In the case of a school building, even though it is a regular structure in terms of plan shape, if the masonry infill wall acts as a lateral load resisting element, it can be determined as a torsionally irregular building. As a result, the strength and ductility of the structure are reduced, which may cause additional earthquake damage to the structure. Therefore, in this study, a structure similar to a school building with torsional irregularity was selected as an example structure and the damping performance of the PC-BRB was analyzed by adjusting the eccentricity according to the amount of masonry infilled wall. As a result of nonlinear dynamic analysis after seismic reinforcement, the torsional irregularity of each floor was reduced compared to before reinforcement, and the beams and column members of the collapse level satisfied the performance level due to the reduction of shear force and the reinforcement of stiffness. The energy dissipation of PC-BRB was similar in the REC-10 ~ REC-20 analytical models with an eccentricity of 20% or less. REC-25 with an eccentricity of 25% was the largest, and it is judged that it is effective to combine and apply PC-BRB when it has an eccentricity of 25% or more to control the torsional behavior.

Abstract
1. 서론
2. 비틀림 비정형
    2.1 국내 내진설계기준
    2.2 편심율
3. 보강 전 비선형동적해석
    3.1 해석개요
    3.2 해석결과
4. 보강 후 제진성능분석
    4.1 보강방안
    4.2 해석결과
5. 결론
감사의 글
References

• 김유성(정회원, ㈜플러스구조, 박사수료) | Kim Yu-Seong (Plus Structural Engineers & Associates Manager)
• 이준호(서일대학교. 건축공학과 조교수, 공학박사) | Lee Joon-Ho (School of Architecture, Seoil University)
• 김기철(종신회원, 서일대학교 건축공학과 교수) | Kim Gee-Chul (School of Architecture, Seoil University) Corresponding author