关键词: 大跨度拱桥, 缆索吊装系统, 有限元稳定性分析, 临界荷载系数, 失稳模态

Abstract: Based on theory of structural stability，the solution procedure and principle of finite element method are introduced in brief under the analysis of structural stability．With the finite element analysis．the stability of the tower is studied by taking the cable—hoisting erection system of the Wujiang River Bridge in the Pengshui City as engineering background．Through multlvle solution by iterative method．the critical load factors and buckling mode shapes of the tower are obtained under the most disadvantageous construction work condition，providing theories foundation for the construction control of that bridge．

Key words: long-span arch bridge, cable·hoisting erection system, finite element analysis of stability, critical load factors, buckling mode shapes