Journal
ENGINEERING STRUCTURES
Volume 175, Issue -, Pages 501-516Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2018.07.099
Keywords
FRP-confined concrete; High-strength concrete (HSC); Lateral confinement; Axial compression; Ultimate axial stress and strain; Stress-strain relations
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This study presents a simple yet powerful design-oriented model that makes use of commonly available input data to predict the axial stress strain behavior of fiber reinforced polymer (FRP)-confined concrete in circular sections. The approach of identifying the most influential parameters on the axial compressive behavior of FRP-confined concrete and developing new expressions based on these parameters by balancing accuracy and simplicity of use was adopted. A comprehensive experimental test database of FRP-confined normal-strength and high-strength concrete (NSC and HSC) was compiled and used in the model development. Although the proposed expressions to predict the axial stress and strain at the ultimate and transition point of the stress-strain curve were simple, the results show that they performed as good as or better than the best performing existing models. Based on these expressions a model to predict the complete axial stress-strain curve of FRP-confined concrete was developed and verified against the available experimental data. The proposed model is applicable to both FRP-confined NSC and HSC with compressive strengths up to 120 MPa, and is the first accurate design-oriented model to provide the complete stress-strain curve of FRP-confined HSC.
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