主索鞍与塔顶的相对位置、索鞍预偏量、索鞍顶推原则是悬索桥课程教学难点。文章对此进行了深入剖析，补充了主索鞍与塔顶的相对位置结构图，推导了相对位置及预偏量计算公式，既丰富了教材内容，又有助于学生理解，提高学习兴趣。

In the teaching of suspension bridge, the main cable saddle and the relative position of the tower, cable saddle preliminary deviator, cable saddle pushing principle understanding are difficult. The structure chart for the relative position of the saddle and the tower should be appropriately complemented, and the relative position and preliminary deviator calculation formula were deduced. The main rope saddle line and the center line of the main tower generally are not coincidence, preliminary deviator is to point out an empty line state to ensure the main tower vertical and set the rope saddle offset, and jacking times and pushing quantity can be adjusted. It enriched the content of the teaching material which can help students understand this part and improve their learning interest of the suspension bridge.

重庆市高等教育教学改革研究项目(103140);中国交通教育研究会教育科学研究课题(交教研1002-93)