Abstract
The available code provisions for seismic design of confinement reinforcement in fiber-reinforced polymer-reinforced concrete (FRP-RC) columns, even their most recent versions, are overly conservative. This is due to the limited available research data, particularly those related to high-strength concrete (HSC) columns and those with different aspect ratios. That is, the linear-elastic behavior of FRP could be of concern when combined with the brittle nature of HSC or implemented in shorter columns, which could be significantly influenced by shear stresses. Therefore, this study was conducted to investigate the effects of concrete compressive strength and column aspect ratio on the seismic performance of glass FRP (GFRP)-RC circular columns with variation of spiral pitch and axial load level. Nine full-scale GFRP-RC column-footing connections were cast and tested under concurrent axial loading and reversed-cyclic lateral drifts. Test results proved the conservativeness of the seismic design requirements of the Canadian standards for confinement reinforcement in GFRP-RC circular columns with regard to the effects of HSC and different aspect ratios.
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