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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 48
Edited by: B.H.V. Topping and M.B. Leeming
Paper V.1

Plastic Design of Steel Beams in Torsion

N.S. Trahair and Y.-L. Pi

Centre for Advanced Structural Engineering, The University of Sydney, Sydney, Australia

Full Bibliographic Reference for this paper
N.S. Trahair, Y.-L. Pi, "Plastic Design of Steel Beams in Torsion", in B.H.V. Topping, M.B. Leeming, (Editors), "Innovation in Civil and Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 193-199, 1997. doi:10.4203/ccp.48.5.1
There is little advice available on how to design for torsion effects in steel structures, except by using elastic analysis and first yield design. However, elastic analysis is cumbersome and time-consuming, while first yield design for strength is unnecessarily conservative.

This paper develops a simple method of plastic analysis of compact I-section members in torsion, and shows how this can be applied in strength design to produce economical structures. A simple approximate method of elastic analysis for serviceability design is also presented.

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