Negative Shear Lag in Cantilever Box Girder with Constant Depth
Publication: Journal of Structural Engineering
Volume 113, Issue 1
Abstract
Shear lag and negative shear lag effect in cantilever box girders are analyzed through a variation approach and finite element techniques. The complex distribution of bending stresses under symmetrical loading on the flanges of cellular sections are also presented. In this paper, the supposition of the spanwise displacement on flanges follows a quartic parabolic variation. However, expressions are derived to determine the region of negative shear lag effect with the interrelation of span/width parameters involved. The theoretical results thus obtained are compared with a plexiglass model test. Finally, conclusions are drawn with regard to further study and research.
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References
1.
Kuzmanovic, B. O., and Graham, H. J., “Shear Lag in Box Girder,” Journal of the Structural Division, ASCE, Vol. 107, No. ST9, Sept., 1981, pp. 1701–1712.
2.
Reissner, E., “Analysis of Shear Lag in Box Beams by the Principle of Minimum Potential Energy,” Quarterly of Applied Mathematics, Vol. IV, No. 3, Oct., 1945, pp. 268–278.
3.
Foutch, D. A., and Chang, P. C., “A Shear Lag Anomaly,” Journal of the Structural Division, ASCE, Vol. 108, No. ST7, July, 1982, pp. 1653–1657.
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Guo, J. G., et al., “Analysis of Shear Lag Effect in Box Girder Bridge,” China Civil Engineering Journal (Quarterly), Vol. 16, No. 1.
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Moffatt, K. R., and Dowling, P. J., “Shear Lag in Steel Box Girder Bridges,” The Structural Engineer, Vol. 53, No. 10, 1975, pp. 439–448.
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Copyright © 1987 ASCE.
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Published online: Jan 1, 1987
Published in print: Jan 1987
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