Behavior of GFRP-RC columns under axial compression: Assessment of existing models and a new axial load-strain model
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Date
2022
Authors
Ye, Y.Y.
Zhuge, Y.
Smith, S.T.
Zeng, J.J.
Bai, Y.L.
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Journal of Building Engineering, 2022; 47(103782)
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Concrete structures reinforced with fiber-reinforced polymer (FRP) bars (referred to as FRP-RC structures) are becoming increasingly popular, whereas there is a lack of a robust full-range axial load-strain model for FRP-RC columns, which is fundamental for the design and advanced analysis of FRP-RC structures. To this end, a review and assessment of existing confined compressive concrete ultimate axial stress (or strain) models (including models for glass FRP (GFRP) spiral-confined concrete (GFSCC) and models for FRP partially confined concrete (FPCC)) against a newly established database are reported in this paper. The comparisons show that the models of FPCC are applicable to GFSCC. A new design-oriented full-range axial load-strain model is then proposed for GFRP-RC columns of circular cross-section by explicitly considering the behavior of three key components in FRP-RC columns, namely, confined concrete core, FRP longitudinal reinforcement and concrete cover. The novelty of the proposed model is that the constitutive models of the three components in FRP-RC columns can be considered in separation. The proposed model, which is able to capture the strain softening behavior properly, provides satisfactory predictions of the axial load-strain test curves of FRP-RC columns.
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Copyright 2021 Elsevier
Access Condition Notes: Accepted manuscript available after 1 January 2024