下承式叠合梁钢管混凝土拱桥拱脚局部应力分析

Local Stress Analysis of Arch-foot of Through Composite-beam CFST Arch-bridge

采用三维实体、板壳和梁单元,分析了某下承式叠合梁单索面钢管混凝土系杆拱桥拱脚局部应力,对整个拱脚模型应力做了综合评价。采用大型工程软件用两步有限元法分析拱脚局部应力。结果表明:拱脚整体受力比较均匀,对拱肋和拱座刚度突变处,应使刚度缓慢过度,可以有效降低应力峰值。

Local stress of arch-foot of through composite-beam single cable plane CFST tie-bar arch-bridge is analyzed by using 3D solid,plate-shell and beam element in this paper,and the stress of arch-foot model is estimated. Local stress of arch-foot is studied by using the two-step analysis method,the results show that the force of arch-foot structure distributes uniformly,and the slower the joint stiffness of arch and skewback,the lower the peak stress. The arch-foot structure is reasonable,and the structural idea can be used in the design of similar bridges.