(26)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

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, are discussed and investigated. The steel beam under consideration is idealized to the one subjected to the repeated variable end rotations under constant lateral load. Based on the well-known static shakedown theory, simple and effective equations governing the incremental collapse limit are formulated, which are available for both ranges before and after the alternating plasticity limit. Several specific characteristics of the incremental collapse and its limit deduced from the derived governing equations are indicated, and compared with the ordinary instantaneous collapse limits for the lateral load. Explicit expressions of the incremental collapse limit are, for the some prescribed distribution shapes of lateral load, given in the magnitude of the variable domain of end rotations and constant lateral load. Also, limits which yield no incremental collapses, under any distributed lateral loads, and independently of the magnitude of the variable domain of end rotations, are discussed.
一般社団法人日本建築学会の論文
1999-03-10