| Title |
Nonlinear Analysis of FRP Jacketed Concrete Beams by Mixed Finite Elements |
| Keywords |
Mixed Finite Element ; Nonlinear Analysis ; FRP Concrete ; Constitutive Model ; Multiaxial Stress State |
| Abstract |
This research presents a nonlinear mixed frame fiber finite element formulation of FRP confined concrete members. Since the mixed finite element formulation don't use the displacement shape functions, the formulation in nonlinear problem can satisfy the equilibrium not only in the section and element levels but also in the structural level. Concrete in compression is modeled as an inelastic material in triaxial stress state in order to predict confining effect of concrete. The FRP sheet is modeled as a layered composite material in two-dimension. A series of four-point bending test of CFRP sheet and concrete composite beams with circular sections is analyzed by the current mixed finite element model. Compared with the test results, it was shown that the model could give well predicted load-deflection responses in the structural level as well as axial and hoop strains in section levels. |