空间索面独塔钢箱梁斜拉桥索力优化

Optimization of Rope Force in Single Tower Steel Box Girder Cable-stayed Bridge with Space Cable Face

空间索面斜拉桥由于结构特殊性,索力相互影响复杂,其合理成桥索力以及施工张拉力调整是需要解决的关键问题.为对以上问题进行研究,以石家庄市学府路斜拉桥为工程背景,将结构的弯曲和拉压应变能之和最小作为目标函数,通过控制主梁的挠度、弯矩和斜拉索索力等条件,采用影响矩阵法求解了成桥索力.结合钢箱梁斜拉桥先梁后索的施工特点,研究了不同斜拉索张拉方案的可行性.结果表明,求解得到的最优索力与设计索力误差很小,索力分布合理;通过正装迭代法求解得到不同方案的斜拉索张拉力及成桥索力,分析确定了最优的斜拉索张拉方案,为工程实际提供参考.

Space cable-stayed bridge has complicated interaction of cable forces because of its struc-tural particularity.Reasonable cabling force of bridge and adjustment of construction tensile force are the key problems to be solved.In order to study the above problems,the cable-stayed bridge on Xuefu Road in Shijiazhuang is used as the engineering background.By controlling the deflection,bending moment and cable-stayed cable force of the main girder,the influence matrix method is used to solve the cable-stayed cable force.Combining with the construction characteristics of steel box girder cable-stayed bridge,the feasibility of different cable-stayed tensile schemes is studied.The results show that the optimal cable forces obtained by the solution have little error with the design cable forces and a reasona-ble distribution of the cable forces.The cable tension and cable-forming forces of different schemes are obtained by the method of formal iteration,and the optimal cable tension scheme is determined by the analysis,which provides reference for engineering practice.