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武芳文¹，趙 雷²
（1 長安大學(xué)公路學(xué)院，西安710064；2 西南交通大學(xué)土木工程學(xué)院，成都610031）

[摘要]  考慮結(jié)構(gòu)的非線性和構(gòu)件的極限承載能力，計入施工過程的變形和應(yīng)力的疊加效應(yīng)，對南京長江第三大橋初步設(shè)計方案（雙塔雙柱鋼斜拉橋）進行了分析，重點研究施工全過程中的穩(wěn)定性問題。計算得出結(jié)構(gòu)的線性穩(wěn)定安全系數(shù)為4. 6~9.6，非線性穩(wěn)定安全系數(shù)為2.6~7.9。表明該橋在施工過程中的線性穩(wěn)定性和非線性穩(wěn)定性都是足夠的。
[關(guān)鍵詞]  鋼斜拉橋；非線性穩(wěn)定性；材料；幾何；安全系數(shù)；極限承載能力

    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