最下層の非線形挙動を考慮した多質点系構造物の地震応答性状(等価2質点系の設定)

概要

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The complete failure of the first floor often induce the entire collapse of the whole structure. This would suggest us the importance to study the nonlinear earthquake response behavior, especially the response under the first floor being damaged severely. Such nonlinear earthquake response behavior of the multi-mass systems will be studied. The main subject of this paper is to devise a means to, derive the EQUIVALENT-TWO-MASS SYSTEM which should denote the similar response characteristics to that of a given multi-mass system. In this paper, the nonlinear hysteretic characteristics are assumed only for the first floor, and the upper floors to remain in linear elastic region during the earthquake duration. This paper begins by showing that when the first floor is proceeding in plastic flow after yielding, the multi-mass system could be treated clearly by the method of MODAL ANALYSIS. And the first order madal component is predominant to other higher order components as could be observed on the linear multi-mass system. This feature can be available to derive the EQUIVALENT-TWO-MASS SYSTEM. Then, the comparison of earthquake response behaviors of the multi-mass system with that of the associated EQUIVALENT-TWO-MASS SYSTEM will be made briefly.
1977-12-01