According to the recently revised seismic design standards, seismic design of underground structures is required. Concrete underground outer walls are installed separately from temporary earth retaining walls as permanent underground outer walls. This raises issues of constructability, economy, and space narrowness. Therefore, a steel underground continuous wall is developed to promote construction efficiency, safety, and economy by introducing the off-site construction (OSC) method of underground structures. The steel underground continuous wall will be used as a permanent underground continuous wall along with the temporary earth retaining wall. To this end, it must satisfy structural performance equivalent to or higher than the concrete underground outer wall. The integrity and in-plane shear resistance performance between single panel members must be satisfied to be used as a permanent wall. The interlocking effect through geometric bonding is intended to enhance the bonding effect between these members. Therefore, trapezoidal members were developed, and bending performance tests and analyses of each member were performed to confirm the structural bending performance of these members. The bending performance improvement effect of the combined multiple members was confirmed. As a result, it was confirmed that the integration of members and structural performance was improved due to the interlocking effect of the absence of joints. The seismic design analysis of the demonstration site was performed with these developed members, and it was confirmed that the structural performance was equivalent to or higher than that of the existing RC underground continuous wall. As a result, it was confirmed that the steel underground continuous wall can be used as a permanent underground wall together with the temporary earth retaining wall.

A B S T R A C T
1. 서 론
2. 부재 실험 및 해석
    2.1 정방향 단일 사다리꼴 부재의 휨 성능 실험 및 해석
    2.2 부방향 단일 사다리꼴 부재의 휨 성능 실험 및 해석
    2.3 정방향 단일 사다리꼴 내부 소일 시멘트 채움 부재의 휨 성능실험 및 해석
    2.4 인터록킹으로 결합된 복수 부재의 휨성능 평가
3. 사다리꼴 강재지하연속벽의 수치해석
4. 결 론
감사의 글
REFERENCES

• 이재영(공주대학교 건설환경공학과 박사과정, (주)가우리안 수석) | Lee Jae Young (Ph. D. Student, Department of Civil Engineering, Kongju National University/General Manager, Gaurian. Ltd.)
• Hassan Md Mehidi(공주대학교 건설환경공학과 석사)
• 정관우(공주대학교 건설환경공학과 석사과정) | Jeong Gawn Woo (M.E. Student, Department of Civil Engineering, Kongju National University)
• 한신인((주)가우리안 전무) | Han Shin In (Director, Gaurian. Ltd.)
• 정해찬(공주대학교 건설환경공학과 석사과정) | Jeong Hae Chan (M.E. Student, Department of Civil Engineering, Kongju National University)
• 김두기(공주대학교 건설환경공학과 교수) | Kim Doo Kie (Professor, Department of Civil Engineering, Kongju National University) Corresponding author