Test on Collapse Behavior of 3D Full-Scale Steel Moment Frames Subjected to Cyclic Loading

Abstract

鋼構造物の耐震能力を定量化するため，3層実大鋼構造骨組を対象に，それが耐力を失うまでの挙動を実験的に検証した．耐震設計で考えられる変形領域までは，骨組各部材はバランスよく変形した．しかし，より大きな変形領域では柱脚部の降伏によるピンチング効果が現れ，さらに床スラブと梁の合成効果が低減した．最後に柱脚損傷の蓄積が柱降伏型の1層崩壊を誘発した．ALC版が構造挙動に及ぼす影響は無視できる．

This paper reports on a full-scale test on a three-story, two-span by one-span steelmoment frame to characterize the cyclic behavior beyond the deformation rangesconsidered in the contemporary seismic design. The following observations are noted:Balanced deformations between members were observed in contemporary deformation.In the larger deformation, pinching behavior was notable because of cyclic yielding atcolumn bases, and composite action between steel beams and RC slabs decreased. Thefinal failure occurred by first-story collapse mechanism promoted by severedeterioration of column bases. The effect of ALC panels on the structural behavior wasnearly null.