Testing and Modeling of a New Moment Connection of Concrete-Filled FRP Tubes to Footings under Monotonic and Cyclic Loadings
Publication: Journal of Composites for Construction
Volume 15, Issue 4
Abstract
This study explores a new moment connection of concrete-filled fiber-reinforced polymer (FRP) tube (CFFT) to concrete footing. The tube is tightly fitted and adhesively bonded to a short reinforced concrete stub protruding from the footing, which facilitates concrete filling of the tube without the need for shoring. To establish the critical stub length (), specimens with heavily steel-reinforced stubs varying in length from to , where = diameter of the CFFT, were fabricated and tested in flexure by using a cantilever setup. The required to achieve flexural failure of the CFFT was . Additional specimens with a sufficient stub length of were then fabricated to examine the effect on strength and ductility of the steel reinforcement ratio () in the stub. The optimal of the stub required for the CFFT to reach flexural failure was 3.2%. Finally, the effect of low-cycle reversed bending fatigue was studied with and without an axial compression load. Remarkable ductility associated with the formation of a plastic hinge was observed at of 2%. An analytical model capable of predicting (1) moment capacity of the connection, (2) whether failure is governed by flexure or bond, and (3) was developed and validated. It was then used in a parametric study to explore the effects of CFFT mechanical and geometric properties on .
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Acknowledgments
The authors wish to acknowledge the Natural Sciences Engineering Research Council of Canada (NSERC), the Canada Research Chairs program, the Early Researcher’s Award Program and MRI Postdoctoral Fellowship of the Ontario Government, and Queen’s University for the Chancellor’s Research Award. The authors are also grateful to Paul Thrasher and David Tryon from Queen’s University.
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© 2011 American Society of Civil Engineers.
History
Received: Aug 22, 2010
Accepted: Dec 14, 2010
Published online: Dec 16, 2010
Published in print: Aug 1, 2011
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