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The paper presents a numerical study on the effects of the column over-desigh factor on earthquake responses of moment resistant frames composed of concrete filled tubular(CFT) columns. The first obje...ctive is to compare the response characteristics of the beam collapse mechanism and the column collapse mechanism in which outer columns remain in elastic. The second is to demonstrate that the column collapse mechanism would be one of the effective earthquake-resistant mechanisms for CFT structures. To achieve the objectives, a dynamic response analysis was performed, where the major analytical parameters were: (1)the types of mechanisms; (2)ratios of the column over-design factors; and (3)types and intensities of earthquake ground motions.show more
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jaud004_p151