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Moment redistribution effects in beams

Scott, R.H.; Whittle, R.T.

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Authors

R.H. Scott

R.T. Whittle



Abstract

Moment redistribution in beams has traditionally been considered as an ultimate limit state (ULS) phenomenon closely associated with considerations of reinforcement ductility. This paper demonstrates that a significant proportion of this redistribution will almost always occur at the serviceability limit state (SLS) because of the mismatch between the flexural stiffnesses assumed when calculating moments for the ULS and those actually occurring at the SLS due to variations in the reinforcement layout along the member and the influence of cracking. This is demonstrated analytically in the paper and comments are made concerning the current recommendations in BS 8110 concerning member stiffness. Tests on 33 two-span beams are then presented, parameters investigated being values of redistribution, beam depth, reinforcement arrangements, concrete strength and the effect of brittle reinforcement. The results confirm that there is significant redistribution at the SLS and that there is scope for increasing the permissible limits for redistribution beyond those currently prescribed in design codes. This is supported by further modelling although it is shown that considerations of crack width may become a limiting factor.

Citation

Scott, R., & Whittle, R. (2005). Moment redistribution effects in beams. Magazine of Concrete Research, 57(1), 9-20. https://doi.org/10.1680/macr.57.1.9.57870

Journal Article Type Article
Publication Date 2005-02
Deposit Date Jun 2, 2008
Publicly Available Date Jun 2, 2008
Journal Magazine of Concrete Research
Print ISSN 0024-9831
Electronic ISSN 1751-763X
Publisher ICE Publishing
Peer Reviewed Peer Reviewed
Volume 57
Issue 1
Pages 9-20
DOI https://doi.org/10.1680/macr.57.1.9.57870
Keywords Ultimate limit state, ULS, Serviceability limit state, SLS, Reinforcement ductility, BS 8110.
Publisher URL http://www.thomastelford.com/journals/abstract.asp?JournalTitle=Magazine%20of%20Concrete%20Research&ArticleID=3068&JournalMenu=true&JournalID=9

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