Damage Threshold of Near-Cross-Ply Tubes Used in Concrete-Filled FRP Tubes Loaded in Flexure
Publication: Journal of Composites for Construction
Volume 24, Issue 2
Abstract
Concrete-filled fiber-reinforced polymer (FRP) tubes (CFFTs) have been studied extensively, but a lingering question remains regarding the vulnerability of the exposed tube to accidental damage or vandalism. In this paper, the effect of damage induced in the tubes on the flexural strength of CFFTs is studied. A total of 18 specimens with tubes having nearly orthogonal fiber arrangements were tested in four-point bending, including one undamaged control specimen to establish its full nominal strength (). A total of 11 specimens with artificially induced damage in the form of through-thickness cuts on the tension side, and six with cuts on the compression side at midspan were also tested. Longitudinal, circumferential, and square cuts were introduced. Cut length and proximity to neutral axis were varied. It is shown that the most critical cut is the circumferential one on extreme tension. A sharp decline occurred initially in the nominal residual strength ratio (), from 1.0 to 0.55 at a cut length-to-perimeter ratio of , followed by a much less steep trend up to of 0.25 at a cut. As the location of a circumferential cut shifted from extreme tension to an 80° from the bottom, increased from 0.52 to 1.0. A longitudinal cut of on the tension side resulted in of 0.69 as opposed to 0.38 for the circumferential cut. Compression side longitudinal and circumferential cuts were less critical with of 0.8 to 0.9. For practical design, a case study based on ultimate static strength showed that the CFFT can tolerate a circumferential tension cut of up to before it has to be taken out of service.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request. These include data used to generate plots.
Acknowledgments
The authors wish to acknowledge the financial support provided by Natural Sciences and Engineering Research Council of Canada (NSERC). The authors are also grateful to the fellow graduate students and technical support staff at Queen’s University who assessed in this project.
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©2019 American Society of Civil Engineers.
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Received: Nov 13, 2018
Accepted: Jun 4, 2019
Published online: Dec 20, 2019
Published in print: Apr 1, 2020
Discussion open until: May 20, 2020
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