Unified Stress Strain Model for FRP and Actively Confined Normal Strength and High Strength Concrete
AbstractAccurate modeling of the complete stress strain relationship of confined and unconfined concrete is of vital importance in predicting the overall flexural behavior of reinforced concrete structures. The analysis oriented models, which utilize the dilation characteristics of confined concretes for stress strain relationship prediction, are well recognized for their versatility in such modeling applications. These models assume that at a given lateral strain, the axial compressive stress and strain of fiber reinforced polymer (FRP) confined concrete are the same as those of the same concrete when it is actively confined under a confining pressure equal to that supplied by the FRP jacket. However, this assumption has recently been demonstrated experimentally to be inaccurate for high strength concrete (HSC) It was shown that at a given axial strain, lateral strains of actively confined and FRP confined concretes of the same concrete strength correspond when they are subjected to the same lateral con.