Effect of Circumferentially Nonuniform Lateral Tension on Bond Behavior between Plain Round Bars and Concrete: Analytical Study
Publication: Journal of Structural Engineering
Volume 143, Issue 12
Abstract
The bond behavior between a plain bar and concrete has received more attention in recent years because of its importance in the assessment of historical structures. The negative effect of lateral tension on the bond performance of plain bars has been previously investigated through experiments, and the results have shown that the bond strength decreases with increases of lateral tension. However, few attempts have been made to analytically study the bond behavior of plain bars under circumferentially nonuniform lateral tension. Therefore, in this study, a theoretical investigation into the effect of circumferentially nonuniform lateral tension on the bond mechanism and ultimate bond strength of plain bars is undertaken. Based on the theory of elasticity, the compaction of the bar/concrete bond interface is first discussed, and then an analytical model is given for the ultimate bond strength of plain round bars under circumferentially nonuniform lateral tension. The proposed model is verified with experimental results from 96 pull-out specimens, which agree well with the test data. Furthermore, a parametric study is made to show that the proposed model can be applied without concern for separation of the bar/concrete interface for most historical RC structures except those located in humid or marine environments. Finally, the analytical results are compared with a design bond-strength code, which shows that the code could be used in calculating the development length of plain bars under lateral tension.
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Acknowledgments
Financial support from the National Key Research and Development Program of China under Grant No. 2016YFC0701106, the National Natural Science Foundation under Grant Nos. 51508069 and 51421064, the Fundamental Research Funds for the Central Universities under Grant No. DUT15RC(3)028, and the Scientific Research Fund of Liaoning Provincial Education Department under Grant No. L2015122 is greatly acknowledged.
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 143 • Issue 12 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Apr 24, 2016
Accepted: Jun 2, 2017
Published online: Oct 4, 2017
Published in print: Dec 1, 2017
Discussion open until: Mar 4, 2018
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