Ultimate Earthquake Resistant Capacity of CFT-Frame Based on Dynamic Collapse Behavior

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The seismic response and damage of many concrete filled steel tube frames (CFT frames) under strong ground motion have been analyzed numerically and it is pointed out that the ultimate earthquake resistant capacity of CFT frame, which is decided on the basis of the dynamic collapse of CFT frame, is strongly effected not only by the story-shear strength distribution and the column-over-design factor but also by the filled concrete-to-steel tube strength ratio.To predict the ultimate earthquake resistant capacity of CFT frame and the effects of these design factors on it, a simple design formula is derived from the calculated seismic responses of CFT frame. It is ascertained that the formula is simple but it can approximate well the damage ratio of CFT frame that is corresponding to the ultimate earthquake resistant capacity of it.