Moment-Shear Interaction Mechanism for Carbon Fiber- Reinforced Polymer-Strengthened Reinforced Concrete Beams in Flexure

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Title: Moment-Shear Interaction Mechanism for Carbon Fiber- Reinforced Polymer-Strengthened Reinforced Concrete Beams in Flexure

Author(s): Yail J. Kim

Publication: Structural Journal

Volume: 111

Issue: 4

Appears on pages(s): 967-976

Keywords: fiber-reinforced polymer (FRP); modeling; moment-shear interaction; strengthening

Date: 7/1/2014

Abstract:
This paper presents an analytical model to study the moment-shear interaction of reinforced concrete beams strengthened in flexure using externally bonded (EB) or near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) composites. Emphasis of the model is placed on understanding the shear-resisting mechanism of CFRP-strengthened beams, which is not well-documented in the research community when compared with flexural models. The contribution of CFRP is explained based on the beam and arch action components of a strengthened beam. A large compilation of experimental data consisting of 123 beams is used to assess the developed theory and to propose the response criteria of CFRP-strengthened beams subjected to moment-shear interaction. Existing models are evaluated, including the applicability of the ACI 318-11 and ACI 440.2R-08 shear resistance expression Vc for strengthened beams.