Monotonic Behavior of Reinforced Concrete Columns Confined with High-Performance Ferrocement
Publication: Journal of Structural Engineering
Volume 139, Issue 4
Abstract
In this study, a method of strengthening circular columns using high-performance ferrocement (HPF) is proposed. This is achieved by replacing the concrete cover by HPF (i.e., comprising rendering material and wire mesh). Direct tensile tests were carried out on HPF specimens. For rendering material with high tensile strength, it is necessary to incorporate its tensile strength in the estimation of the tensile strength of HPF. Nineteen full-scale circular plain or RC columns were tested under monotonic compression. Eleven were detailed with a volumetric ratio of transverse reinforcement at 0.230%. HPF, having three different rendering materials and with one or three layers of wire mesh, was used to confine eight of these columns. Test variables included volume fraction of wire mesh and tensile strength of rendering material. Plain-concrete columns strengthened with HPF have peak strengths at 30–59% higher than control specimens. RC columns having a low at 0.230% and strengthened with HPF can achieve peak strengths comparable with columns having a high at 0.918%. A set of empirical equations for predicting the peak strength of plain-concrete or RC columns strengthened with HPF is derived, showing good agreement with the test data. Lastly, a design procedure for strengthening a RC column by replacing the concrete cover using HPF is proposed.
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Acknowledgments
The authors are grateful to the financial support from the Hong Kong Polytechnic University and the Research Grants Council of Hong Kong (RGC No. PolyU 5206/08E). The authors thank the Heavy Structure Laboratory of the Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, for conducting the experiments.
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 139 • Issue 4 • April 2013
Pages: 574 - 583
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Sep 25, 2011
Accepted: Jul 24, 2012
Published online: Mar 15, 2013
Published in print: Apr 1, 2013
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