Effects of Transverse Steel on the Axial-Compression Strength of FRP-Confined Reinforced Concrete Columns Based on a Numerical Parametric Study

Reinforced concrete (RC) columns can be effectively rehabilitated or strengthened by externally bonded fiber-reinforced polymer (FRP) wraps, which improve the axial load capacity and ductility of these through a confinement effect. Modern design codes require that seismically designed RC have significant minimum amounts both longitudinal transverse steel. This steel apply considerable confining pressure into core in addition to produced external FRP sheets. simultaneous accurately modeled using recently developed FRP-and-steel confined model for finite-element analysis. paper presents comprehensive parametric study investigate effects relative importance key modeling parameters on strength FRP-confined columns. The results show effect significantly increase columns, particularly large cross sections, low compressive strengths, FRP. induce two distinct behaviors depending ratio between lateral unconfined peak strength. These described as functions coefficient. this used achieve more efficient economical retrofit confinement.