Compression behaviour of hybrid steel-FRP sleeved column system

Abstract

Sleeved Column (SC) System, a novel compression member that consists of an inner core made of steel rods surrounded by a steel sleeve provides an improved resistance to buckling load and enhances the compression resistance almost equal to Euler’s buckling load. The load carrying capacity of sleeved column system is significantly affected by the stiffness of core. SC system usually consists of single or group of steel rods in the core to resist the given axial force. This study presents a SC system with combination of High Tensile Steel (HTS) and Glass Fibre Reinforced Polymer (GFRP) rods in the core called as “Hybrid Steel-FRP Sleeved Column” (HSFSC) System. The gap between sleeve and the core is grouted with geopolymer mortar. The conventional SC specimen consists of HTS rods in the core surrounded by a thin walled steel sleeve. The HSFSC specimen consists of various combinations of HTS and GFRP rods in the core surrounded by mild steel/GFRP sleeve. The performance of HSFSC system against the conventional SC system under axial compression load is studied by conducting experiments.