不同施工方法对系杆拱桥受力状态的影响分析

Influence of Different Construction Methods on Stress of a Tied Arch Bridge

某系杆拱桥由于施工现场条件限制,施工方案从先拱后梁改变为先梁后拱。利用有限元分析软件,开展施工步骤模拟,对2个施工方案下系杆拱桥的结构受力状态开展分析,并提取成桥阶段结构受力进行比较,结果表明:采用先梁后拱施工,吊杆受力可基本保持一致,拱肋受力变大,纵梁受力变小。对于该工程,2个施工方案均能够满足成桥阶段的结构受力要求,对于同类工程,需要重点对拱肋受力开展分析。

Due to the limitation of construction site, the construction scheme of a tied arch bridge is changed from arch-to-beam to beam-to-arch. The finite element analysis software is used to simulate the construction steps and analyze the stress state of the bridge structure under 2 construction schemes. The structural stress at the completion stage is compared. The result shows that the stress of the suspender can be basically consistent, the stress of the arch rib becomes larger and one of the longitudinal beam becomes smaller by the method of beam-to-arch. Both construction schemes can ensure the structural stress requirements at the completion stage. It is necessary for similar projects to focus on the stress analysis of arch ribs.