On the ductility of RC beam section: A revision and up to date of conclusions

• Published in: Engineering structures Vol. 322; p. 119105
• Main Authors: Lopes, Adelino V., Lou, Tiejiong, Lopes, Sergio M.R.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2025
• Subjects: Ductility; Ductility factor; Moment redistribution; Moment-curvature; Plastic hinge capacity; RC beams; Moment-curvature; Plastic hinge capacity; Ductility factor; RC beams; Ductility; Moment redistribution
• ISSN: 0141-0296
• DOI: 10.1016/j.engstruct.2024.119105

In the context of reinforced concrete (RC) structures, standards aim to relate the ductility of these structures to the ductility of the steels used in their construction. Among other requirements, EC8 requires the use of special ductility steels to achieve high ductility in structures. After reviewing the relevant literature, this study aims to evaluate the impact of various parameters on the ductility at the cross-section level of RC elements subjected to bending. The study concludes that there is no consensus on the assessment of ductility, nor a standardized framework for the various alternatives. Additionally: i) Some contradictions exist regarding the impact of fundamental parameters on the assessment of ductility; ii) A one-size-fits-all methodology is impractical given the diverse factors influencing ductility in RC elements. It is proposed to consider the ductility of RC element sections as a function of the mechanical ratio of tensioned reinforcement. A proposal is also made to enhance the ductility of cross-sections without significantly increasing their strength: by increasing the width of the section while keeping other parameters unchanged.
●Ductility of RC beam section reviewed.●A framework to analyse and evaluate the ductility.●Impact of mechanical ratio of reinforcement on ductility.●Impact of section parameters on ductility.●A way to improve ductility.