悬索桥缆索系统的数值分析法

针对已有计算方法的不足之处,提出了一种各种状态下悬索桥主缆线形的精确数值算法和索股、吊索长度的计算方法.该方法能全面考虑温度、各种鞍座及主塔的约束作用对主缆线形的影响,并能很好地处理主缆与鞍座的接触问题,可以方便地模拟塔顶鞍座临时固接和顶推这一悬索桥特有的施工工况,索股长度计算时能精确考虑悬索桥锚跨索股的空间走向,具有计算精度高、速度快的优点.利用该方法编制的软件已用在江阴大桥和润扬大桥的设计和施工中.

Numerical Analysis Method for Cable System of Suspension Bridges

In view of the drawbacks of the existed methods,an accurate numerical analysis method to calculate the cable shape in various cases and the length of cable strand of suspension bridges is presen-ted.This method can take into account the effect of tower saddle,spray saddle and restriction of tower ~exactly ,and can emulate conveniently saddle fixing with tower temporarily and saddle jacking which is a special construction case in suspension bridges.In calculating the unstrained length of cable strands,an algorithm is developed to consider the 3-dimensional shape of anchor span strands.It is shown that this method is of high accuracy and efficiency.The effect of saddle on the cable shape is demonstrated by a numerical example.Program developed according to this method has been applied to the Jiangyin Yangtze the River Bridge and the Runyang Yangtze River Bridge.