南太子湖拱形连续箱梁桥参数敏感性分析

为了准确把握拱形连续箱梁桥在施工阶段及运营阶段内力和线形的变化，以武汉南太子湖大桥为例，采用有限元方法建立了全桥仿真计算模型，分析了刚度、自重、混凝土收缩徐变、温度、预应力等参数对桥梁内力和线形的影响规律。结果表明，预应力损失对桥梁内力和线性影响最大，自重、刚度误差对线形影响相对较小，挠度变化幅度为理论值的5％-27％。预应力损失使上缘应力减幅达6．7％，下缘应力减幅达14．4％。混凝土收缩徐变对参数的误差效应有放大作用。

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.