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http://dx.doi.org/10.11112/jksmi.2022.26.1.58

Analytical Study on Concrete Cover Thickness of Anisotropic FRP Bar  

Yi, Seong-Tae (Department of Civil and Environmental Engineering, Inha Technical College)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.26, no.1, 2022 , pp. 58-66 More about this Journal
Abstract
In this study, to examine the effect of the transverse thermal expansion behavior of FRP reinforcing bars and concrete on the concrete cover thickness, based on 20℃, when the temperature changes from -70℃ to 80℃, the behavior of concrete was studied theoretically and numerically. Theoretical elastic analysis and nonlinear finite element analysis were performed on FRP reinforced concrete with different diameters and cover thicknesses of FRP reinforcement. As a result, at a negative temperature difference, concrete was compressed, and the theoretical strain result and the finite element result were similar, but at a positive temperature difference, tensile stress and further cracks occurred in the concrete, which was 1.2 to 1.4 times larger than the theoretical result. The ratio of the diameter of the FRP reinforcing bar to the thickness of the concrete cover (c/db) is closely related to the occurrence of cracks. Since the transverse thermal expansion coefficient of FRP reinforcing bars is three times greater than that of concrete, it is necessary to consider this in design.
Keywords
FRP reinforcing bars; Transverse thermal expansion coefficient; Finite element method; Concrete cover thickness;
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