SEISMIC RESPONSE OF REINFORCED CONCRETE MOMENT RESISTING FRAMES OF BEAM-COLUMN JOINT YIELDING

The results of nonlinear dynamic analysis on the seismic response of reinforced concrete moment resisting frames in which beam-column joints are damaged are reported. In the analysis, beam-column joints are modeled with the simplified macro-element of beam-column joints to simulate the nonlinear behavior after the yielding of beam-column joints. The analytical results indicate that yielding of beam-column joints, which occurs in the beam-column joints with low column-to-beam strength ratio, induces the story collapse mechanism. The seismic acceleration levels of collapse are lower than the case of beam-column joints which do not yield.