to 0# block. according to the actual situation. By the comparative analysis of the results calculated by ANSYS model and test results on the bridge, the regulation of stress variation of 0# block during cantilever construction phase was explored so that the regions liable to be cracked were pointed and construction process was evaluated to ensure the safe use of the structure.Research showed that, according to the phase-space finite element analyses, this paper got the stress field of 0# block and closure block during cantilever construction phase. Through comparing the results between the theoretical calculation and the test in site, this paper got that the stress distribution of the top plate, bottom plate, web plate and diaphragm plate of the zero block was close to the theoretical calculation. The numerical simulation method in the construction phase was accurate and stress monitor was wonderfully successful. The research can offered the reference for the design and construction control of the same bridges.