2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference
Dr. Shamim Sheikh, University of Toronto (Presenter)
To address the issue of corrosion of steel in concrete structures, GFRP is slowly gaining acceptability as a replacement of steel. In an effort to evaluate the feasibility of GFRP bars and spirals as internal reinforcement in columns, an extensive research program is underway at the University of Toronto. A total of seventeen 356 mm diameter concrete columns have been tested under simulated earthquake forces which included constant axial load and cyclic lateral displacement excursions. All columns were reinforced laterally with GFRP spirals. Nine columns contained longitudinal GFRP bars while eight had longitudinal steel bars. Results from a select group of specimens will be presented in this paper in the form of moment vs. curvature response and shear vs. deflection behaviour. A number of ductility parameters related to curvature, displacement, and energy dissipation are used to evaluate the performance of specimens. Columns containing longitudinal and lateral GFRP reinforcement demonstrated a stable post elastic response accompanying large deformability. Columns reinforced with longitudinal steel and GFRP spirals also displayed excellent behaviour with higher stiffness and larger shear and moment capacities mainly due to the linear elastic behaviour of GFRP bars until rupture at a strain of approximate 0.02.