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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Flexural Strengthening of RC Beams Using Steel Reinforced Polymer (SRP) Composites
Author(s): Y.J. Kim, A. Fam, A. Kong, and R. El-Hacha
Publication: Special Publication
Appears on pages(s): 1647-1664
Keywords: concrete beam; flexure; Hardwire®; sheet; steel-reinforcedpolymer; strengthening
Abstract:This paper presents the application of a new generation of externallybonded composite material in flexural strengthening of reinforced concrete beams. Thesteel reinforced polymer (SRP) composite consists of high-carbon steel unidirectionalHardwire® fabrics embedded in epoxy resin, and offers high strength and stiffnesscharacteristics at a reasonable cost. In this paper, the mechanical properties of SRP areevaluated and its application in flexural strengthening of RC beams is investigated. Sixbeams have been tested in three-point bending to study the effect of SRP retrofitting onflexural behavior, failure modes, and crack patterns. Test parameters include variationof the width of SRP sheets and the use of SRP U-wraps to prevent premature failurecaused by delamination of the longitudinal sheet. Significant increase in flexuralcapacity, up to 53%, and pseudo-ductile failure modes were observed in SRP-strengthened beams. Failure was governed primarily by concrete cover delamination atthe ends of SRP sheets or concrete crushing. The U-wraps improved flexural stiffness bymeans of controlling diagonal cracking and providing anchorages to the longitudinalSRP sheets, which reduced their slip. Shear stress concentrations near cut-off points ofSRP sheets have also been investigated. An analytical model was used to predict thenominal flexural strength of SRP-strengthened beams.
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