【摘要】 以主跨460 m的中承式钢管混凝土拱桥——巫峡大桥为研究对象,应用双重非线性有限元法对钢管混凝土拱桥的极限承载力进行了参数研究.研究参数包括初始缺陷、荷载形式及其作用方式、体系温度、矢跨比、管内混凝土强度、含钢率等.分析结果表明:初始缺陷、集中荷载作用方式以及体系温度对结构极限承载力影响不明显;均布荷载的作用方式、矢跨比、管内混凝土强度以及含钢率是影响结构极限承载力的几个关键因素.更多还原

【Abstract】 A bridge was taken as an example which is the longest span half-through concrete-filled steel tubular(CFST) arch bridge with a main span of 460 m in China.The influences of different parameters on the ultimate load-carrying capacity of CFST′s arch were studied by using the dual non-linearity finite element method.The results show that initial imperfection,disposal manner of concentrated load and system temperature influence the ultimate load-carrying capacity lightly.The load-carrying capacity of the CFST arch is mainly determined by the following factors: the distribution of uniform loads,the ratio of rise to span,the concrete strength filled in the steel tubular and ratio of steel in the cross-section.These conclusions give reference to designing this type of arch bridges.更多还原