上承式多跨连续拱桥支架拆除顺序对结构的影响

Effects of Sequence of Removing Supports on Behavior of Structure in Deck Continuous Arch Bridge

针对软柔地基中建设的上承式多跨连续拱桥支架拆除问题,以绍兴县群贤路大坂湖桥为对象,采用考虑场地变形影响的有限元计算模型,分析了不同落架顺序对混凝土拱肋变形和应力的影响,提出合理的施工方案指导施工。仿真计算结果表明,上承式连续拱桥在落架过程中的结构内力与落架顺序有关,采用同时落架的拆架方法对结构安全比较有利,如采用中间向两侧对称落架或者一侧向另一侧依次落架,拱肋截面将会产生较大的拉应力,影响结构的施工安全性。

In order to investigate the effect of removing supports of deck continuous arch bridge which constructed in the soft ground,a finite element model was used.The model which considered the effect of ground deformation took Daban Lake bridge in Qunxian Road of Shaoxing as an object.The effects of different sequence of removing supports on deformation and stress of the concrete arch were analyzed,and a proper construction method was proposed.According to the simulation,for the deck continuous arch bridge,the structure force is related to the sequence of removing supports,using the method of removing supports simultaneously is more safe for structure,adopting the removing method from middle to bilateral symmetry or from one side to the other side sequentially,the section of arch rib will produce large tension stress,which will influence the safety of structure construction.