大跨径连续刚构桥收缩徐变效应实测分析

摘要

混凝土收缩徐变对连续刚构桥的挠度及应力有非常显著的影响.以龙潭河大桥为实例,现场实测了大桥在成桥初期的挠度及应力变化.同时,运用有限元软件MIDAS/CIVIL按不同规范进行仿真计算,并与实测结果进行对比分析,得出了一些有益的结论.%The shrinkage and creep of concrete has significant effect to deflection and stress of continuous rigid frame bridges. Taking the Longtan River Bridge as example, plenty of data about defection and stress of the bridge at the early finished stages were measured on site. At the same time, simulation analysis was carried out based on different codes with the FEM software-MIDAS/CIVIL, and the calculation result and the field measued result were compared and analyzed. Then same useful conclusion was obtained.