Numerical simulation and strength models of FRP-wrapped reinforced concrete columns under eccentric loading

Two finite element models are proposed to simulate the behavior of eccentrically loaded FRP-wrapped RC columns. Comparison between numerical and experimental results indicates that perfect bond can be used to simulate the interfaces between concrete and FRP as well as interface elements. The developing curves of lateral displacement are similar to sine half-wave curves. Twenty specimens were tested based on the finite element model using perfect bond between concrete and FRP composites. The result shows the maximum concrete compressive stress does not change with various parameters and the maximum concrete compressive strain is inversely proportional to eccentricity-to-section height ratio and length-to-section height ratio. An analysis-oriented model and a design-oriented model are proposed to predict the strength.

Research highlights
► Perfect bond could be used to simulate the interfaces between concrete and FRP.
► The maximum concrete compressive stress does not change significantly.
► The maximum concrete compressive strain is inversely proportional to e/h and L/h.
► The stress block factors of FRP-wrapped RC columns are different from those of RC columns.
► Two strength models for eccentrically loaded FRP-wrapped RC columns are proposed.