EXPERIMENTAL STUDY ON ASEISMIC BEHAVIOR OF LOCALLY USED HDC ASSEMBLED FRAME BEAM-COLUMN JOINTS

In order to improve the deformation and energy dissipation capacity of fabricated beam-column joints and avoid the construction difficulties caused by crowded steel bars, high ductile fiber reinforced concrete (HDC) is used as the core material of beam-column joints. Considering the influence of axial compression ratio and stirrup ratio, 5 fabricated beam-column joints partly adopted HDC and 1 reinforced concrete (RC) beam-column joint were tested. The failure patterns, hysteretic characteristics, deformation capacity, stiffness degradation, energy dissipation capacity and shear deformation of the joint core area were analyzed. The results are as follow. First, failure position changed from node core area to beam end after adopted HDC in node core area. The design principle of a strong node is realized, and the deformation ability and energy dissipation capacity of frame nodes are effectively improved. Second, column ends should be strengthened because the failure position transferred to the end of column adopted HDC in the node area and beam end. Third, the amount of stirrups can be reduced when HDC is used in node core area.