Design-oriented models for concrete columns confined by steel-reinforced grout jackets

This paper investigates the axial stress–strain response of concrete confined with Steel-Reinforced Grout (SRG) jackets comprising of Ultra-High Tensile Strength Steel textiles embedded in an inorganic binder. Brittle, semi-ductile and ductile stress–strain response curves are identified according to the level of confinement stiffness provided by the SRG jackets. A comprehensive experimental database of κ0 SRG-confined columns is developed and used to assess the influence of key design parameters. The results are then used to propose new design oriented models to predict the strength and ultimate strain of SRG confined concrete columns by taking into account the confinement stiffness of the jackets.