结合广西天鹅县红水河大桥,采用有限元软件MIDAS/CIVIL建模计算,对预应力混凝土连续刚构桥在施工阶段应力和变形展开研究。分析了在施工阶段中,梁体自重、预加应力、挂篮荷载、混凝土收缩徐变等因素作用对最大悬臂、边跨合龙和中跨合龙3个关键位置的受力影响,总结箱梁位移和应力的分布规律,研究了相应的施工控制策略,从而确保大桥的线形满足设计要求。 Combined with Hongshuihe Bridge in Swan County, Guangxi, the finite element software MIDAS / CIVIL was used to calculate and calculate the stress and deformation of prestressed concrete continuous rigid frame bridge during construction. In the construction stage, the influence of three factors such as self-weight of beam body, prestressing stress, hanging cradle load, shrinkage and creep of concrete on the three key positions of the maximum cantilever, the lateral cross-over and the mid- And stress distribution law, the corresponding construction control strategy has been studied to ensure that the bridge shape meets the design requirements.