[1]时晓晔,梁岩,万德坤,等.桥梁顶推施工导梁屈曲分析及加固措施研究[J].郑州大学学报(工学版),2021,42(05):74-78.[doi:10.13705/j.issn.1671-6833.2021.05.006]
　Shi Xiaoyi,Liang Yan,Wan Dekun,et al.Buckling Analysis of Guide Beams in Bridge Jacking Construction and Study on Reinforcement Measures[J].Journal of Zhengzhou University (Engineering Science),2021,42(05):74-78.[doi:10.13705/j.issn.1671-6833.2021.05.006]

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桥梁顶推施工导梁屈曲分析及加固措施研究()

分享到：

《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:

42

期数:

2021年05期

页码:

74-78

栏目:

出版日期:

2021-09-10

文章信息/Info

Title:

Buckling Analysis of Guide Beams in Bridge Jacking Construction and Study on Reinforcement Measures

作者:

时晓晔; 梁岩; 万德坤; 陈淮; 方磊磊

郑州大学土木工程学院;光山县交通运输局;

Author(s):

Shi Xiaoyi; Liang Yan; Wan Dekun; Chen Huai; Fang Leilei;

School of Civil Engineering at Zhengzhou University; Guangshan County Transportation Bureau;

关键词:

钢箱梁桥; 导梁; 屈曲; 加固; 顶推法

Keywords:

steel box girder bridge;  guide beam;  buckling;  reinforcement;  incremental launching method

DOI:

10.13705/j.issn.1671-6833.2021.05.006

文献标志码:

A

摘要:

大跨钢箱梁在顶推施工过程中受力复杂，导梁临时结构受力性能对大跨钢箱梁顶推施工过程安全性影响较大。本文以某大跨钢箱梁顶推施工为工程实例，采用有限元软件ABAQUS建立其有限元计算模型，分析导梁在顶推过程中出现的导梁局部失稳现象和屈曲变形特征，探讨4种不同加固方案的导梁稳定性，确定了符合工程实际且便于施工的导梁加固方案。实施效果表明，加固后的导梁在后续顶推施工过程中未发生失稳现象，处于安全状态，确保了大跨钢箱梁顶推施工。本文研究成果可为同类工程施工提供参考。

Abstract:

The large-span steel box girder has complex forces during the jacking construction process, and the temporary structure of the guide beam has a greater impact on the safety of the long-span steel box girder jacking construction process. In this paper, a large-span steel box girder pushing construction is taken as an engineering example. According to the instability of the guide beam at the variable cross-section that occurs during the actual pushing process, the finite element software ABAQUS is used to establish its finite element calculation model, combined with the on-site guide beam instability, the section deformation verifies the accuracy of the finite element model. By analyzing the local instability and buckling deformation characteristics of the guide beam, the stability of the guide beam under four different reinforcement schemes of one row of longitudinal stiffeners, two rows of longitudinal stiffeners, one row of longitudinal stiffeners and two row of vertical combined stiffeners, and two rows of longitudinal and two rows of vertical combined stiffeners are further studied. According to the analysis of the calculation results, the first order instability characteristic values of the guide beams in the four reinforcement schemes are increased by 1.9%, 63.8%, 26.0% and 93.5%, respectively. The effect of longitudinal stiffeners is better than that of vertical stiffeners. Combining the actual force situation of the site structure, the longitudinal stiffening ribs can be preferentially used for reinforcement. According to the results of numerical analysis and the time requirements of high-speed traffic, a guide beam reinforcement plan that conforms to the actual project and is convenient for construction is determined: two rows of longitudinal stiffeners are used to strengthen. The reinforcement effect shows that the reinforced guide beam did not lose stability during the follow-up jacking construction process, ensuring the safety of the follow-up jacking construction of the steel box girder. In view of the uncertainty of the jacking construction process, the jacking construction process should be monitored in real time, and the beam should be dropped in time when abnormal conditions occur. The research results of this article can provide references for similar projects.

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