ABSTRACT
For a column subjected to a uniaxial compressive load, it is well established that fibers should be aligned along the hoop direction to confine the dilation of the concrete core. In practice, however, almost all the columns are subjected to an eccentric axial load, which can be resolved into a uniaxial compressive load and a bending moment. Because of this, almost all the columns should be treated as beamcolumns. For beam-column, hoop direction is the optimal fiber orientation only for uniaxial compressive load; for a bending moment, fibers in the axial direction are more favorable. Therefore, fiber orientation is an important variable in the structural design of FRP-wrapped concrete columns. [6]
In the present paper, focuses are on applications of carbon FRP (CFRP) wraps with various fiber orientations and wrap thickness to increase the axial strength and ductility of unreinforced circular concrete columns.
