Steel moment frame connections are vital in moment frames designed to resist forces transferred from adjoining beams and columns. The welded unreinforced flange-welded web (WUF-W) connection is one of the pre-qualified connections used for steel special moment frames (SMFs). This study developed drift-based fragility functions for WUF-W connections based on test data of 35 WUF-W connection specimens from ten previous experimental studies. Four different damage states were defined to calculate the fragility: onset of yielding, local buckling, strength loss, and fracture. Fragility functions were derived assuming that lognormal distribution was validated using the Kolmogorov-Smirnov (K-S) test. It was confirmed that fragility functions for WUF-W connections were accurately proposed within a specified confidence interval. The fragility functions proposed in this study exhibit smaller standard deviations compared to FEMA P58, thereby reducing the likelihood of overestimating or underestimating damage at specific drift ratios. Furthermore, these functions remain within the confidence intervals across all damage states, contributing to improved accuracy in damage analysis and loss estimation in performance-based earthquake engineering.

단풍나무는 종족 번식을 목적으로 씨앗을 확산시키기 위해 바람을 이용한다. 모수에서 분리된 씨앗은 자동회전을 하면서 떨어지는데 이 회전을 통해 생성된 앞전 와류로 높은 양력을 발생시킴으로써 씨앗을 천천히 낙하시킨다. 단풍나무 씨앗의 자동회전 현상은 안정적인 공기 역학적으로 낙하 초기 자세에 상관없이 일정한 크기의 회전율과 낙하 속도를 갖고 있어서 산업적 응용 가능성도 크다. 본 연구에서는 단풍나무 씨앗의 자동회전 현상의 특성을 실험적으로 밝히고 이를 생체 모방하여 소형 풍력 터빈으로 개발할 가능성을 제시하고자 한다.