COLLAPSE BEHAVIOR OF STEEL MOMENT RESISTING FRAME AND NON-LINEAR FRAME ANALYSIS : Test on full-scale three story frame for evaluation of seismic performance

Abstract

The bending moment resistance of the column bases decreased seriously during overall drift angle 1/15rad loading, because of the fracture of the anchor bolts in tension side and the crash of concrete placed under the base plates in compression side. The inflection point of first story columns moved to lower by column base moment resistance decreasing and increased the bending moment at the first story column top. In result, local buckling occurred at the first story column top and formulated the first-story collapse mechanism. The first story shear decreased significantly with the increase in story drift angle from 1/20 to 1/8rad, while the second story was unloaded.