梁崩壊型靱性架構の動的機構形成における定モード成分の抽出(続々)

概要

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In preceding papers of the same title published in the last but two and one issues of this journal, the author has examined features in the noticeable contribution of higher-order and evolving oscillation modes observed in story-to-story drifts and member-level deformations of weak-girder and strong-column frames. The current report lies along their extension; the mathematical tool of modal reasoning developed therein is now used to examine those effects with relation to the increasing amount of continuous story-to-story shear walls. Elongation of effective Period and variation of hereditary damping observed in response components corresponding to the second-order oscillation are shown to permit to account for the diminishing significance of the role of higher-order modes in story drifts and their still appreciable contribution in story shears. Then the effective second-order period tends to remain invariant during the progress of structural yielding, influenced by the elementary factor of elastic second-order versus fundamental periods. The latter is considered to provide a suitable measure for scaling the higher-order effects in coupled frame-wall systems.
一般社団法人日本建築学会の論文
1993-03-20