ABSTRACT
In this paper, the nonlinear structural deformation behavior of FRP-reinforced concrete beams is
investigated by using a newly developed one-dimensional composite beam element with only
two nodes and two degrees of freedom at each node. In the new element, both concrete and
reinforcing bars are modeled simultaneously and Timoshenko’s composite beam functions are
employed to represent the displacement interpolations functions. Geometric nonlinearly and
material nonlinearity have been accounted for in themodeling so as to provide themost accurate
prediction of the structural behavior. The influences of a series of parameters on the nonlinear
structural behavior of the FRP-reinforced concrete beams including different type of reinforcing
bars (steel, CFRP, GFRP, and basalt fiber) and different ratios of the reinforcement are studied.
The investigated result will provide important guidance and information for performancebased
structural design of FRP-reinforced concrete beams.
Keywords: FRP-reinforced concrete beams, Geometric nonlinearity, Material nonlinearity, Nonlinear finite element analysis, One-dimensional composite beam element, Timoshenko’s composite beam functions.
