Behavior of Concrete Beams Strengthened with Fiber-Reinforced Polymer Laminates under Impact Loading
Publication: Journal of Composites for Construction
Volume 7, Issue 3
Abstract
Most of the research on application of composite materials in civil engineering during the past decade has concentrated on the behavior of structural elements under static loads. In engineering practice, there are many situations in which structures undergo impact or dynamic loading. In particular, the impact response of concrete beams strengthened with composite materials is of interest. This paper presents the results of an experimental investigation conducted to study the impact effects on concrete beams strengthened with fiber-reinforced polymer laminates. Two types of composite laminates, carbon and Kevlar, were bonded to the top and bottom faces of concrete beams with epoxy. Five beams were tested: two strengthened with Kevlar laminates, two strengthened with carbon laminates, and one unretrofitted beam as the control specimen. The impact load was applied by dropping a steel cylinder from a specified height onto the top face of the beam. The test results revealed that composite laminates significantly increased the capacity of the concrete beams to resist impact load. In addition, the laminates reduced the deflection and crack width. Comparing the test results of the beams strengthened with Kevlar and carbon laminates indicated that the gain in strength depends on the type, thickness, weight, and material properties of the composite laminate.
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References
Abrate, S. (1998). Impact on composite structures, Cambridge University Press, Cambridge, U.K.
American Concrete Institute (ACI) Committee 439. (1969). “Effect of steel strength and reinforcement ratio on the model of failure and strain energy capacity of reinforced concrete beams.” J. ACI, 66(3), 165–173.
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Copyright © 2003 American Society of Civil Engineers.
History
Received: Jun 29, 2001
Accepted: Jul 3, 2002
Published online: Jul 15, 2003
Published in print: Aug 2003
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