Flexural Capacity of Reinforced Strain-Hardening Cementitious Composite Beams: Experimental Results and Analysis
Publication: Journal of Structural Engineering
Volume 144, Issue 12
Abstract
The results of an experimental investigation of steel-reinforced beams comprising fiber-reinforced strain-hardening cementitious composites are presented. Polyvinyl alcohol fibers were used in the cementitious mix to achieve significant tensile deformation capacity, which contributed significantly to the flexural resistance. A total of 18 specimens were tested under four-point bending with shear span ratios of 2 and 3.5 to ensure flexural failure. The fiber-reinforced composite’s behavior in tension was marked by the formation of multiple cracks that resulted in strain-hardening postcracking behavior and sustained tensile strength up to large tensile strain magnitudes. Variables of the experimental program were the amount of tension and compression steel reinforcement, the availability of confinement (stirrups), and the shear span aspect ratio. Test results illustrated the beneficial action of the fibers in the tensile zone of the beam through bridging of cracks and transferring loads, while in the compressive zone of the beams, fibers restrained lateral expansion and led to ductile compressive response. Analytical expressions to estimate the flexural strength of steel-reinforced, strain-hardening cementitious composite beams were also derived and correlated with the experimental results.
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Acknowledgments
The authors gratefully acknowledge Kuraray Europe GmbH for its generous supply of PVA fibers for this research. All experiments were conducted in the facilities of the University of Cyprus. The assistance provided by Special Scientist Dr. N. Archontas in mixing and casting of the specimens is deeply appreciated. The first author gratefully acknowledges the scholarship provided by the University of Cyprus during her last year of doctoral studies, which enabled the completion of the experiments presented.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 12 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 9, 2018
Accepted: Jun 5, 2018
Published online: Sep 22, 2018
Published in print: Dec 1, 2018
Discussion open until: Feb 22, 2019
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