大跨度斜拉拱组合桥极限承载能力分析

以一种新颖钢管混凝土拱桥斜拉钢管混凝土拱组合桥为研究对象,考虑钢管混凝土拱在变形、失稳破坏期间的几何及材料非线性特性,采用统一理论中的钢管混凝土组合构件本构关系及高精度不分层梁单元,对在建的某斜拉钢管混凝土拱组合桥进行了在静力荷载作用下的极限承载力分析,并用钢管混凝土拱模型实验对分析程序及钢管混凝土组合构件建模方法进行了验证,同时分析了斜拉索及斜拉索的初索力对拱桥承载能力的影响.结果表明,斜拉钢管混凝土拱组合桥具有较高的稳定性和极限承载力,斜拉索能够较大提高拱桥的承载能力,斜拉索初张力对稳定承载能力的影响不大.

Ultimate Bearing Capacity Analysis of Long-span Cable-stayed Arch Bridge

This paper studied cable-stayed concrete filled steel tube arch bridge.Considering the nonlinear characteristics of concrete filled steel tube arch in both material and geometry in deformation and instability,the ultimate bearing capacity of a cable-stayed arch bridge under construction was analyzed under static loads,based on the constitutive relations of combinatorial material of concrete filled steel tube and the finite element method of high accuracy beam.In addition,the results of a model test for concrete filled steel tubular arch have confirmed the analysis program and the modeling method of concrete filled steel tube combination component.The analysis results indicate that cable-stayed arch bridge has very high stability and ultimate bearing capacity,the cable can comparatively greatly enhance the bearing capacity of arch bridges,and the influence of the initial tension of cables on the bearing capacity is small.