梁部材の終局挙動が鋼構造多層骨組の耐震性能に与える影響

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One of the most remarkable damage mode in the steel moment frames at the Hyogoken-Nanbu Earthquake (1995 Japan) is fracture in the beam-to-column connections. From those damages, the following problem is pointed out. "Which is better in current design method, to restrain local buckling or to permit local buckling in beam ends, in order to give enough earth quake resistance to weak beam type steel moment frames?" In this paper, inelastic response analysis of 9 story weak beam type steel moment frames were carried out using the realistic hysteresis characteristics of members. The ultimate states of structures were clarified under several states of beams such as locally buckled with only a few plastic deformation capacity, locally buckled with some plastlc deformation capacity, locally buckled with sufficient clastic deformation capacity or tensile cut off in flange. From analytical results, following conclusions were derived: 1) To restrain local buckling of beams with a little plastic deformation capacity against local buckling, is quite effective to enhance the earthquake resistance of weak beam type steel moment frames. 2) To give sufficient plastlc deformation capacity against local buckling to beams is effective to get enough earthquake resistance of weak beam type steel moment frames. But once local buckling is occurred, the energy absorption by Bauschinger effect can not be expected and damage concentrates in the damaged part of structures.
社団法人日本建築学会の論文
2000-09-30

梁部材の終局挙動が鋼構造多層骨組の耐震性能に与える影響

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