Analysis of Shear Lag Effects in Box Girders With Variable-Thickness Flanges

ZHAO Qingyou; ZHANG Yuanhai; SHAO Jiangyan

doi:10.21656/1000-0887.390259

Volume 40 Issue 6

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ZHAO Qingyou, ZHANG Yuanhai, SHAO Jiangyan. Analysis of Shear Lag Effects in Box Girders With Variable-Thickness Flanges[J]. Applied Mathematics and Mechanics, 2019, 40(6): 609-619. doi: 10.21656/1000-0887.390259

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Analysis of Shear Lag Effects in Box Girders With Variable-Thickness Flanges

doi: 10.21656/1000-0887.390259

School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, P.R.China

Funds: The National Natural Science Foundation of China(51468032)

Received Date: 2018-09-30
Rev Recd Date: 2019-04-25
Publish Date: 2019-06-01

Abstract

Abstract

For concrete box girders with flanges of linearly variable thicknesses along the cross section widths, shear lag effects were analyzed according to the potential energy variation principle. The additional deflection caused by the shear lag effect was used as the generalized displacement to describe the shear lag deformation state, in view of the influence of the axial force equilibrium condition on the shear lag. The calculation results of several simply supported box girders subjected to uniform loads and concentrated loads were compared. The results show that, the proposed method gives stresses in good agreement with those obtained from the finite element method, which confirms the correctness of this method. Compared with the simplified calculation method for box girders with equivalent uniformthickness flanges, this method has enhanced accuracy for real box girders with variablethickness flanges, and the error reduction is up to 5.65%.
- thin-walled box girder,
- shear lag effect,
- energy variation method,
- variable-thickness flange,
- axial force balance

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References(18)

References

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