This paper is concerned with an experimental research to control of random vibration caused by external loads specially in cable-stayed bridges which tend to be structurally flexible. For the vibration control, we produced a model structure modelled on Seohae Grand Bridge, and we designed a shear type MR damper. On the center of its middle span, we placed a shear type MR damper which was to control its vibration and also acquire its structural responses such as displacement and acceleration at the same site. The experiments concerning controlling vibration were performed according to a variety of theories including un-control, passive on/off control, and clipped-optimal control. Its control performance was evaluated in terms of the absolute maximum displacements, RMS displacements, the absolute maximum accelerations, RMS accelerations, and the total power required to control the bridge which differ from each different experiment method. Among all the methods applied in this paper, clipped-optimal control method turned out to be the most effective to reduces of displacements, accelerations, and external power. Finally, It is proven that the clipped-optimal control method was effective and useful in the vibration control employing a semi-active devices such MR damper.

1. 서 론
2. 준능동형 진동 제어장치
3. 준능동 제어법칙 및 제어성능평가 지수
4. 사장교 모델의 FE 모델링 및 모달 실험
5. 사장교 모델의 진동제어
6. 진동제어 성능평가
7. 결 론
/ 감사의 글 /
/ REFERENCES /

• 허광희(건양대학교 토목공학과) | Heo, Gwanghee
• 전준용(건양대학교 토목공학과) | Jeon, Joonryong Corresponding author
• 전승곤(충남대학교 토목공학과) | Jeon, Seunggon