Finite Element Modeling of Axially Loaded CFRP-Confined Rectangular Reinforced Concrete Columns
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.
Keywords: Axial Load;
Rectangular Concrete Columns; Carbon Fiber Reinforced Polymer; Strength;
Ductility
Author: Hamed Akbarpour,
Masoumeh Akbarpour
Journal Code: jptsipilgg160029
