Abstract
FRP-confined concrete/UHPC (ultra-high-performance concrete) core-encased rebar (FCCC-R) is a recently developed novel structural component for FRP-concrete composite structures. FCCC-R utilization can improve both the strength and ductility of composite structural members under both axial compression and combined bending-compression loading. When implemented in vertical structural members such as columns and shear walls with a low shear-span ratio, FCCC-Rs are subjected to combined axial compression and shear. In this study, the shear behaviour of FCCC-Rs is experimentally investigated. A total of 28 FCCC-R specimens are tested. The failure mechanism and modes, the load–deflection curves and the ultimate strength were obtained from the experiments. The FCCC-Rs exhibited higher load capacity and deformability. It could be concluded that the combination of the FRP tube, concrete and rebar can achieve the effect of “1+1+1>3”. Furthermore, the influence of the shear-span ratio, concrete strength, tube thickness and fibre orientation are examined. Finally, design equations for the shear strength of FCCC-Rs are proposed, which attain a good agreement with the test data.
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