Fatigue of Reinforced Concrete Beams Strengthened with Steel-Reinforced Inorganic Polymers
Publication: Journal of Composites for Construction
Volume 13, Issue 2
Abstract
Steel-reinforced polymer (SRP) composite materials are very attractive due to their low weight and high strength. The ease of installation which significantly reduces repair time and expense is another major advantage. One of the main disadvantages of SRP materials is that the matrices used for their fabrication are typically organic and thus they are susceptible to fire. In this study, a newly developed retrofit system is being used. It consists of high strength steel fibers impregnated in a fireproof inorganic matrix. The objective of this study is to examine the effects of this hybrid rehabilitation system on the fatigue performance of strengthened reinforced concrete beams. Sixteen reinforced concrete beams with enough transverse reinforcement to avoid shear failure were used in this study. Nine beams were strengthened with steel fiber sheets on their tension faces. The results from the present study indicate that the fatigue life of reinforced concrete beams, subjected to the same cycling load, can be significantly extended using externally bonded sheets. A rather important finding is that although the strengthening system increases the fatigue life of the beams, the failure mechanism remains the same in both strengthened and nonstrengthened beams. Thus, it is possible to predict the fatigue life of a cyclically loaded beam using existing fatigue models. Furthermore, no delamination failures were observed due to fatigue loading.
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Information
Published In
Journal of Composites for Construction
Volume 13 • Issue 2 • April 2009
Pages: 103 - 112
Copyright
© 2009 ASCE.
History
Received: Mar 18, 2008
Accepted: Oct 15, 2008
Published online: Apr 1, 2009
Published in print: Apr 2009
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