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采用双重非线性的分析方法,运用大型有限元分析软件Ansys,对一座单肋对角斜跨桥的受力性能进行了分析。实现了桥梁受力全过程分析,并探讨了初始缺陷以及截面厚度变化对单肋对角斜跨拱桥受力性能的影响。结果表明:在满跨均布活载作用下,拱肋的破坏始于L/6和5L/6截面的屈服,拱肋逐渐由无铰拱转变为三铰拱进而失去承载能力;拱轴线的面内初始偏移对单肋斜跨拱桥的极限承载力影响不明显;拱脚截面加厚是提高单肋斜跨拱桥极限承载力的有效措施。
Using double nonlinear analysis method and large-scale finite element analysis software Ansys, the stress performance of a single rib diagonal ramp-span bridge is analyzed. The whole process of bridge stress was analyzed, and the influence of initial defects and section thickness on the stress performance of single diagonal diagonal span arch bridge was discussed. The results show that the failure of arch rib begins with the yield of L / 6 and 5L / 6 cross-sections under full cross-section live load, and the arch rib gradually changes from a non-hinge arch to a triple-hinge arch and loses its bearing capacity. The initial in-plane offset has no obvious effect on the ultimate bearing capacity of single-rib-slapped arch bridge. The thickened arch foot is an effective measure to increase the ultimate bearing capacity of single-rib-slapped arch bridge.