多層多スパンはり降伏型鉄骨架構におけるはりの漸増塑性崩壊 : その2 はり両端の位相のずれの影響

概要

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Incremental collapse phenomena and its limits of the beam in the weak-beam type steel frame, which might happen under severe earthquake ground-motion, were discussed and unifiedly formulated in the Refs. 1), 2). In this paper, influence of the phase's lag of the beam end rotations on the incremental collapse phenomena and its limits of the beam are investigated. In order to know how amount of phase's lag, simple dynamic elasto-plastic response analyses of the 6-story and 3-span steel frame structure subjected to harmonic ground motions are carried out. According to the method presented in the Ref.1), which based on the well-known static shakedown theory, the incremental collapse limits of the beam subjected to repeated variable end rotations with phase's lag under constant lateral load are explicitly given, and show that the resisting force of the beam to the lateral load are drastically decreased when there is some amount of phase's lag of the beam end rotations.
一般社団法人日本建築学会の論文
2000-03-20