主跨136m空间钢桁拱与预应力混凝土梁组合桥受力性能分析

Analysis on Stress Performance of Spatial Steel Truss Arch and Prestressed Concrete Beam Composite Bridge with 136-m Main Span

摘要:

为研究空间钢桁拱与预应力混凝土梁组合桥的力学性能，以广州市从化大桥为例，采用空间有限元分析软件对影响空间钢桁拱稳定性的主要控制因素以及拱与主梁抗弯刚度变化等对结构内力和位移的影响进行了参数分析。结果表明拱肋刚度对桥梁整体稳定性影响较大，横、斜撑刚度的影响不大；只有中间吊杆时，拱肋的稳定性较差；主梁刚度对桥梁受力影响较大；吊杆初始张拉力大小影响恒载作用下主梁和拱肋的受力状态。

Abstract:

In order to study the mechanical properties of the spatial steel truss arch and prestressed concrete beam composite bridge, taking Conghua Bridge in Guangzhou as an example, the spatial finite element analysis software is used to parametrically analyze the main control factors affecting the stability of spatial steel truss arch and the influence of the change of bending stiffness of the arch and main beam on the internal force and displacement of the structure. The results show that the stiffness of arch rib has a great influence on the overall stability of the bridge, and the stiffness of transverse and diagonal braces has little influence. When there is only middle boom, the stability of arch ribs is poor. The stiffness of the main beam has a great influence on the stress of the bridge. The initial tension of boom affects the stress state of the main beam and arch rib under constant load.