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Title: P-M Interaction of Geopolymer FRC Slender Columns Reinforced with Steel, GFRP, or Hybrid Double-Layer

Author(s): Mohammad AlHamaydeh and Fouad Amin

Publication: Structural Journal



Appears on pages(s):

Keywords: fiber-reinforced concrete (FRC); geopolymer concrete (GPC); glass fiber-reinforced polymer (GFRP) reinforcing bar; hybrid reinforcement; interaction diagrams; slender columns; slenderness ratio

DOI: 10.14359/51740570

Date: 2/14/2024

A numerical integration model is developed to investigate the axial load-bending moment interactions of fiber-reinforced geopolymer concrete (FRGPC) columns reinforced with double layers of steel, glass fiber reinforced polymer (GFRP), or hybrid reinforcement. The model accounts for material and geometric nonlinearities, including the slenderness-induced second-order effects through an iterative layer-by-layer integration scheme of the critical section. Analytical investigations were conducted for various double-layer reinforcement configurations of steel, GFRP, and hybrid. The effect of adding steel/synthetic macro fibers to the concrete matrix was also investigated. Moreover, comprehensive deterministic sensitivity analyses were conducted to assess the influence of the concrete compressive strength (fco), reinforcement fiber dosage, and the longitudinal/transverse reinforcement ratios on different response values. For the axial load capacity of GFRP-reinforced columns, the longitudinal reinforcement ratio was found to be the most influential parameter, while for the steel/hybrid reinforced columns, fco, was the most influential parameter. Moreover, for all the simulated configurations, confinement efficiency was most sensitive to fco out of all the investigated parameters. The longitudinal reinforcement ratio most influenced bending moment capacity and the associated secant stiffness. Lastly, axial load-bending moment interactions were developed for various reinforcement configurations. The interactions included the effects of the slenderness ratio, the macro fiber type, longitudinal/transverse reinforcement type/strength, and the longitudinal reinforcement ratio. The GFRP-reinforced columns showed more sensitivity to slenderness effects than steel-reinforced columns.