梁の損傷特性と床スラブとの合成効果 : 実大3層鋼構造骨組を用いた耐震性能実証実験

概要

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This paper presents detailed results on damage sustained by beams of a full-scale three story steel moment frame subjected to large cyclic loading. Intentional connection defects (misalignment and insufficient fusion of welds) were embedded at few beam-to-column connections. Misalignment by 3mm between the diaphragm plate and beam flange caused brittle fracture at a beam rotation of 1/27 rad. Otherwise, effects of small defects on the overall behavior remained minimal. Composite action was observed for the strain distribution along the beam depth and for the increase in bending strength during the positive loading. Effects of composite action, given as the difference between the positive and negative bending moments for the same rotation, increased for larger story drifts. The degree of increase, however, was not as large as that estimated by commonly used effective-width approaches.
2005-07-30