Effect of Steel Fibers on Bond Performance of Steel Bars in NSC and HSC under Load Reversals
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 10
Abstract
This study concentrates on experimental evaluation of the effect of fiber reinforcement on the bond response of steel bars under load reversals. Beam specimens with symmetrical spliced top and bottom steel bars were used in the investigation. The specimens were designed to experience splitting mode of bond failure. The test variables included the diameter of the spliced reinforcement or the ratio of concrete cover to bar diameter , the concrete compressive strength: normal-strength concrete (NSC) and high-strength concrete (HSC), and the volume fraction of steel fibers. Without fiber reinforcement, the control specimens experienced very sudden and quick bond deterioration leading to a total loss of load resistance in the first cycle following bond splitting. The presence of steel fibers increased the peak bond strength, reduced the bond degradation or damage under cyclic loading, and resulted in substantially enhanced energy absorption and dissipation capacities. The level of improvement in cyclic performance increased with increase in . Also, the increases in average bond strength at bond failure due to fibers were higher for the HSC when compared to the NSC specimens. Design equations in which the bond strength is expressed as a function of were more accurate in predicting the test data for the plain unconfined specimens in comparison with . Available expressions for predicting the bond strength of developed/spliced bars in fiber-reinforced concrete showed good agreement with the test results.
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Acknowledgments
This research was supported by the Lebanese National Council for Scientific Research (LNCSR). The writer is most grateful for this support and to the Faculty of Engineering and Architecture at the American University of Beirut (AUB) for providing the laboratory facilities.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 10 • October 2007
Pages: 864 - 873
Copyright
© 2007 ASCE.
History
Received: Dec 21, 2005
Accepted: Apr 14, 2006
Published online: Oct 1, 2007
Published in print: Oct 2007
Notes
Note. Associate Editor: Nemkumar Banthia
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