Behavior of Hybrid CRRP-Concrete-Steel Double Skin Tubular Column under Axial Load

Abstract

Hybrid double skin tubular members (DSTMs) arecomposite section of three material FRP tube outside,steel tube inside and concrete sandwiches in between. Thecurrent study investigated the behavior of fourteencircular DSTCs under axial load. Every specimen isaverage of a pair of samples, the key parameters are thelayers of outer carbon FRP tube, the compressive strengthof concrete and the types of columns include (DSTC) andconcrete filled FRP tube (CFFT). The test results showthat the concrete has effected constrained between twotubes, that’s leads to increases strength and ductility ofcolumn, the most effective parameters has the number oflayers of outer FRP tube the stress-strain relationshipshows high ductile behavior of under compression testand the CFFT is superior in ultimate load compared withDSTC.