Abstract

There have been proposed various analytical methods which may apply to steel moment frames subjected to strong earth-quakes. Most of them, however, are still too complicated or too simplified to evaluate the energy absorption capacity of structures affected by strain-hardening and various modes of buckling in inelastic range. To combine the prediction of story-frame behavior with the damage distribution law of structure, the energy absorption capacity of structures can be estimated. In this paper, inelastic story-frame analysis based on frame-unit concept is proposed. The frame-unit is a smallest unit of frame which is conveyable of the fundamental information of structural components. The frame-unit consists of one beam, one column and joint panel of them. The story-frame can he considered to be a collected body of frame-units. The structural behavior of the frame-unit up to it's ultimate state can be evaluted experimental basis and the overall behavior of the story-frame can be estimated through simple summation of the individual behavior of frame-units. Applicability of the method is verified by the experiment on 2-stories, 3-spans steel frame and steel portal frames with practical structural parameters.

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