Behavior of beam-high performance fiber reinforced CFST column joints

Abstract

This paper presents a serial of test results of beam-high performance fiber reinforced CFST column joints (beam-HPFR CFST column joints). A total of four exterior joints specimens are tested experimentally. The test parameters are the thickness of the flush end plate and the ratio of the steel fiber. Moment- relative rotation relationships of the current tested joints are discussed and their characteristics are evaluated in terms of initial stiffness, moment capacities and ductility. The results are analyzed and compared with the EC3 prediction. The results show that, the initial stiffness and the maximum deflection of the steel beam increases with increasing the steel fiber ratio. Likewise, the rotation capacity of beam-HPFR CFST column joints exceeds 0.04rad and increases up to 0.08rad by increasing the ratio of fiber. Hence, the ductility of the current joints satisfies the required ductility for the seismic provisions for special moment frames AISC, 2010. Finally, the finite element (FE) model using ABAQUS program is used based on the test geometry. The FE models are verified by comparing with the current experimental results. The FE model predicts well the complete moment-relative rotation curves for the tested specimens in terms of initial stiffness, strength, rotation capacity and maximum vertical displacement of beams. In addition, the failure mode of the FE provides good agreement with the experimental results.