武芳文¹，赵 雷²
（1 长安大学公路学院，西安710064；2 西南交通大学土木工程学院，成都610031）

[摘要]  考虑结构的非线性和构件的极限承载能力，计入施工过程的变形和应力的叠加效应，对南京长江第三大桥初步设计方案（双塔双柱钢斜拉桥）进行了分析，重点研究施工全过程中的稳定性问题。计算得出结构的线性稳定安全系数为4. 6~9.6，非线性稳定安全系数为2.6~7.9。表明该桥在施工过程中的线性稳定性和非线性稳定性都是足够的。
[关键词]  钢斜拉桥；非线性稳定性；材料；几何；安全系数；极限承载能力

    Stability analysis of long-span steel cable-stayed bridge
    Wu Fangwen¹，Zhao Lei²
    ( l Chang'an Univ., Xi'an 710064 ,China; 2 School of Civil  Engineering, Southwest Jiaotong Univ., Chengdu 610031, China )

Abstract:  The Nanjing No.3 Bridge (steel cable-stayed bridge with tvvo towers and tvvo poles)  are investigated by considering the nonlinearity of structure and the ultimate loacFcarrying capacity of components. And in the investigation, the superposition effects of deformations and stresses are also included during the construction. The research is focused on the stability of structure during the construction. The research result shows that the elastic stability factors are 4.6 to 9.6 and the nonlinear stability factors are 2.6 to 7.9 , which indicate that the elastic stability and nonlinear stability are adequate in construction stage.
Keywords: steel cable-stayed bridge; nonlinear stability; material; geometric; safety factor; ultimate load capacity