This study explores the seismic performance of steel diaphragm walls in underground structures, a critical aspect of structural engineering. The study focuses on the effects of slab diaphragm flexibility, an often overlooked factor in seismic design. Traditional seismic designs often assume the slab acts as a rigid diaphragm, leading to inaccuracies in predicting how forces are distributed between the slab and walls during an earthquake. To address this, the authors model steel diaphragm walls using equivalent cross-sections and analyze shear forces in both rigid and semi-rigid diaphragm scenarios. Results show that semi-rigid diaphragms reduce the shear forces on the exterior walls while increasing them on the internal core, thereby affecting the overall stiffness of the structure. The study emphasizes the importance of considering diaphragm flexibility in seismic design to achieve more accurate predictions of structural behavior and improve construction efficiency.

A B S T R A C T
1. 서 론
2. 수치해석모델
    2.1 강재지중연속벽 해석을 위한 등가 단면
    2.2 요소 설정
    2.3 지진하중에 의한 면내 전단력 계산 방법
    2.4 슬래브의 격막 효과 고려 방법
3. 해석에 대한 결과 및 분석
    3.1 Diaphragm에 따른 거동 형상
    3.2 지하 외벽의 변형성능 평가
    3.3 지하 외벽과 내부 코어의 전단력 비교
    3.4 면외 강성 평가
4. 결 론
감사의 글
REFERENCES

• 정관우(공주대학교 건설환경공학과 석사과정) | Jeong Gwan woo (M.E. Student, Department of Civil Engineering, Kongju National University) Corresponding author
• 이재영((주)가우리안 수석, 공주대학교 건설환경공학과 박사과정) | Lee Jae Young (Ph.D. Student, Department of Civil Engineering, Kongju National University/General Manager, Gaurian. Ltd.)
• Turja Sudeep Das(공주대학교 건설환경공학과 석사과정)
• 한신인((주)가우리안 전무) | Han Shin In (Director, Gaurian. Ltd.)
• 김두기(공주대학교 건설환경공학과 교수) | Kim Doo Kie (Professor, Department of Civil Engineering, Kongju National University)