The Simulation Calculation And Construction Deviation Impact Analysis Of Railway Prestressed Concrete Continuous Rigid Frame Bridge

In recent years, the use of the large span prestressed concrete continuous rigid frame bridge has been promoted widely in the field of traffic engineering in China because of its significant advantages. But with lots of prestressed concrete continuous rigid frame bridges built, they have exposed many problems to be solved in the process of construction and operation, such as the deviation of the axis of segmental girders. Therefore, the structure needs simulation analysis in bridge design and construction stage, so as to ensure that the internal forces and linear under finished stage can meet the code requirement. Meanwhile, the key subassemblies under force should be given intensive monitoring.The thesis is at the background of a double-track exceptionally large bridge on the railway. As a prestressed concrete continuous rigid frame bridge, the main spans arrange as (88+160+88) m. During the cantilever casting construction, the maximum deviation of the axis of cantilever casting segments reached92mm. On the basis of theoretical research and finite element simulation of whole bridge, the author studied on the internal forces, stresses and deflections of the structure in the process of construction, through the simulation analysis of construction process of the prestressed concrete continuous rigid frame bridge, providing a set of analytical data for the bridge construction. After building the design model under ideal finished stage, the author conducted the calculation analysis in operation stage. The result shows that the bridge model can meet the code requirement.Simultaneously, a deviation model was built based on the design model in consideration of the case of construction deviation. Then the author calculated the structure force condition in construction and operation stage, considering the deviation of segmental girders. On this basis, the author then compared the results of the deviation model with the results of the design model. Thus the auther finally came to the conclusion.This paper made a comparative analysis of the influence of the deviation of the axis of segmental girders due to construction errors on the bridge service performance, which can provide good reference for the design and construction of similar bridges.