Sensitivity Analysis of the Southen Taizi Hu Arch Continuous Box Girder Bridges

In order to accurately grasp the variation of internal forces and deflection for Arch Continuous Box Girder Bridges in the construction phase and the operational phase,the southern Taizi Hu Bridge in Wuhan was taken as the studying case.The paper analyzed the effects of stiffness,self-weight,creep and shrinkage of concrete,temperature,prestressed on the internal forces and deflection.The results showed that the loss of prestressed hd a greatest impact on the internal forces and linear.But devation and shrinkage and stiffness had a smaller affection on deflection and force.The changes of deflection was in 5%—27% of the theoretical value.Because of prestressed losses,the stress of the up edge reduced 6.7%,the stress of the down edge reduced 14.4%.Creep and shrinkage of concrete enlarge the error affection.