Experiments on Distortional Buckling of I-Beams
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Volume 133, Issue 7
Abstract
This paper describes a test program on full-scale fabricated simply supported I-beams with central concentrated load and an effective lateral brace at the midspan of the top compression flange that was performed mainly with the aim of experimental verification and investigation of distortion in doubly symmetric I-section beams. The experimental ultimate loads were compared with the buckling loads of the specimens determined by using the so-called Southwell, Modified, and Massey extrapolation techniques, and in most of the cases very little discrepancy was found between the maximum test and extrapolated loads. Moreover, the experimental beam strengths were compared with the design strengths predicted by the American AISC/LRFD and the Australian AS4100 specifications. Generally, the two specifications provide unconservative predictions in the inelastic range of structural response as the beam length decreases and inelastic behavior becomes more intense. However, the AS4100 specification provides conservative predictions in comparison with the AISC/LRFD specification.
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Acknowledgments
The test program was supported by a grant from the Iranian Ministry of Sciences, Researches, and Technology specified for postgraduate research. The funding was provided as a result of great attempts made by Dr. Mirzayee, the Head of the Engineering Faculty of Urmia University, which are gratefully acknowledged. Further, the experiments would not have been possible without the help of the laboratory technician Jaafar Azimzadeh. Finally, the writers would like to express their profound and sincere appreciation to Professor M. A. Bradford, Professor N. S. Trahair, Professor B. W. Schafer, Professor T. M. Roberts, Dr. Z. Vrcelj, Dr. H. R. Ronagh, and Pedro Simão for their great help in providing articles and presenting constructive comments regarding this research.
References
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 7 • July 2007
Pages: 1009 - 1017
Copyright
© 2007 ASCE.
History
Received: Jul 18, 2005
Accepted: Nov 27, 2006
Published online: Jul 1, 2007
Published in print: Jul 2007
Notes
Note. Associate Editor: Benjamin W. Schafer
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