Behavior of Reinforced Concrete Beams with Loss of Bond at Longitudinal Reinforcement
Publication: Journal of Structural Engineering
Volume 129, Issue 10
Abstract
The effect of loss of bond for longitudinal reinforcement on the structural behavior of RC beams is investigated in a test series of six beams where nominal length without bond is varied. Loss of bond is created with plastic tubes surrounding the longitudinal reinforcement leaving short bonded lengths over support and at positions where stirrups are crossing the longitudinal reinforcement. Using a bond-stress slip relationship made it possible to see that the total bond force could be calculated as the sum of local bond forces. Maximum bond force occurs at maximum load and when the available bond force decreases the load carrying capacity is also reduced. Even for significant loss of bond, the reduction in shear capacity was moderate, implying that short bond lengths are sufficient to create high bond forces. Local areas with bond contributes efficiently to create anchorage for the longitudinal bars. It was also found that the loss of bond was compensated by increased utilization of stirrups, and that loss of bond does not lead to more brittle types of failure.
Get full access to this article
View all available purchase options and get full access to this article.
References
Austrell, P.-E., et al. (1996). “Contact free strain measurment using Matlab Image Processing Toolbox.” Rep. TVSM-7107, Lund Univ., Lund Institute of Technology, Division of Structural Mechanics, Lund, Sweden.
Bickley, J. A., and Liscio, R. (1997). “Monitoring parking structure repair.” Concr. Int., 34–40.
Boverket. (1995). “Boverkets handbok om betongkonstruktioner, Band 1 Konstruktion, upplaga 2.” BBK 94 Swedish concrete design manual, 2nd Ed., Boverket, Service of Publications, SE-371 23 Karlskrona, Sweden.
CEB/FIP. (1999). Structural concrete, textbook on behaviour, design and performance. Updated knowledge of the CEB/FIP model code 1990. Vol. 1—Introduction—design process—Materials, Lausanne, Switzerland.
Collins, M. P., and Kuchma, D. A.(1998). “Advances in understanding shear performance of concrete structures.” Prog. Struct. Eng. Mater.,1(4), 360–369.
Jeppsson, J.(2000). “Contact free monitoring of cracked concrete.”Struct. Concr.,1(3), 133–141.
Kim, W., and White, R. N.(1999). “Shear critical cracking in slender reinforced concrete beams.” ACI Struct. J., 96(5), 757.
Magnusson, J. (1997). “Bond and anchorage of deformed bars in high-strength concrete.” Publication 97:1, Division of Concrete Structures, Dept. of Structural Engineering, Chalmers Univ. of Technology, Göteborg., Sweden.
Magnusson, J. (2000). “Bond and anchorage of ribbed bars in high-strength concrete.” Division of Concrete Structures, Dept. of Structural Engineering, Chalmers Univ. of Technology, Göteborg, Sweden.
Mallet, G. P. (1994). “State-of-the-art review repair of concrete bridges.” Thomas Telford Services Ltd, London.
Mangat, P. S., and Elgarf, M. S.(1999). “Flexural strength of concrete beams with corroding reinforcement.” ACI Struct. J., 96, 149–158.
Rodriguez, J., Ortega. L. M., and Casal, J. (1995). “Relation between corrosion and load bearing capacity of concrete beams.” Brite/Euram Project No. BREU-CT92-0591, Residual Service Life of Reinforced Concrete Structures, Deliverable on task 3.3, European Union, Research and Innovation.
Smith, P. (1998). “The view from the parapet.” Design and engineering, Second Quarter, 3.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 129 • Issue 10 • October 2003
Pages: 1376 - 1383
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Sep 26, 2000
Accepted: Dec 23, 2002
Published online: Sep 15, 2003
Published in print: Oct 2003
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.