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

提出了一种基于耦合系数的钢框架结构震后状态评估方法。通过有限的监测数据和结构设计图纸估算出结构最大反应时的位移分布，计算出结构各层的内力分布和破坏机理，初步的有限元分析表明，结构的整体和局部工作模态等重要信息在位移反应中并不明显。有用的信息是每层的损伤是否主要分布在梁或柱上。对在E-Defense振动台设施测试的18层钢框架进行的增量动力分析证实，通过基于CC的方法识别的结构状况与目视检查报告的损坏信息相对应。

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.