П形主梁无背索斜拉桥剪力滞效应分析

Analysis on Shear Lag Effect of the П Type Main Beam of Cable-stayed Bridge without Back Stay

以某座П形断面预应力混凝土主梁的无背索斜拉桥桥型方案为背景,采用三维实体有限元数值计算方法,分析探讨了自重恒载、活载、轴向力、预应力等荷载及其组合下的剪力滞效应问题。研究该种桥型剪力滞系数的分布规律,计算不同荷载及其组合下剪力滞系数。得到了该种桥型方案剪滞系数的一些重要结论,为该桥型方案的设计计算提供了重要的依据,也为同类桥型的剪力滞效应计算提供了参考资料。

With the background of a cable-stayed bridge plan, a П type section of prestressed concrete main beam and without back stay, adopting the 3D finite element method, the author analyzed gravity load, live load, axial force, etc. and the shear lag effect problem of these combinations. The distribution rule of the bridge type shear lag coefficient, the calculation of different load and these combinations were also studied in this paper. A lot of important results were gained, which provided foundations for the design calculation of the bridge type plan, meanwhile, provided reference for the similar type bridges.