大跨径波形钢腹板连续梁桥非对称悬臂施工应力及屈曲分析

Analysis of stress and buckling of long span Continuous girder bridge with corrugated steel webs at asymmetric cantilever construction stage

大跨径波形钢腹板连续梁桥为了减少悬臂施工阶段及运营阶段墩顶箱梁承受的剪力及负弯矩,在设计时通常将跨中一定范围内的箱梁混凝土底板替换为钢底板来减小中跨结构重量,而边跨相对应节段采用满堂支架施工,这种非对称悬臂施工会使桥梁边跨及中跨混凝土应力分布出现较大差异。通过对某三跨波形钢腹板连续梁桥在非对称悬臂施工过程中混凝土应力分布特性及屈曲分析特征值进行分析并得出一些结论,为后续研究提供参考。

In order to reduce the pier table box beams shear and negative moment of long-span corrugated steel web continuous bridge,it is common to replace the across mid-span floor of concrete in Steel bottom plate to reducing midspan weight and full scaffold construction is used in side span corresponding stage. The unsymmetrical cantilever construction makes the stress distribution of the bridge span and middle span larger. In this paper,through the study of the stress distribution characteristics and the buckling analysis characteristic value of a three span corrugated steel web continuous beam bridge in the asymmetric cantilever construction process,some conclusions are obtained,which can provide reference for the follow-up study.