RESEARCH ARTICLE


Comparisons of Codal Detailing Rules for Curvature Ductility and Numerical Investigations



Michelangelo Laterza*, 1, Michele D’Amato1, Laksiri P. Thanthirige1, Franco Braga2, Rosario Gigliotti2
1 DiCEM, Department of Architecture, Environment, Cultural Heritage: University of Basilicata, Via Lazazzera, 75100 Matera, Italy
2 DiSG, Department of Structural Engineering, “Sapienza” University of Rome, Via Eudossiana, 00185, Rome, Italy


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Creative Commons License
© 2014 Laterza et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the DiCEM, Department of Architecture, Environment, Cultural Heritage: University of Basilicata, Via Lazazzera, 75100 Matera, Italy; Tel: +3908351971462; Fax: +3908351971497; E-mail: michelangelo.laterza@unibas.it


Abstract

In moment resisting frame structures special detailing rules are applied to critical regions of primary columns and beams to ensure adequate curvature ductility. This is necessary for dissipating earthquake energy through hysteretical behavior of critical regions where inelastic flexural excursions occur. In this paper codal detailing rules for designing longitudinal and transverse reinforcement of primary elements as function of curvature ductility are assessed. Four seismic codes are considered: Italian code, New Zealand code, Eurocode 8 and American code. Non-linear monotonic momentcurvature analyses are performed on some sections of columns and beams detailed in according to the considered codal provisions. In the analyses the confinement effects within the concrete core have been taken into account as well. The paper concludes comparing the measured curvature ductility of the studied sections with the expected one by the codal provisions within the critical regions.

Keywords: Critical regions, curvature ductility, design equations, longitudinal reinforcement, RC beams, RC columns, transverse reinforcement.