Evaluation of Moment Redistribution in Normal-Strength and High-Strength Reinforced Concrete Beams
Publication: Journal of Structural Engineering
Volume 140, Issue 10
Abstract
This article presents an investigation of redistribution of moments in normal-strength concrete (NSC) and high-strength concrete (HSC) continuous beams. A nonlinear computer model is introduced and validated by experimental results of HSC continuous specimens. A numerical test is performed on two-span continuous beams where the concrete strength varies between 30 and 90 MPa so as to cover both NSC and HSC beams. Various tensile steel ratios over the center support and midspan are used. Some rules related to moment redistribution are examined. The study confirms that the moment redistribution is dependent on the stiffness of the critical sections. The analysis also indicates that full redistribution of moments is more likely to be developed in HSC beams than in NSC beams. The results of a parametric study, where the ratio is fixed at 0.8, show that at a given steel ratio, a higher concrete strength registers higher redistribution of moments except when . The effect of concrete strength on the moment redistribution is generally reflected in various codes.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
This research is sponsored by FEDER funds through the program COMPETE (Programa Operacional Factores de Competitividade) and by national funds through FCT (Fundação para a Ciência e a Tecnologia) under the project PEst-C/EME/UI0285/2013. The work presented in this paper has also been supported by FCT under Grant No. SFRH/BPD/66453/2009.
References
American Concrete Institute (ACI) Committee 318. (2011). Building code requirements for structural concrete (ACI 318-11) and commentary, American Concrete Institute, Farmington Hills, MI.
Arslan, G., and Cihanli, E. (2010). “Curvature ductility prediction of reinforced high-strength concrete beam sections.” J. Civil Eng. Manag., 16(4), 462–470.
Bernardo, L. F. A., Andrade, J. M. A., and Lopes, S. M. R. (2012). “Softened truss model for reinforced NSC and HSC beams under torsion: A comparative study.” Eng. Struct., 42, 278–296.
Bernardo, L. F. A., and Lopes, S. M. R. (2004). “Neutral axis depth versus flexural ductility in high-strength concrete beams.” J. Struct. Eng., 452–459.
Bernardo, L. F. A., and Lopes, S. M. R. (2009). “Plastic analysis of HSC beams in flexure.” Mater. Struct., 42(1), 51–69.
Bernardo, L. F. A., and Lopes, S. M. R. (2013). “Plastic analysis and twist capacity of high-strength concrete hollow beams under pure torsion.” Eng. Struct., 49, 190–201.
Canadian Standards Association (CSA). (2004). “Design of concrete structures.” A23.3-04, Mississauga, ON, Canada.
Carmo, R. N. F., and Lopes, S. M. R. (2005). “Ductility and linear analysis with moment redistribution in reinforced high-strength concrete beams.” Can. J. Civil Eng., 32(1), 194–203.
Carmo, R. N. F., and Lopes, S. M. R. (2008). “Available plastic rotation in continuous high-strength concrete beams.” Can. J. Civil Eng., 35(10), 1152–1162.
European Committee for Standardization (CEN). (2004). “Eurocode 2: Design of concrete structures—Part 1-1: General rules and rules for buildings.”, European Committee for Standardization, Brussels, Belgium.
Cucchiara, C., Fossetti, M., and Papia, M. (2012). “Steel fibre and transverse reinforcement effects on the behaviour of high strength concrete beams.” Struct. Eng. Mech., 42(4), 551–570.
Gattesco, N., Macorini, L., and Fragiacomo, M. (2010). “Moment redistribution in continuous steel-concrete composite beams with compact cross section.” J. Struct. Eng., 193–202.
International Federation for Structural Concrete (FIB). (2012). “Model Code 2010.” Bulletins 55 and 56, Lausanne, Switzerland.
Kassoul, A., and Bougara, A. (2010). “Maximum ratio of longitudinal tensile reinforcement in high strength doubly reinforced concrete beams designed according to Eurocode 8.” Eng. Struct., 32(10), 3206–3213.
Khadiranaikar, R. B., and Awati, M. M. (2012). “Concrete stress distribution factors for high-performance concrete.” J. Struct. Eng., 402–415.
Kwan, A. K. H., Au, F. T. K., and Chau, S. L. (2004). “Theoretical study on effect of confinement on flexural ductility of normal and high-strength concrete beams.” Mag. Concr. Res., 56(5), 299–309.
Lopes, A. V., Lopes, S. M. R., and Carmo, R. N F. (2012). “Effects of the compressive reinforcement buckling on the ductility of RC beams in bending.” Eng. Struct., 37, 14–23.
Lopes, S. M. R., Harrop, J., and Gamble, A. E. (1997). “Study of moment redistribution in prestressed concrete beams.” J. Struct. Eng., 561–566.
Lou, T., Lopes, S. M. R., and Lopes, A. V. (2014). “FE modeling of inelastic behavior of reinforced high-strength concrete continuous beams.” Struct. Eng. Mech., 49(3), 21pp.
Perera, S. V. T. J., and Mutsuyoshi, H. (2013). “Shear behavior of reinforced high-strength concrete beams.” ACI Struct. J., 110(1), 43–52.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 140 • Issue 10 • October 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 10, 2013
Accepted: Oct 29, 2013
Published online: May 13, 2014
Published in print: Oct 1, 2014
Discussion open until: Oct 13, 2014
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.