Many piping systems installed in the power plant are directly related to the safety and operation of the plant. Various dampers have been applied to the piping system to reduce the damage caused by earthquakes. In order to reduce the vibration of the piping system, this study developed a steel coil damper (SCD) with a straightforward structure but excellent damping performance. SCD reduces the vibration of the objective structure by hysteretic damping. The new SCD damper can be applied to high-temperature environments since it consists of steel members. The paper introduces a design method for the elastoplastic coil spring, which is the critical element of SCD. The practical applicability of the design procedure was validated by comparing the nonlinear force-displacement curves calculated by design equations with the results obtained from nonlinear finite element analysis and repeated loading test. It was found that the designed SCD’s have a damping ratio higher than 25%. In addition, this study performed a set of seismic tests using a shaking table with an existing piping system to verify the vibration control capacity on the piping system by SCD. Test results prove that the SCD can effectively control the displacement vibration of the piping system up to 80%.

A B S T R A C T
1. 서 론
2. SCD의 설계
    2.1 구조 형상
    2.2 SCD의 비선형 강성
    2.3 SCD 설계 절차
3. 진동제어 배관시스템 시험체 제작
    3.1 배관시스템
    3.2 SCD 장치
    3.3 반복하중 해석
    3.4 반복가력시험
4. 배관시스템의 진동대시험
    4.1 시험 계획
    4.2 시험체 설치
    4.3 공진탐색시험
    4.4 지진입력운동
    4.5 지진응답
5. 결 론
REFERENCES

• 최송이(이노스기술(주)) | Choi Song Yi (Innose Tech)
• 소기환(이노스기술(주)) | So Gi Hwan (Innose Tech)
• 조성국(이노스기술(주)) | Cho Sung Gook (Innose Tech) Corresponding author