INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Review of Key Issues in FRP-confined Concrete |
XIANG Zehui1,2, WANG Jun1, NIU Jiangang1,*, ZHOU Jie1
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1 Department of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia,China 2 Inner Mongolia Naiheng Engineering Technology Co., Ltd., Baotou 014010, Inner Mongolia,China |
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Abstract In this paper, we performed an international literature review of fiber reinforced polymer (FRP) concrete. 29 peak stress models and 19 peak strain models of FRP-confined concrete were selected, and the accuracy of the models was verified according to the relevant measured data from peer-reviewed data. The results show that the prediction accuracy of these models for the strongly-confined concrete is inadequate. Therefore, we offer a relatively simple peak stress and strain model with better accuracy by piecewise fitting. Based on the literature, the two factors that affect the radial constraint force are elastic modulus of FRP and rupture strain. We suggest that :(1) compared with low elastic modulus FRP, high elastic modulus FRP can delay the damage of concrete and improve the mechanical properties of concrete in the core zone, (2) construction disturbance, stress difference and material heterogeneity decrease FRP rupture strain, (3) for carbon fiber reinforced polymer (CFRP), glass fiber reinforced polymer (GFRP), and aramid fiber reinforced polymer (AFRP), the effective coefficient of rupture strains are 0.723, 0.774, and 0.774, respectively. The purpose of this paper is to provide reference for the extended application of FRP-confined concrete.
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Published: 10 January 2023
Online: 2023-01-31
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Fund:National Natural Science Foundation of China (51968058), Inner Mongolia Autonomous Region Talent Development Found, Program for Young Talents of Science Technology in University of Inner Mongolia Autonomous Region (NJYT-18-A06), the Natural Science Foundation of Inner Mongolia Autonomous Region(2021MS05012), and the Open Fund Project of the Institute of Building Science of Inner Mongolia University of Science and Technology(JYSJJ-2021M16). |
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