Abstract
This paper deals with the experimental determination of ductility of ultra-high-performance fiber-reinforced concrete (UHPFRC) columns with longitudinal passive reinforcement, tested under combined axial and alternate flexural load. The influence of axial load has been studied, as well as the presence or not of a reduced shear reinforcement. One companion column made of ordinary concrete and with a high shear reinforcement ratio has also been tested for comparison. The ductility has been assessed with energy dissipation and ductility coefficient calculations. In addition, the maximum bending moment has been compared with theoretical calculation, using the material characteristics determined from characterization tests. The paper concludes that UHPFRC columns with a longitudinal reinforcement which have not been specifically designed for seismic resistance do display a ductility coefficient higher than 2 and a noticeable ability to protect the rebars from buckling, but have a rather high decrease of bending moment under the succession of series of alternate flexural load cycles.
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Acknowledgments
Most of the graphs displayed in this article have been plotted with the Matplotlib Library (Hunter 2007) of the Python programming language.
The works detailed in this paper were carried out within the BADIFOPS research project, aiming at developing ductile solutions of UHPFRC structures for earthquake-resistant applications, where optical fibers structural health monitoring (SHM) can be fruitfully applied. BADIFOPS is a project sponsored by the French government (2011–2014) within the Design and Build for Sustainable Growth program of the Civil Engineering Department Unit of the Ministry in Charge of Sustainable Growth (Grant No. 10 MGC S010). Partners are Eiffage Company, Centre Scientifique et Technique du Bâtiment (CSTB) (research center for buildings), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) (public works research institute), and Sétra, now Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement (CEREMA) (Highways Agency). The authors declare that they have no conflict of interest.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 1 • January 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 8, 2017
Accepted: Jun 4, 2018
Published online: Oct 19, 2018
Published in print: Jan 1, 2019
Discussion open until: Mar 19, 2019
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