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Computers and Concrete Volume 31, Number 6, June 2023 , pages 527-536 DOI: https://doi.org/10.12989/cac.2023.31.6.527 |
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Numerical modelling of circular reinforced concrete columns confined with GFRP spirals using fracture-plastic model |
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Muhammad Saad Ifrahim, Abdul Jabbar Sangi and Shuaib H. Ahmad
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| Abstract | ||
| Fiber Reinforced Polymer (FRP) bar has emerged as a viable and sustainable replacement to steel in reinforced concrete (RC) under severe corrosive environment. The behavior of concrete columns reinforced with FRP bars, spirals, and hoops is an ongoing area of research. In this study, 3D nonlinear numerical modelling of circular concrete columns reinforced with Glass Fiber Reinforced Polymer (GFRP) bars and transversely confined with GFRP spirals were conducted using fractureplastic model. The numerical models and experimental results are found to be in good agreement. The effectiveness of confinement was accessed through von-mises stresses, and it was found that the stresses in the concrete's core are higher with a 30 mm pitch (46 MPa) compared to a 60 mm pitch (36 MPa). The validated models are used to conduct parametric studies. In terms of axial load carrying capacity and member ductility, the effect of concrete strength, spiral pitch, and longitudinal reinforcement ratio are thoroughly investigated. The confinement effect and member ductility of a GFRP RC column increases as the spiral pitch decreases. It is also found that the confinement effect and member ductility decreased with increase in strength of concrete. | ||
| Key Words | ||
| circular column; confinement; FEM; fracture-plastic model; GFRP RC column; noncorrosive rebar; numerical modelling | ||
| Address | ||
| Department of Civil Engineering, NED University of Engineering and Technology, Karachi, Pakistan | ||