The purpose of the paper is to introduce a system that reduces the occurrence of weak-story in the event of earthquake. Weak-story concentrates deformation on the story and causes all member to collapse before the capacity of all member is reached. This paper introduces Strong-Back system (SB) to protect weak story. SB is a hybrid of zipper frame, tied eccentrically braced frame, and elastic truss system and it is divided into elastic and inelastic areas. Elastic areas prevent the generation of weak story by distributing energy, and inelastic areas dissipate energy through buckling or yielding. In this paper, the seismic performance is evaluated by comparing the four type braced frame with SB through push-over analysis. The four criteria are compared from the base shear, the ductility capacity, the column failure order, and the quantity of brace. As a result, SB proved to have sufficient performance to protect the weak-story.

Abstract
1. 서론
2. 선행 연구
3. 연구 개요
    3.1 연구 표본
    3.2 Midas 모델링
4. 해석 결과의 검토
    4.1 표본의 푸쉬오버 해석
    4.2 해석 결과 비교
5. 결론
References

• 김다영(서울과학기술대학교 건축과) | Kim Da-Young (School of Architecture, Seoul National University of Science and Technology)
• 유정한(서울과학기술대학교 건축공학과) | Yoo Jung-Han (School of Architecture, Seoul National University of Science and Technology) 교신저자