Construction Monitoring and Control of Wudong Bridge

The main bridge of Wudong Bridge is a prestressed concrete rigid-frame and continuous girder hybrid bridge with variable cross section and having span arrangement(63+115+63) m and the bridge is located on a plan circular curve of R=1 000 m.The geometric shape and internal force of the bridge structure were calculated by the finite element software,the mechanical characteristics of the bridge were compared with those of the continuous girder and continuous rigid-frame bridges and the influential degree of curvature on the bridge was analyzed.In the construction stage of the bridge,the geometric shape and stress were measured and the measurements were compared with the calculations.The results indicate that the mechanical behavior of the bridge is basically similar to that of the continuous girder and continuous rigid-frame bridges,the curving effect of the bridge is not obvious and the construction control can be carried out approximately in accordance with the requirements for the straight continuous rigid-frame bridges.In the process of the cantilever construction of the bridge,the unit weight of concrete has considerable influence on the geometric shape and the influence of temperatures on the segment elevation is also significant and therefore,the parameters of materials should be modified timely.The measurements of the geometric shape and internal force of the main girder are agreeable with the calculation values and both the measurements and calculation values can meet the relevant requirements.