悬索桥成桥主缆线形计算的混合线形理论法

Mixed Line-type Method of Main Cable under Dead Load State of Suspension Bridge

基于悬索桥在恒载作用下的力学特点,对悬索桥的主缆线形及无应力长度的解析计算方法进行研究,在抛物线理论和悬链线理论的基础上推导出混合线形理论近似显式方法,以此确定恒载状态下成桥线形、主缆无应力长度。与精确计算方法相比,该方法计算过程简单且精度高于抛物线法,精度满足成桥几何线形的初步设计要求,适用于主缆线形和内力的初步计算。

Based on the mechanical feature of suspension bridge under dead load,analytical theoretics for line-type of main cable and zero-stress length of suspender are studied.Based on parabola method and catenaries method,mixed line-type method is deduced.The line-type of construction state under dead load,zero-stress length of suspender can be calculated.Compared to accurate method,approximate explicit solution for mixed line-type method simplifies the calculation greatly,which is more accurate than parabola method,its precision meet primary design require,and is applicable to primary the calculation of main cable for suspension bridge.