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王   飛

（中鐵十一局集團第五工程有限公司 ，重慶 400037)

摘   要 ：為了降低超高大跨鋼混結構斜拉橋極限承載力的計算相對誤差，準確分析結構的穩定狀態，提出一種非線性擬靜態建模分析方法。選取反映結構穩定性的設計指標，構建穩定控制指標向量。結合簡化力學模型與最大剛度矩陣，明確臨界條件，建立斜拉橋穩定性非線性擬靜態分析模型。以某大型超高大跨斜拉橋為例， 利用該分析模型獲得分析結果如下：位于斜拉橋兩側的立柱分別處于穩定狀態和失穩狀態、位于橋跨之間的立  柱達到臨界穩定狀態后逐漸失穩。該模型計算的極限承載力相對誤差均在 0. 50 以下，與真實值的偏差較小，說明構建的模型能夠較準確低計算出結構極限承載力，有效分析了結構穩定性。

關鍵詞：大跨度 ；鋼混結構 ；斜拉橋結構 ；非線性擬靜態建模 ；穩定性分析

中圖分類號：TU311 . 4           

文獻標志碼：A           

文章編號： 1005- 8249   (2024)   06- 0138- 05 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.06.025

 

WANG Fei

(China Railway 11th Bureau Group 5th Engineering Co. ，Ltd. ，Chongqing 400037 ,  China)

Abstract: In order to reduce the relative error in the calculation of the ultimate bearing capacity of ultra high span steel-concrete cable-stayed bridges and accurately analyze the stable state of the structure, this article proposes a nonlinear quasi-static modeling analysis method. Select design indicators that reflect structural stability and construct a vector of stability control indicators. By combining a simplified mechanical model with the maximum stiffness matrix, clarifying the critical conditions, a nonlinear quasi-static analysis model for the stability of cable-stayed bridges is established. Taking a large and ultra high span cable-stayed bridge as an example, the analysis model was used to obtain the following results: Column 1 is in a stable state, Column 2 is in an unstable state, and Column 3 gradually becomes unstable after reaching the critical stable state. The relative error of the ultimate bearing capacity calculated by this model is below 0.50, and the deviation from the true value is small, indicating that the constructed model can accurately calculate the ultimate bearing capacity of the structure and effectively analyze the stability of the structure.

Keywords: large span; steel concrete structure; cable-stayed bridge structure; nonlinear quasi-static modeling; stability analysis;

作者簡介： 王    飛  (1988—) ,   男 ，碩士，工程師，研究方向：超高大跨度橋梁耐久性能及質量控制。

收稿日期：2023- 07- 14