Derivation of strain hardening factor from mill tests

Byfield, M.P. and Dhanalakshmi, M. (2002) Derivation of strain hardening factor from mill tests. Advances in Steel Structures (ICASS 02), Hong Kong, China. 09 - 11 Dec 2002.

Record type: Conference or Workshop Item (Paper)

Abstract

Experimental bending tests carried out to assess the reliability of the plastic moment of resistance formula revealed experimental bending strengths that typically exceeded their theoretical plastic moment capacities by an average of 18%. These findings are based on tests carried out on lightweight sections, whose stress strain characteristics showed strain hardening immediately after yielding, with no significant zone of plasticity. It is not understood whether the results are transferable to heavier sections and this work attempts to answer the scale effects question. A method for predicting the full (elastic and post-plastic) moment-rotation curves for laterally restrained steel beams, based on stress-strain data from mill tests is explained. A comparison between experimental and theoretical moment vs. end rotations shows that the method is capable of predicting strength and ductility with a high degree of accuracy. Furthermore, a survey of mill test results from a variety of section sizes is presented, the results of which are used to characterise strain-hardening effects for sections with differing span to depth ratios. Thus, the effect that section size and span to depth ratio has on strength and ductility is assessed.

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