Abstract
This paper investigates numerically the behaviour of rectangular RC columns strengthened with carbon fiber reinforced polymer (CFRP) composites under uniaxial loading. For this a reason, a parametric study is conducted and the effects of CFRP layers number, compressive strength of unconfined concrete, and fiber orientation on the behaviour of such columns have been studied. The number of CFRP layers has been changed from one to five layers while the fibers are oriented transversely. Compressive strength of unconfined concrete has been increased from 26 MPa to 45 MPa. In addition, three different fiber orientations are considered. The results show that an increase in the number of CFRP layers would enhance the ultimate strength of specimens. Although increasing the number of layers would not increase the ultimate strength of specimens exponentially, but the rate of strength gain would also decrease. Moreover, it is shown that lateral strains increase as the layer number increases. The effect of unconfined concrete strength on the ultimate strength is less for low strength concrete than high strength concrete. Evaluating the effect of fiber orientation shows that the maximum ultimate strength is obtained from transverse orientation and as the angle of orientation increases, the ultimate strength decreases.
Highlights
In recent years, fiber-reinforced polymers (FRPs) are used widely for strengthening reinforced concrete (RC) columns to achieve more strength and ductility
This paper presents the results of a parametric study on the behavior of rectangular RC columns strengthened with the carbon fiber reinforced polymer (CFRP) composites under axial loading
Compressive Strength of Unconfined Concrete To evaluate the effect of compressive strength of unconfined concrete on the behavior of CFRP-confined rectangular reinforced concrete columns, it has been changed from 26 MPa to 45 MPa
Summary
Fiber-reinforced polymers (FRPs) are used widely for strengthening reinforced concrete (RC) columns to achieve more strength and ductility. In non-circular RC columns, the compressive strength of confined concrete is a function of the cross-sectional aspect ratio, the height, the corner radius, the unconfined concrete strength, the longitudinal and transverse reinforcement ratio, and the mechanical properties of FRPs. Wu et al [3] presented the results of an experimental study on the behavior of axially loaded rectangular columns. Chaallal et al [6] carried out a comprehensive experimental investigation indicating the effects of the concrete strength, the aspect ratio and the number of CFRP layers on the behavior of axially loaded short rectangular columns. The effects of parameters like the unconfined concrete strength, the number of CFRP layers, and the fiber orientation on the behavior of RC columns are studied
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