Restraints of Branch Lines are used as earthquake-resistant support devices for fire-fighting pipes along with sway brace devices. The central types are aligned and fixed in a straight line with center of the pipe, but the eccentric types are fixed to on side of the pipe, so a bending moment occurs. In this study, three specimens each of central type and eccentric type were installed at an angle of 45° from the vertical and a monotonic compression load of 1340N was applied. All central type samples satisfied 17.8mm of the allowable displacement, but all eccentric type samples failed to meet the target load and buckled. Therefore, when considering the performance of eccentric type restraints, both compressive load and bending moment must be considered. Even through material mechanics calculations, the yield stress of eccentric type - 3/8 inch all threaded steel bolt - exceeds 320Mpa of the allowable stress. A experiment standards need to be established for eccentric type restraints.

1. 서 론
2. 실험
    2.1 실험 방법
    2.2 실험체 계획
3. 실험 결과
    3.1 좌굴 양상
    3.2 최대 하중
    3.3 압축하중 평가
4. 편심방식 고정장치 압축하중 계산
5. 결론
6. References

• 오창수(우석대학교 일반대학원 소방,안전공학과 박사수료) | Changsoo Oh (Ph.D, Candidate, Fire·Safety Engineering, Woosuk University)
• 김지훈((주)양수금속) | Jihoon Kim (YangSoo Metals Co.,Ltd)
• 공하성(우석대학교 소방방재학과 교수) | Hasung Kong (Professor, Department of Fire and Disaster Prevention, Woosuk University) Corresponding author