Compressive behaviour of partially FRP confined concrete: Experimental observations and assessment of the stress-strain models

Authors

Weiqiang Wang, University of Technology SydneyFollow
M Neaz Sheikh, University of WollongongFollow
Ali Qasim Al-Baali, University of WollongongFollow
Muhammad N. S Hadi, University of WollongongFollow

RIS ID

131145

Publication Details

Wang, W., Sheikh, M. Neaz., Al-Baali, A. Q. & Hadi, M. N. S. (2018). Compressive behaviour of partially FRP confined concrete: Experimental observations and assessment of the stress-strain models. Construction and Building Materials, 192 785-797.

Abstract

This study provides new insight on the compressive behaviour of partially fibre reinforced polymer (FRP) confined concrete with either strain-hardening or strain-softening responses. Fully FRP confined concrete, partially FRP confined concrete with different strip gaps, and unconfined concrete were tested under axial compression. Four types of axial load-axial deformation behaviours were observed for specimens with different strip gaps. Even though a high volumetric ratio of FRP was applied, the confinement effectiveness was negligible when the strip gap exceeded the diameter of the specimens. Moreover, the axial stress-axial strain behaviours of wrapped and non-wrapped concrete were observed to be different, and significant strain localization was observed within the non-wrapped region. Based on the experimental observations and an extensive literature review, a confinement effectiveness coefficient was proposed for partially FRP confined concrete. A stress-strain model was then developed by considering the proposed confinement effectiveness coefficient. The developed stress-strain model provided better predictions than other existing stress-strain models.