摘要
针对非对称张拉施工斜拉桥存在的主梁和桥塔线形控制难题,以某大跨度钢混组合梁斜拉桥施工控制为例,开展了拉索索力统计敏感性分析研究.以斜拉索索力为设计参数,综合采用均匀试验和正交试验设计方法以及多元线性回归和极差分析显著性检验方法,对成桥和施工阶段主梁和桥塔截面的内力、位移进行统计敏感性分析.结果表明:提出的索力统计敏感性分析方法可准确获得成桥和施工阶段的敏感性索力参数;对于成桥阶段,S10、MS10、S9号斜拉索索力为结构线形的敏感性参数;非对称张拉施工时,S10、MS10、S9、MS9、S8、MS8、S5、MS5号斜拉索索力为影响主梁和塔顶截面位移的敏感性参数;若采用对称张拉施工,S10、MS10、S8、MS8、S9、MS9、S7、MS7号斜拉索索力则为影响主梁和塔顶截面位移的敏感性参数.
Abstract
In view of the difficulties in the linear control of main beams and towers of cable-stayed bridges under asymmet-ric tension construction,taking the construction control of a long-span steel-concrete composite beam cable-stayed bridge as an example,the statistical sensitivity analysis of cable force is carried out.Taking the cable force as the design parameter,the design methods of uniform test and orthogonal test,as well as the significance testing methods of multiple linear regres-sion and range analysis were comprehensively adopted.The displacement and internal force of the main beam and tower section in the bridge completion stage,as well as the displacement of the main beam and tower top section in the construc-tion stage are analyzed statistically.The results are as follows.The proposed method can accurately obtain the cable force sensitivity parameters of the bridge during its completion and construction.For the bridge completion stage,the cable-stay forces of S10,MS10,and S9 are the sensitivity parameters for the structural alignment.During asymmetric tension con-struction,the cable forces of S10,MS10,S9,MS9,S8,MS8,S5,and MS5 stay cables are sensitive parameters that af-fect the displacement of the main beam and tower top sections.If symmetrical tensile construction is adopted,the cable forces of S10,MS10,S8,MS8,S9,MS9,S7,MS7 stay cables are sensitive parameters that affect the displacement of the main beam and the top section of the tower.
维普
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