钢箱梁顶推局部受力及稳定性分析

Analysis of Local Force and Stability of Steel Box Girder during Incremental Launching Construction

为了探讨在顶推施工过程中钢箱梁的局部受力,以某钢混组合梁桥顶推施工方案研究为依托,利用有限元Midas FEA建立钢箱梁局部分析模型,进行局部应力分析和局部稳定分析。通过分析结果研究了腹板角度、底板加劲肋布置、腹板厚度等结构参数对局部受力的影响,并提出改善局部受力的构造措施。

To discuss the local force of the steel box girder during the incremental launching construction,based on the incremental launching construction scheme of a reinforced concrete composite bridge,this paper establishes the local analysis model of the steel box girder using the finite element Midas FEA to analyze the local force and local stability.Through the analysis,the influences of the angle of the web,the stiffening rib arrangement of the bottom board,the web thickness,and other structural parameters on local force are studied,and the structural measures to improve local forces are put forward.