Abstract: The limitation span of whole self-anchor cable-stayed bridge system is discussed in terms of material strength of stay cable and girder at the current level of material and construction． Research results show that girder strength under transverse limit static gust wind load is the main factor to limit the increase of cable-stayed bridge span; girder strength under live load is secondary factor; stay cable strength and its support efficiency is of little effect on the limitation span of cable-stayed bridge． The primary problem of increasing cable-stayed bridge span is to improve the lateral stiffness of girder． The results provide some reference in concept design for super long span cable-stayed bridge．

Key words: cable-stayed bridge, limitation span, limit static gust wind, sag effect, lateral stiffness

摘要： 从斜拉索和主梁的材料强度入手探讨了当前材料水平和施工水平下全自锚斜拉桥结构体系的极限跨径。研究结果表明: 横向静阵风作用下的主梁强度是限制斜拉桥跨径增大的主要因素，活载作用下的主梁强度居于次要地位，而斜拉索的强度和效率对斜拉桥极限跨径的影响最小; 斜拉桥极限跨径突破的首要问题是提高主梁的侧向刚度。研究成果可供超大跨度斜拉桥概念设计时参考

关键词: 斜拉桥, 极限跨径, 极限静阵风, 垂度效应, 侧向刚度