Buckling Analysis of Guide Beams in Bridge Jacking Construction and Study on Reinforcement Measures
[1]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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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
42
Number of periods:
2021 05
Page number:
74-78
Column:
Public date:
2021-09-10
- Title:
- Buckling Analysis of Guide Beams in Bridge Jacking Construction and Study on Reinforcement Measures
- Keywords:
- steel box girder bridge; guide beam; buckling; reinforcement; incremental launching method
- CLC:
- -
- 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.
- References:
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Last Update:
2021-10-11