1-D 요소를 이용한 철골모멘트골조의 WCPF 접합부 해석모델 개발: 연쇄붕괴 저항성능 평가를 위한 (Development of Welded Cover Plated Flange Connection Analysis Model of Steel Moment Frame Using 1-D Element: For Evaluation of Progressive Collapse Resistance Performance)