Experimental investigation of compressive strength of composite gfrp double skin tubular column

A glass fibre reinforced polymer (GFRP) concrete-steel double-skin tubular column (DSTC) consists of an outer GFRP tube and an inner steel tube, with the space in between filled with concrete. This paper focuses on the compressive strength of the glass fibre reinforced polymer and steel double skin tubular columns. Double skin tubular columns considered usually are of similar casing material on the inner as well as outer side of the column or both inner and outer tube of same shape, in this paper the never before variations taken are, the circular outer tube is glass fibre reinforced polymer tube with variations in its thickness and inner tube being of steel with variation in its shape As obtained from results, the optimum specimen is the one which has circular cross section on the periphery and as well on the inner side, the specimens with different cross sections demonstrated less compressive strength than the specimens with similar cross sections, but more compressive strength than the control section, thus these columns can be also an optimum replacement of conventional columns. Thickness of the GFRP tube also played an important role in determining the compressive strength of the specimens, the specimens which had more thickness showed enhanced results of compressive strength as compared to specimens which had lesser thickness.