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Title: Strut-and-Tie Model for Shear Friction of Concrete with Fiber-Reinforced Polymer Composites

Author(s): Nicolas Saenz, Chris P. Pantelides, and Lawrence D. Reaveley

Publication: Structural Journal

Volume: 101

Issue: 6

Appears on pages(s): 863-871

Keywords: concrete; polymer; shear strength; strut-and-tie

DOI: 10.14359/13462

Date: 11/1/2004

Abstract:
Analytical models are developed from tests of shear transfer units strengthened externally with carbon fiber-reinforced polymer (CFRP) composite strips. The analytical models are based on superposition of the two components of shear friction strength: that due to concrete and that due to concrete-CFRP interaction. The simplified model, based on experimental observations, was used to separate the shear friction contribution of concrete and that of concrete-CFRP interaction. The strut-and-tie model depends on the effective CFRP tensile strain, which is a function of the normalized CFRP stiffness. The strut-and-tie model can capture the shear friction contribution due to the tensioning effect of the CFRP strip. This is a novel application of the strut-and-tie model in externally applied CFRP composites for concrete under shear friction, and it is successful in representing the experimental behavior with good accuracy.