客运专线中"V"型钢管混凝土拱桥极限承载力研究

针对铁路钢管混凝土拱桥桥面较窄、承受活载较大、稳定问题突出的特点,采用弹性屈曲,几何非线性屈曲,几何和材料双重非线性屈曲3种方法对钢管混凝土拱桥极限承载力进行分析,并以某客运专线上的一“V”型墩刚构,主跨为220 m中承式钢管混凝土拱桥为例,运用有限元程序对该桥的极限承载力进行参数分析与比较,给出影响拱桥极限承载力的主要参数。研究结果表明:结构极限承载力与结构材料非线性、材料屈服应力、荷载分布方式以及温度的变化有关联。这些参数的选择与使用,与结构极限承载力的准确度密切相关。

The ultimate capacity study of "V" model pier steel tube concrete arched bridge on the line for passenger transport railway

For the deck of steel tube concrete arched bridge is narrow on the railway line,and it bears prodigious moving load,it's stability is very prominent.Three methods were adopted to analyse the ultimate capacity of steel tube concrete arched bridge,the methods include elastic buckling,geometrical non-linearity,geometrical and material non-linearity.The example bridge is an arched bridge of a 220 m central span length under construction on the line for passenger transport railway and it's piers are 'V' form.The effects of different parameters on the ultimate capacity of the bridge were studied by the large-scale currency finite element software.The results show that the effects of different parameters on the ultimate capacity of the bridge mostly include structural material non-linearity,material yield stress,different moving load distributing and variable temperature.The adoption of the parameters is relational with ultimate capacity of the structure.