Abstract
In this study, an experiment on compressive strength of the hybrid concrete-filled fiber-reinforced polymer (FRP) tube (CFFT) confined by filament winding was conducted to improve the longitudinal strength while considering the thickness of filament winding as a variable. A maximum error of 17% was observed when the results of performing the finite element analysis (FEA) by applying the mechanical properties of the fiber-reinforced polymer (FRP) materials suggested in previous studies were compared to those of the compressive strength experiment on the hybrid-CFFT. Moreover, a maximum error of 15% was exhibited when the results derived from the strength equation proposed by analyzing the compressive strength experiment were compared. Furthermore, the compressive strength of the hybrid-CFFT increased by up to 14% when the longitudinal compressive strength of the pre-tensioned spun high strength concrete (PHC) pile and concrete-filled tube (CFT) were compared.
Highlights
Sci. 2021, 11, 2900. https://doi.org/Structural steel and concrete are used as major construction materials owing to their excellent economic feasibility and durability
PHybrid-concrete-filled fiberreinforced polymer (FRP) tube (CFFT) is the maximum compressive load of the hybrid−CFFT, ACo is the cross-sectional area of the confined concrete, fp is the fracture stress of pultruded FRP (PFRP), and Ap frp is the cross-sectional area of PFRP
The compressive strength testing results of PFRP-filament winding FRP (FFRP) indicated that the compression performance improved as the thickness of FFRP increased
Summary
Structural steel and concrete are used as major construction materials owing to their excellent economic feasibility and durability. Extensive research is being conducted on concrete-filled FRP tubes (CFFTs) in which FRP is used as a material for confining concrete by expanding the CFT structure. In this regard, Nanni et al [8] and Toutanji [9] verified the increase in the strength of FRP by conducting experiments on the compression of CFFT. Picher et al [10] conducted an experiment on the compression of short concrete columns confined by CFRP sheets to predict the behavior of concrete under multi-axial loads and verified that the compressive strength varies when the thickness of the CFRP sheet and fiber orientation are adjusted. An experiment on the compressive strength of the hybrid−CFFT was conducted and, based on the thickness of FFRP, a strength equation was proposed by analyzing the experimental results
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