Strain response and numerical modelling study of FRP partially confined concrete columns based on finite element and DIC tests

doi:10.19936/j.cnki.2096-8000.20240628.010

Abstract

Abstract: Fibre reinforced polymer (FRP) partially confined concrete applications can improve the load-bearing capacity and economic value of concrete. However, the response of FRP partially confined concrete to inhomogeneous strains in the vertical direction is not sufficiently well developed and the stress-strain model is not sufficiently accurate. In this paper, axial compression tests are first carried out on FRP partially confined concrete by means of strain gauges and digital image correlation (DIC) records. In addition, partially confined concrete including 0/1, 1/4, 1/3, 1/2, 2/3, 3/4 and 1/1 confined area ratios are established using ABAQUS finite elements. The experimental results show that the DIC and strain gauge results respond to the strain patterns in the vertical and horizontal directions respectively, i.e. the specimens undergo significant strain localisation in either strain hardening or strain softening response; the finite element results were able to capture the surface restraint force of the specimen with respect to the x, y and z-axis strains, and the stress-strain relationships were obtained for FRP partially restrained concrete columns with different restraint area ratios, and the proposed stress-strain model was able to have a high predictive effect.

Key words: failure modes, stress-strain behaviour, finite element analysis, FRP partial restraint, DIC technique, composite

CLC Number:

TB332

JI Yongcheng, ZOU Yunfei. Strain response and numerical modelling study of FRP partially confined concrete columns based on finite element and DIC tests[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(6): 76-86.

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