Performance of Carbon-Fiber-Reinforced Polymer Stirrups in Prestressed-Decked Bulb T-Beams
Publication: Journal of Composites for Construction
Volume 19, Issue 3
Abstract
Eleven decked bulb T beams were constructed, instrumented, and tested under shear loading to failure. Nine beams were reinforced and prestressed with carbon-fiber composite cable (CFCC) strands, whereas one beam was prestressed with conventional low-relaxation steel strands and one beam was reinforced with non-prestressed CFCC strands. Half the span of each beam was reinforced with CFCC stirrups, whereas the other half was reinforced with conventional steel stirrups. Both ends of each beam were tested to evaluate the performance of CFCC stirrups versus that of steel stirrups. The investigation addressed the shear performance with respect to several shear parameters, including shear-span-to-depth ratio, stirrup spacing, prestressing force, and type of longitudinal and transverse reinforcement. All test beams failed by crushing of concrete in either the web or the top flange. No rupture of CFCC stirrups was experienced in any of the test beams. The performance of CFCC stirrups was analogous to that of steel stirrups with the exception that steel stirrups demonstrated a yield plateau before concrete failure. Beam ends with CFCC stirrups attained cracking and ultimate shear capacities similar to those attained in ends with steel stirrups. Results from the experimental investigation were compared with the theoretical values predicted using some available shear design guidelines for steel and CFCC reinforcement. In addition, modifications for current AASHTO LRFD shear design equations and its possible implementation in the ACI shear design guidelines are proposed based on the experimental results.
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Acknowledgments
This investigation was sponsored through a consortium of the National Science Foundation (Award No. CMMI-0969676), Federal Highway Administration Transportation Pool-Fund (Michigan-DOT, Iowa-DOT, Wisconsin-DOT, Oregon-DOT, and Minnesota-DOT) (Contract No. TPF-5/254), Tokyo Rope MFG. Co. LTD, Japan, and Michigan Department of Transportation (Center of Excellence No. 0436/2). The authors gratefully acknowledge their support.
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Published In
Journal of Composites for Construction
Volume 19 • Issue 3 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 8, 2014
Accepted: Jul 25, 2014
Published online: Sep 4, 2014
Discussion open until: Feb 4, 2015
Published in print: Jun 1, 2015
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