节线法在不等高三塔大跨悬索桥主缆线形分析中的应用

结合某不等高三塔大跨悬索桥,以节线法理论为基础,通过常用的Excel软件反复迭代计算其主缆的初始平衡位置以及主缆拉力,为验证该算法的可行性及工程精度,以此为基础建立Midas全桥结构有限元模型,并利用Midas悬链线索单元进行更精确的分析,得到悬索桥初始平衡位置以及主缆拉力。通过对比两种计算方法的结果可以发现,节线法这一近似计算方法能够满足工程需要,且使用方便.无需复杂的编程计算,具有一定的实用意义,可为同类型桥梁主缆线形分析提供参考。

Application of Pitch Line Method in Main Cable Alignment Analysis of Unequal Three-pylon Long-span Suspension Bridge

Combined with an unequal three-pylon long-span suspension bridge,on the basis of the pitch line method theory,the common Excel software is used to calculate the initial equilibrium position of its main cable and the tension of the main cable iteratively in order to verify the feasibility and engineering accuracy of this algorithmic.Based on this,the Midas finite element model of the whole bridge structure is established,and the Midas catenary cable unit is utilized to carry out the more precise analysis in order to obtain the initial equilibrium position of suspension bridge and the tension of the main cable.After comparison,the results of two calculation methods show that this approximate calculation method of pitch line method can satisfy the engineering demands and is convenient to use.No complicated programming calculations are required.This method has a certain practical significance and can he referred for the main cable alignment analysis of the similar bridges.