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
DOI:
10.14359/51686782
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.