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为研究大跨度钢管混凝土拱桥在结构受到损伤情况下的极限承载力,以某特大桥为例,假定该桥在营运阶段主拱圈拱脚根部截面受到损伤,借助通用有限元程序ANSYS建立相应的空间有限元模型,研究过程中引入考虑套箍效应的钢管内混凝土本构关系,对该类桥型的拱脚关键部位损伤前后,在3种不同工况下极限承载力进行了对比分析,得出了相应的极限荷载系数、破坏模式以及荷载-位移曲线之间的关系。结果表明:在该类结构极限承载力分析过程中,非线性效应十分明显;关键部位的轻微损伤对该类结构的极限承载力有较为明显的影响,但不影响结构破坏的模式;在结构的极限承载力分析中,必须考虑几何与材料的双重非线性特性的影响。
In order to study the ultimate bearing capacity of long-span CFST arch bridge under the condition of structural damage, taking a special bridge as an example, it is assumed that the root section of the arch arch of the main arch ring is damaged in operation stage. Based on the general finite element program ANSYS, Space finite element model. The constitutive relation of concrete in steel tube considering the hoop effect was introduced into the research. The ultimate bearing capacity of three kinds of different working conditions before and after the damage of key parts of the arch bridge was compared and analyzed. The corresponding limit load factor, failure mode and the relationship between load-displacement curve are obtained. The results show that the nonlinear effect is obvious in the analysis of the ultimate bearing capacity of such structures; the slight damage of the key parts has obvious influence on the ultimate bearing capacity of such structures, but does not affect the mode of structural failure; In the analysis of ultimate bearing capacity, the influence of the double nonlinearity of geometry and material must be considered.