中文摘要：

为确保猛洞河大桥施工过程的安全、设计目标的实现、施工工序的简化,研究其拱圈施工的斜拉扣挂方案。基于考虑施工过程的平面杆系有限元法,以拱肋线形偏差（拱肋制作线形与拱肋合龙设计线形的偏差）等于0为目标,并令交于索塔同一高度处的扣、锚索水平分力相等,采用正装迭代法确定劲性骨架安装阶段的扣锚索张拉力;以拱圈应力满足规范要求为条件,用试算法确定主拱圈外包混凝土浇注过程的扣索索力初张值和调整值。在上述方案基础上,对骨架安装和外包混凝土浇注两个关键施工阶段分别进行关于拱肋线形和应力的参数敏感性分析,找出了灵敏度较大的结构参数,以便进行有针对性的控制。利用外包混凝土合龙状态的参数敏感性分析结果,对外包混凝土浇注过程中的扣索布置方案和完成后的拆除顺序进行了优化。

英文摘要：

In order to ensure the safety of construction process,the achievement of design goal and the simplification of construction procedure,the stay-cable buckling scheme for the arch ring of Mengdong river bridge was studied.Based on the planar frame finite element method considering construction stages,programmed zero deviation of the arch configuration（the deviation between the fabrication configuration and the designed closure configuration） as goal,let the horizontal forces of the buckle cables and the corresponding anchor cables intersecting at the same height of the pylon be equal,the tensioning forces of the buckle and anchor cables during the erection of steel tube frame were determined by forward iteration method.The tensioning forces and adjusting forces of the buckle cables during the pouring of wrapped concrete were gotten by trial method under the requirements of arch ring stress in related standard.On the basis of the above scheme,the parametric sensitivity analysis of the arch rib configuration and arch stress for the erection stage of steel tube frame and the pouring stage of wrapped concrete were done respectively,and the structural parameters with higher sensitivity were found out so as to control with pertinence.By using the parametric sensitivity analysis result of the closure state of wrapped concrete,the layout scheme of buckle cables during the pouring of wrapped concrete and the demolition order after the closure was optimized.