強震を受ける弾塑性多質点系のモーダルエネルギー : 損傷に及ぼす高次モードの影響

概要

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Modal energy, which is defined as the work done by elastic modal shear forces during dynamic motion is investigated on the basis of elasto-plastic response analysis of shear-type MDOF-systems. Major findings are as follows : the modal energy is primarily governed by elastic modal properties of systems represented by natural periods and participation factors, but is scarcely affected by plastic properties such as the D_s-value or the amount of plastic damage, the shape of hysteresis curves, and the distribution of yield shear coefficients or the damage distribution ; and the modal energy can be easily predicted from the smoothed Fourier amplitude spectrum of the base acceleration using the natural periods and participation factors associated with the elastic modes.
1994-11-30