大跨度悬索桥主缆线形影响参数分析

摘要

主缆无应力长度和空缆架设线形是大跨度悬索桥主缆线形控制的2个关键点。文中推导了索鞍处主缆无应力长度修正公式和温度修正公式，以及空隙率影响计算公式，采用MathCAD编制了主缆分析程序，分析了主缆弹性模量、截面面积、索股自重等因素对无应力长度的影响，研究了弹性模量、温度、空隙率对空缆状态和索鞍预偏量的影响。%Unstressed length of the main cable and the empty shape of the main erection are two key points of the main cable shape control of long‐span suspension bridge .T his article derives the correc‐tion formula of the cable saddle unstressed length of the main cable and rhe temperature and the for‐mula about the influence of the porosity ,and uses MathCAD prepares the main cable analysis proce‐dure to analyze influence of the main cable modulus of elasticity ,cross‐sectional area ,weight ,etc im‐pacts for the unstressed length ,and studies the influence of elastic modulus ,temperature and porosity for the cable status and pre‐displacement of cable saddle .