ABSTRACT
In this paper, 12 Glass FRP (GFRP)-confined UHSC short columns with silica fume were tested under axial compression. Investigated variables
1 INTRODUCTION
Retrofitting of concrete columns using Fibre-Reinforced Polymer (FRP) jackets with fibres predominately oriented in the hoop direction has become popular within the structural engineering community. FRP-confinement could increase both the compressive strength and ultimate strain of concrete columns (Jiang and Teng 2007; Lim and Ozbakkaloglu 2013). While, many studies have been conducted on the behaviour of FRP-confined Normal Strength Concrete (NSC) (i.e. compressive strength less than 50 MPa) columns, only few studies have been conducted on studying the behaviour of FRP-confined High-Strength Concrete (HSC) (i.e. compressive strength over 50 MPa) columns, and even fewer studies on FRP-confined UltraHigh Strength Concrete (UHSC) (i.e. compressive strength 80 MPa) columns. It is widely accepted that HSC structural members generally behaves differently to those of NSC (e.g. HSC demonstrate more brittle failure process). Nevertheless, Xiao et al. (2010) showed that the axial stress-strain model of Jiang and Teng (2007) initially developed for NSC, is also accurate for FRP-confined HSC. However, comparisons were made only on limited experimental data, and the applicability of the model on a wider test database was not confirmed. Lim and Ozbakkaloglu (2013) proposed
include unconfined concrete strength and the number of GFRP layers.
