Flexural Load Testing of Concrete-Filled FRP Tubes with Longitudinal Steel and FRP Rebar
Publication: Journal of Composites for Construction
Volume 10, Issue 2
Abstract
The flexural performance of reinforced concrete-filled glass-fiber reinforced polymer (GFRP) tubes (CFFTs) has been investigated using seven specimens, in diameter and long. Specimens were reinforced with either steel, GFRP, or carbon–fiber reinforced polymer (FRP) rebar of various sizes. Prefabricated GFRP tubes with most of the fibers oriented in the hoop direction were used in five specimens. One control specimen included conventional steel spirals of stiffness comparable to the GFRP tube and the other had no transverse reinforcement. Test results have shown that CFFT beams performed substantially better than beams with a steel spiral. Unlike CFFTs with FRP rebar, CFFTs with steel rebar failed in a sequential progressive manner, leading to considerable ductility. An analytical model capable of predicting the full response of reinforced CFFT beams, including the sequential progressive failure, has been developed, verified, and used in a parametric study. It is shown that laminate structure of the tube affects the behavior, only after yielding of the steel rebar. Steel reinforcement ratio significantly affects stiffness and strength, whereas concrete strength has an insignificant effect on the overall performance.
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Acknowledgments
The writers wish to acknowledge financial support provided by the ISIS Canada Network of Centres of Excellence, Lancaster Composite, Pultrall Inc., and Queen’s University.
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Information
Published In
Journal of Composites for Construction
Volume 10 • Issue 2 • April 2006
Pages: 161 - 171
Copyright
© 2006 ASCE.
History
Received: Apr 1, 2005
Accepted: Jul 18, 2005
Published online: Apr 1, 2006
Published in print: Apr 2006
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