Study on Strain Responses and Numerical Modeling of FRP-Partially Confined Concrete Columns Using DIC Testing and Finite Element Modelling

ABTRACT: Applications of Fiber-Reinforced Polymer (FRP) in Partially Confined Concrete: Improving Economic Value and Load-Bearing Capacity. However, there is still a need for more thorough analysis of the non-uniform vertical strain response and precise stress-strain models for FRP partially confined concrete. In this study, we used Digital Image Correlation (DIC) and strain gauges to collect data during axial compression tests on FRP partially confined concrete specimens. Additionally, partial confinement concrete is modeled using Finite Element Analysis using ABAQUS with a range of constraint area ratios, including 0, 1/4, 1/3, 1/2, 2/3, 3/4, and 1. According to the experimental findings, the specimens either responded to strain by hardening or softening in both the vertical and horizontal directions. For various constraint area ratios, the Finite Element results accurately reflected the relationship between surface constraint forces and axial strains in the x, y, and z axes. Under different constraint area ratios, a proposed stress-strain model showed high predictive accuracy for FRP partially confined concrete columns.