Rapid evaluation of structural soundness of steel frames using a coupling coefficient (CC)-based method

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A method for evaluating the post-earthquake condition of steel frame structures based on the coupling coefficient (CC) has been developed. The CC is an index that reflects each story's internal force distribution and damage mechanism in frames, computed with the drift distribution at the maximum structural response estimated from limited monitoring data and the design drawings of the target structure.Preliminary finite element analyses showed that the CC contains some important information that is not obvious in displacement responses, such as the structure's global and local working modes. Useful information is whether the damage to each story is mainly distributed on the beams or columns. An incremental dynamic analysis with an 18-story steel frame tested at the E-Defense shaking table facility confirmed that the identified structure's condition by the CC-based method corresponds to the damage information reported by visual inspection.