繰り返し載荷を受けるH形鋼梁の横座屈挙動と横座屈補則

概要

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This paper presents a numerical study on lateral torsional buckling, out-of-plane deformation in the post-buckling regime, and strength deterioration of wide-flange steel beams subjected to cyclic loading. The maximum strength obtained in monotonic loading, maximum strength experienced during cyclic loading, and reserved strength after completion of cyclic loading were examined carefully, and the following observations were made, (1) Strength degradation due to load reversals is significant, and the monotonic maximum strength is not a reasonable measure to estimate the reserved strength achieved in cyclic loading. (2) Lateral bracing requirements stipulated in the present Japanese seismic codes are not adequate for beams in steel moment frames built in regions with high seismicity. (3) Lateral bracing lengths that ensure sufficient rotation capacity of wide-flanee beams are proposed.
社団法人日本建築学会の論文
2001-06-30