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王   飞

（中铁十一局集团第五工程有限公司 ，重庆 400037)

摘   要 ：为了降低超高大跨钢混结构斜拉桥极限承载力的计算相对误差，准确分析结构的稳定状态，提出一种非线性拟静态建模分析方法。选取反映结构稳定性的设计指标，构建稳定控制指标向量。结合简化力学模型与最大刚度矩阵，明确临界条件，建立斜拉桥稳定性非线性拟静态分析模型。以某大型超高大跨斜拉桥为例， 利用该分析模型获得分析结果如下：位于斜拉桥两侧的立柱分别处于稳定状态和失稳状态、位于桥跨之间的立  柱达到临界稳定状态后逐渐失稳。该模型计算的极限承载力相对误差均在 0. 50 以下，与真实值的偏差较小，说明构建的模型能够较准确低计算出结构极限承载力，有效分析了结构稳定性。

关键词：大跨度 ；钢混结构 ；斜拉桥结构 ；非线性拟静态建模 ；稳定性分析

中图分类号：TU311 . 4           

文献标志码：A           

文章编号： 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;

作者简介： 王    飞  (1988—) ,   男 ，硕士，工程师，研究方向：超高大跨度桥梁耐久性能及质量控制。

收稿日期：2023- 07- 14