Abstract
This analytical study explores the utilization of CNTs as fiber reinforcements in GFRP tube confined concrete columns using finite element analysis software ANSYS. The CNT- reinforced concrete columns were confined with GFRP tubes of fiber orientation ±85°. The tube thicknesses chosen were 3 mm and 4 mm with the slenderness ratios of CFFTs being 2,4,6,8,12,16 along CNT reinforcement of 1%, 2%, and 3%. Three grades of concrete 40 MPa (Normal Strength Concrete), 60 MPa (High Strength Concrete), and 120 MPa (Ultra High Strength Concrete) had been chosen. About 144 GFRP tube confined CNT reinforced Concrete columns were simulated using ANSYS software covering NSC, HSC and UHSC and their stress strain behavior, failure modes, effect of confinement, slenderness ratio, thickness of GFRP tubes and the fiber volume fraction of CNTs had been investigated and reported. The slenderness ratio 6 was optimal for CNT reinforced concrete columns confined with GFRP tubes. The strength enhancement of CNT reinforced UHSC was about 2.6 times of CNT reinforced HSC. The passive confinement provided by the FRP jacket loses its effectiveness on increasing the grade of concrete particularly the Ultra High Strength Concrete. This led to brittle failure. However the axial strength enhancement reached a peak when compared with other grades of concrete.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
