Structural Performance of Steel-Tube Concrete Columns Confined with CFRPs: Numerical and Theoretical Study
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RESEARCH PAPER
Structural Performance of Steel‑Tube Concrete Columns Confined with CFRPs: Numerical and Theoretical Study Ali Raza1 · Babar Ali2 · Anees ur Rehman3 Received: 29 December 2019 / Accepted: 1 October 2020 © Shiraz University 2020
Abstract Fiber-reinforced polymers (FRPs) are being widely used in the structural engineering because of their superior performance over conventional materials such as higher tensile strength, high corrosion resistance, electromagnetic resistance, good durability and light weight. The literature is deficient in the nonlinear finite element analysis (NLFEA) and theoretical predictions of FRP-confined concrete columns. The aim of the present work is to explore the structural performance of steel-tube FRP confined concrete (STC) columns under axial concentric loading. A NLFEA model of STC columns was simulated using ABAQUS which was then, calibrated for different material and geometric models of concrete, steel tube and FRP material using the experimental results from literature. The predictions of proposed NLFEA model were in close agreement with the previous experimental measurements. An extensive parametric study was performed to examine the effects of various parameters of STC columns. Furthermore, a large database of axial strength of 543 confined concrete compression members was developed from the previous researches to propose an empirical model that predicts the ultimate axial strength of STC columns accurately. Keywords Bearing capacity formula · Steel-tube concrete columns · CFRP-sheets · Nonlinear finite element analysis (NLFEA) · Concrete damaged plasticity (CDP) model · Parametric study
1 Introduction Fiber-reinforced polymers (FRPs) have superior properties over conventional steel such as low maintenance cost, high corrosion resistance, durability, higher resistance to fire and aesthetic appearance. Stainless steel has favorable mechanical properties to be used in the structures as a competitive material (Gardner et al. 1900). Although the steel tube confinement effectively enhances the concrete strength but, the outward local buckling of the column will decrease * Ali Raza [email protected] Babar Ali [email protected] Anees ur Rehman [email protected] 1
Department of Civil Engineering, Pakistan Institute of Engineering and Technology, Multan 66000, Pakistan
2
Department of Civil Engineering, COMSATS University Islamabad Sahiwal Campus, Sahiwal 57000, Pakistan
3
Department of Civil Engineering, University of Engineering and Technology, Taxila 47080, Pakistan
the effectiveness of steel tube confinement resulting in the degradation of axial load carrying capacity and ductility of columns (O’Shea and Bridge 2000; Fam et al. 2004). Thus, the additional confinement provided by the fiber-reinforced polymer (FRP) will be useful for the prevention of outward local buckling (Xiao 2004). Due to high stiffness, high corrosion resistance, higher strength, low weight and high durability, composite structures provide many advantages as comp
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