Finite-Element Modeling of FRP-Confined Noncircular Concrete Columns Using the Evolutionary Potential-Surface Trace Plasticity Constitutive Model for Concrete
Publication: Journal of Composites for Construction
Volume 27, Issue 1
Abstract
The compressive behavior of fiber-reinforced polymer (FRP)-confined concrete columns with a noncircular cross section has been investigated through extensive experimental, analytical, and numerical research, but a unified theoretical/numerical approach that can accurately predict both their section-average behavior and local concrete behavior is not yet available. In noncircular columns under axial compression, the concrete is typically under a nonuniform stress state of three-dimensional (3D) compression, with the lateral compressive stresses being the reactive stresses from the confining device (i.e., passive confinement). The authors of the present paper recently developed a plasticity constitutive model for concrete under general 3D compressive stresses, which possesses a potential surface with an evolutionary deviatoric trace that can accurately capture the results of existing compression tests of concrete cubes under nonuniform, passive confinement. This paper explores the application and capability of this evolutionary potential-surface trace (EPT) plasticity constitutive model in finite-element (FE) analysis of FRP-confined square, rectangular, and elliptical plain-concrete columns under concentric compression. The section-average behavior of all the selected noncircular columns predicted by these FE analyses was close to the existing experimental data. The numerical results obtained with the EPT plasticity constitutive model were then examined in detail to achieve an improved understanding of local concrete behavior in FRP-confined noncircular columns.
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Data Availability Statement
Some data and the computer code that support the findings of this study are available from the corresponding author upon reasonable request. The available data include the results of the finite element analyses. The mathematical formulation of the adopted plasticity model for concrete is available at https://doi.org/10.1016/j.engstruct.2021.113435., and its FORTRAN code may be released by the authors in the future.
The authors are grateful for the financial support received from the Research Grants Council (RGC) of the Hong Kong Special Administrative Region, China (Project Nos. PolyU152203/18E and T22-502/18-R).
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Published In
Journal of Composites for Construction
Volume 27 • Issue 1 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Mar 17, 2022
Accepted: Jul 31, 2022
Published online: Oct 31, 2022
Published in print: Feb 1, 2023
Discussion open until: Mar 31, 2023
ASCE Technical Topics:
- Columns
- Compression
- Concrete columns
- Constitutive relations
- Continuum mechanics
- Deformation (mechanics)
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fiber reinforced polymer
- Finite element method
- Materials engineering
- Mathematics
- Methodology (by type)
- Model accuracy
- Models (by type)
- Numerical methods
- Plasticity
- Polymer
- Solid mechanics
- Structural behavior
- Structural dynamics
- Structural engineering
- Structural mechanics
- Structural members
- Structural systems
- Synthetic materials
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