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| Theoretical analysis for shear-lag effect of variable box section continuous girder based on bar simulation method |
| Received:May 16, 2023 Revised:June 13, 2023 |
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| DOI：10.7511/jslx20230516001 |
| KeyWord:bridge engineering shear lag effect bar simulation method variable cross-section continuous box girder cantilever construction |
| Author | Institution |
| 冀伟 |
兰州交通大学 土木工程学院, 兰州 |
| 石旭辉 |
兰州交通大学 土木工程学院, 兰州 |
| 罗子钧 |
兰州交通大学 土木工程学院, 兰州 |
| 罗奎 |
湖南大学 土木工程学院, 长沙 |
| 黄逸航 |
兰州交通大学 土木工程学院, 兰州 |
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| Abstract: |
| Aiming at the problem that the existing methods for shear lag effect analysis are difficult to apply to a variable cross-section continuous box girder,this paper proposes a methods for shear lag effect analysis for variable cross-section continuous concrete box girder based on the bar analogy method.Firstly,the governing differential equation of shear lag of variable cross-section continuous box girder is established by using the bar analogy method.Secondly,the correctness and applicability of the proposed method are verified by finite element analysis results and experimental results,and the influence of different element types on shear lag is analyzed.Finally,the shear lag effect in the cantilever construction process of three-span concrete continuous box girder is analyzed.The results show that the shear lag effect of the flange plate on the three-span variable cross-section continuous beam is the most obvious at the support,followed by the shear lag effect at the middle of the middle span,and the shear lag effect between the middle support and the middle span is negligible.During the whole cantilever construction process of a three-span continuous beam,the shear lag effect of the upper and lower flange plates of the block 0 radually decreases.After the bridge is completed,the shear lag effect of the upper and lower flange plates of the block 0 increases.During the whole cantilever construction process of the three-span continuous beam,the positive shear lag effect of the upper and lower flange plates of block 1 gradually decreases.The shear lag effect of the upper and lower flange plates of block 1 is reduced.The conclusions can provide reference for the analysis and calculation of shear lag effect of variable cross-section continuous beams. |
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