Design of Glass Fiber-Reinforced Polymer-Reinforced Concrete Columns per ACI CODE-440.11-22
Zahid Hussain and Antonio Nanni
Appears on pages(s):
building code; concrete columns; eccentricity; glass fiber-reinforced polymer (GFRP) reinforcement
This paper is an attempt at a better understanding of design
provisions of ACI CODE-440.11-22, building code for the design
of glass fiber-reinforced polymer (GFRP)-reinforced concrete
(RC) columns. Sway and a non-sway column examples originally designed with steel reinforcement were redesigned using GFRP longitudinal bars and ties as per provisions of ACI CODE-440.11-22 to analyze the effect of changing reinforcement type. Columns were designed with both low-modulus (Ef = 6500 ksi), and high-modulus (Ef = 8700 ksi) GFRP bars. A parametric study was carried out by varying the concrete compressive strength, the cross-section aspect ratio, and the resultant load eccentricity. GFRP-RC columns require larger cross-section dimensions and more reinforcement area than steel-RC columns irrespective of the GFRP elastic modulus when subjected to the same demand. The concrete strength has a significant effect on the dimensions of GFRP-RC columns, and rectangular sections were found to be more efficient than square sections with the same gross concrete area in the presence of moment. GFRP-RC columns subject to high eccentricity loads take advantage of GFRP tensile properties and, thus, are more efficient.