Testing and Finite Element Analysis of GFRP Reinforced Concrete Frame Joints

摘要

The use of GFRP as main reinforcement in concrete structures is an attractive option for structures in aggressive environments. The use of GFRP reinforcement in frame corner joints may be problematic considering the weak link at the reinforcement bend, and it has not been previously studied. The presented experimental program studies the effect of reinforcement ratio and confinement stirrups on the behaviour of the joint. The failure mode was altered from bar rupture to failure of diagonal strut by increasing the reinforcement ratio, however had minimal effect on ultimate strength. The results also indicated a substantial increase in ultimate strength and maximum deflection with the addition of confinement stirrups. The finite element analyses performed suggested good model predictions for failure moments and deflections, but were unable to completely capture the concrete failure within the joint. The suspected cause is the modelling of the bond between the reinforcement and concrete.