铁路钢桁梁斜拉桥斜拉索张拉力的计算方法研究

Study on Calculation Method of Stay Cable Tension of Railway Steel Truss Beam Cable-stayed Bridge

针对铁路钢桁梁斜拉桥恒载中二期恒载所占比例较大的现状,考虑施工过程中各斜拉索张拉两次,即悬臂施工阶段安装每根斜拉索时进行初次张拉,铺装二恒后各索再进行第二次张拉(即终张调索),并提出了斜拉索两次张拉力的计算方法。研究结果表明:施工过程中桥梁受力良好,成桥时桥梁受力状态与目标受力状态亦吻合良好,所提出的计算方法准确有效。

Aiming at the present situation of larger second-phase dead load proportion, it is considered to stretch and tension all stay cables twice in the construction process, and that is firstly to stretch and tension every stay cable installed during the cantilever construction stage, and secondary to stretch and tension every cable after the second-phase dead load of pavement(i.e. final tension and cable adjustment). The calculation method of stretch tension of stay cable twice is proposed. The study results show that the bridge stress is good during the construction, the bridge stress when completed is also identical well with the targeted stress state,and the mentioned calculation method is accurate and effective.