【摘要】 重庆鹅公岩轨道专用桥采用了自锚式钢箱梁悬索桥形式,由于其特殊的构造,稳定问题比较突出,尤其是在施工阶段。本文基于精细有限元方法建立全桥模型,采用弧长法进行了悬索桥各个施工阶段的非线性静力稳定承载力分析,重点研究了自锚式悬索桥在最大单悬臂状态下的整体稳定问题。结果表明:最大单悬臂状态整体稳定问题的稳定系数值在重现周期为10年的纵向风荷载作用下最小为1.523,在重现周期为20年的纵向风荷载作用下最小为1.410,满足施工安全性的要求。更多还原

【Abstract】 The form of self-anchored steel box girder suspension bridge is used for Chongqing Er Gong Yan special railway bridge. Due to its special structural function, its stability problem is quite prominent, especially in the construction stage. In this paper, based on the finite element method to establish the whole bridge model, the arc length method is used to analyze the nonlinear static stability bearing capacity of each construction stage for the suspension bridge, and the overall stability of the self-anchored suspension bridge in the maximum single cantilever state is studied in details. The results show that the minimum stability coefficient for the maximum single cantilever construction is 1.523 under the longitudinal wind load with recurrence interval of 10 years and 1.410 under the longitudinal wind load with recurrence interval of 20 years, which meets the requirements of construction safety; it is also shows that the proposed finite element model and analysis procedure in this paper are feasible for the analysis of the overall stability of the structure in the construction stage, and the simulation conclusion has important guiding significance for the construction procedures.更多还原