Confinement Model for FRP-Confined High-Strength Concrete

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Hoop strains in FRP-confined concrete columns: experimental observations (2015, methodology): “Research has shown that the ultimate material tensile strain of fibers is unachievable in the in situ form of an FRP jacket, and the lower observed efficiency has led to the development of a range of strain reduction factors to establish the actual hoop rupture strain of the FRP jacket [6–9].”
Axial compressive behavior of FRP-confined concrete: Experimental test database and a new design-oriented model (2013, background): “[41], the key parameters that influence the strain reduction factor were indentified.”
Behavior of steel fiber-reinforced high-strength concrete-filled FRP tube columns under axial compression (2015, methodology): “Previous research has established that sufficiently confined concrete exhibits a monotonically ascending curve, which consists of a parabolic first ascending portion and a nearly linear second branch [3,29,32,63].”