3D Finite Element Modelling of FRP Confined Concrete Column

Abstract

Modelling concrete columns confined with fiber-reinforced polymer (FRP) using finite element (FEM) analysis is a difficult task due to the need for precise definition of material and interaction parameters. The inclusion of FRP confinement in composites introduces complexities in representing the volumetric behavior of concrete under triaxle stress conditions. The behavior of confined concrete differs from that of non-confined concrete due to the passive nature of FRP confinement, requiring consideration of flow rules, damage parameters, strain hardening/softening constitutive relationships, and a pressure-dependent yield criterion. This project aims to address these challenges by proposing a modified plastic damage model, a concrete dilation model, and a new set of concrete hardening/softening rules using the advanced FE program ABAQUS CAE. The FE model’s strengths and limitations are evaluated by comparing it with experimental results from this project, as well as other findings from literature, including both experimental and analytical studies.