考虑斜拉索抗弯刚度的矮塔斜拉桥索导管安装角度修正方法

文中针对短斜拉索实际抗弯刚度较大的情况,推导了考虑斜拉索抗弯刚度的索导管安装角度计算公式,以方便地计算出拉索在重力作用下的两端倾角变化值,该推导公式表明,两端倾角变化值除了与斜拉索索力、自重集度、索长有关外,还与拉索自身弹性模量、截面特性等因素有关。通过将索导管修正角度计算式应用于阿蓬江特大桥中,比较计算了不同索导管安装角度结果计算的差异。

Correction Method of Installation Angle of Cable Guide Pipe Considering Bending Rigidity of Low Tower Cable-stayed Bridge

In view of the large actual bending stiffness of short stay cables,a new formula for calculating the installation angle of cable guide tube considering the bending stiffness of cable was derived in this paper.This formula can conveniently calculate the change of angle between two ends of cable under the action of gravity.The variation of inclination angle is not only related to the cable force,gravity and length,but also related to the elastic modulus and cross-section characteristics of the cable itself.The formula of cable conduit correction angle obtained in this paper has been successfully applied to the Apengjiang River Bridge.In view of several cables in this project,the difference between the correction calculation results of different cable installation angles was also calculated and compared in this paper.