特大跨径钢桁拱吊装索力计算方法探讨

Analysis on the Calculation Method for Cable Force of Super Long-span Steel Truss Arch Dridge

采用缆索吊装斜拉扣挂施工方法进行特大跨径钢桁架拱安装时,对拱肋的安装标高和索力精度要求较高。传统的索力计算方法虽力学概念清晰,计算简便,但精度较低,只适用于节段数较少的小跨径拱桥。文章总结了传统方法的优缺点,并阐述了ANSYS的零阶优化法在钢桁架拱吊装索力计算中应用。

The accuracy of elevation of arch rib segment and cable force is required high during the installation of super long-span steel truss arch rib with cable-stayed suspension method. The traditional calculation method of cable force with advantages of clear mechanical conception and easy calculation is only applicable to small span arch bridge. According to this problem,zero order optimization method of ANSYS is proposed in calculation of cable force during installation of steel truss arch rib,the advantages and disadvantages of the traditional calculation method are analysed.