Abstract
AbstractConcrete-filled fiber-reinforced polymer (FRP) tube (CFFT) systems have attracted much attention over the past several decades due to their superior features including ease and speed of construction, strength, ductility, and durability. This study aims at understanding the effect of tube damage on the axial behavior and strength of CFFTs. A test program was conducted on two types of tubes, namely, a near cross-ply and an angle-ply glass-FRP (GFRP) tubes. The damage was simulated as a vertical cut of different lengths throughout the full thickness of the tubes. A comparison with undamaged CFFTs and plain concrete specimens was included. The undamaged CFFTs had an axial strength double that of the plain concrete core because of the confinement effect and some axial load sharing of the tube. For damaged CFFTs, test results demonstrated a correlation between the reduced axial strength and length of cut. For example, vertical cut lengths equal to 9% and 19% of the perimeter resulted in 27% and 40% reductions in axial strength, respectively.
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