Behavior of Short and Deep Beams Made of Concrete-Filled Fiber-Reinforced Polymer Tubes
Publication: Journal of Composites for Construction
Volume 12, Issue 1
Abstract
Behavior of short and deep beams made of concrete-filled fiber-reinforced polymer (FRP) tubes (CFFT) was compared experimentally to that of their slender counterparts. Ten specimens made from four types of glass FRP tubes with different fiber architecture and lamina lay-up were tested with shear span to depth ratio between 0.9 and 6.25, diameter to thickness ratio between 16 and 63, and reinforcement index between 0.11 and 2.2. The study extended the test database of CFFTs to the lowest practical limit of shear span to depth ratio. None of the CFFT beams tested, even with the lowest shear span to depth ratio of 0.9, failed in shear. Tensile bending strains at the bottom of the midspan section of the beams always remained higher than the respective diagonal tensile strain at the midpoint of the shear span. Web shear cracks were observed only in the concrete core of deep CFFT beams with high reinforcement index. Following the first flexural crack, the concrete core began to slip relative to the FRP tube. This lack of composite action made shear less critical than flexure. Finally, short and deep CFFT beams exhibited higher bending capacity than their slender counterparts, primarily due to the direct diagonal compression strut that develops in the concrete core through arching action.
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Acknowledgments
Support for this study was provided by the National Science Foundation through Faculty Career Award to the third writer. Additional support was provided by the Florida Department of Transportation. The experiments were carried out at the Constructed Facility Laboratory of the North Carolina State University. Findings and opinions expressed here are however those of the writers alone, and not necessarily the views of the sponsoring agencies.
References
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© 2008 ASCE.
History
Received: Jul 17, 2006
Accepted: Sep 29, 2006
Published online: Feb 1, 2008
Published in print: Feb 2008
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