Effects of Loading Rate and Duration on Axial Behavior of Concrete Confined by Fiber-Reinforced Polymer Sheets
Publication: Journal of Composites for Construction
Volume 14, Issue 2
Abstract
In this study, 18 concrete cylinder specimens were tested either under uniaxial compression at different loading rates or exposed to sustained axial stresses after being jacketed externally with carbon-fiber-reinforced polymer (CFRP) sheets. The specimens were cast using medium strength concrete. All the specimens had identical dimensions and level of confinement. Loading rate and applied sustained stress level were the main test parameters. Applied loading rate varied between 0.0002 and 0.04 strain/min. Four stress levels between 0.52 and (0.90 and ) were used in short-term creep tests. Test results showed that the stress-strain behavior of CFRP confined concrete was influenced by the change in loading rate, and CFRP confinement provided considerable increase in the creep performance of concrete. The strength enhancement was more pronounced for specimens loaded at higher strain rates, while specimens loaded at slower strain rates exhibited better deformability. Results obtained from short-term monotonic loading tests were also compared with the results of two analytical approaches originally developed for plain concrete. None of the specimens failed during the short-term creep tests. However, the lifetime of the specimen, which was subjected to sustained axial stress, was predicted as 20 days. Results of residual strength tests showed that specimens did not have any strength loss due to sustained loading.
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Acknowledgments
The writers wish to thank the staff of Istanbul Technical University Construction Materials Laboratory, particularly, Professor Dr. Mehmet Ali Tasdemir, and Basf Turkey Company for their contributions during the preparations and tests of the specimens.
References
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© 2010 ASCE.
History
Received: Mar 5, 2009
Accepted: Jul 8, 2009
Published online: Mar 15, 2010
Published in print: Apr 2010
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