Abstract
This paper studies experimentally the structural behavior of channel steel reinforced concrete-filled glass fiber-reinforced polymer (GFRP) tubular stub columns. To understand their structural performance, we examined 27 specimens which subjected to axial compression. The variables of the specimen are concrete strength grade, diameter-to-thickness ratio of GFRP tube and steel ratio. The displacement-load curve, strain-load curve, ultimate load, axial compressive stiffness and failure characteristics of the specimens were analyzed. The results of the test show that the specimens’ ultimate bearing capacity increases as the concrete strength increases. And those specimens with higher concrete strength grade have greater initial stiffness and better deformation capacity than those with lower concrete strength grade. The varieties of the steel ratio have no significant effect on the specimens’ axial deformation property. The confinement coefficient is proposed to evaluate the constraint effect of the GFRP tube on both the inner channel steel and the core concrete. There was a negative correlation between the restraint effect and the diameter-thickness ratio of the GFRP tube. A simplified formula for calculating the axial bearing capacity of the composite columns is proposed.
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