地震時における鋼構造せん断型多層骨組の損傷分布則

概要

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Total energy input into a structure exerted by an earthquake ground motion is scarcely affected by the strength and deformation characteristics of the structure. The distribution of damages, however, depends largely on the distribution of the strength of the structure. For the practical purpose of the structural design based on the ultimate strength design concept, it is essentially necessary to predict the concentration of damages which causes the collapse of the weakest story in a multi-story structure. In this paper, a basic law which governs the distribution of damages in shear-type multi-story steel buildings is derived through numerical response analyses, and is expressed in a simple empirical formula. Strain-hardening of structural steels is a preferable property to mitigate damage concentration. On the other hand, deterioration of restoring forces of the skeleton due to instability such as local buckling and flexural torsional buckling of structural members accelerates the concentration of damages. Thorough understanding and quantitative evaluation of these phenomena can be made by the analytical application of the proposed empirical formula.
1978-08-30