Abstract
The behavior of concrete-filled fiber tubes (CFFT) polymers under axial compressive loading was investigated. Unlike the traditional fiber reinforced polymers (FRP) such as carbon, glass, aramid, etc., the FRP tubes in this study were designed using large rupture strains FRP which are made of recycled materials such as plastic bottles; hence, large rupture strain (LRS) FRP composites are environmentally friendly and can be used in the context of green construction. This study performed finite element (FE) analysis using LS-DYNA software to conduct an extensive parametric study on CFFT. The effects of the FRP confinement ratio, the unconfined concrete compressive strength ( ), column size, and column aspect ratio on the behavior of the CFFT under axial compressive loading were investigated during this study. A comparison between the behavior of the CFFTs with LRS-FRP and those with traditional FRP (carbon and glass) with a high range of confinement ratios was conducted as well. A new hybrid FRP system combined with traditional and LRS-FRP is proposed. Generally, the CFFTs with LRS-FRP showed remarkable behavior under axial loading in strength and ultimate strain. Equations to estimate the concrete dilation parameter and dilation angle of the CFFTs with LRS-FRP tubes and hybrid FRP tubes are suggested.
Highlights
Composites are much cheaper than the traditional fiber reinforced polymers (FRP). These new FRP composites are made of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) fibers
Several researchers investigated the behavior of concrete-filled fiber tubes (CFFT) columns using the traditional FRP tubes under different loadings [3,4,5,6,7,8,9,10]
Where E1 is the confinement modulus ratio, Ef1 is the elastic modulus of the traditional FRP, Ef2 is the tangent modulus of the large rupture strain (LRS)-FRP, tf is the thickness of the FRP, D is the column’s diameter, and fc′ is the characteristic cylindrical concrete strength at 28 days
Summary
New fiber reinforced polymer (FRP) composites have been manufactured from recycled plastic bottles They were introduced as alternatives to traditional FRPs such as glass, aramid, and carbon FRP. Several researchers investigated the behavior of CFFT columns using the traditional FRP tubes under different loadings [3,4,5,6,7,8,9,10]. Previous studies used the dilation angle to vary with the FRP jacketing stiffness and to be a constant value under varied axial load levels in the finite element analysis [18,19,20]. A new equation to estimate the dilation angle for the CFFT column with LRS-FRP tubes is suggested
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