KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Seismic Performance of MR Fluid Dampers in Base-Isolated Structures

기초격리된 구조물에서 자기유동성 유체감쇠기의 면진성능

Doh, Hark-Yong;Lee, Jong-Seh
도학용;이종세

  • Published : 2003.03.31

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Abstract

The design concepts using vibration reduction techniques, or structural control, have become popular recently as a means to protect infrastructure against earthquakes. The magneto-rheological (MR) fluid damper is one of the most promising new devices for structural vibration reduction because of its mechanical simplicity, high dynamic range, low power requirement, large force capacity and robustness. In this study, the seismic performance of MR devices are compared with that of NZ systems as an attempt to provide some data for improving seismic design techniques applied to structures. A six-story building model is considered as a numerical example and nonlinear time domain analysis is performed on the base isolation system. The ground acceleration data of El Centre 1940, Mexico City 1985 and Kobe 1995 earthquakes are used as seismic excitations. The results show that MR damper systems outperform NZ systems in wide-ranging seismic excitations with respect to intensity and period characteristics.

사회기반 시설을 지진재해로부터 보호하기 위하여 최근 제진설계 개념이 사용되고 있다. MR 유체감쇠기는 구조물의 진동을 감소시키기 위한 새로운 제진장치로서 기계적인 단순성, 높은 동적범위, 작은 전력요구량, 큰 감쇠능력, 강인성 등의 장점으로 인해 토목구조물에의 적용에 많은 가능성을 보이고 있다. 본 연구에서는 기초격리장치로서 작용하는 MR 유체감쇠기를 기존의 NZ 시스템과의 비교?검증을 통해 면진구조물 설계기법 개선의 기초자료로 제시하였다. 수치 예제를 통한 기초격리시스템의 비선형 시간영역해석을 위해 6층의 프레임구조물을 대상으로 하였고, El Centro 1940지진, Mexico City 1985 지진, Kobe 1995 지진의 지반가속도 데이터를 지진강도별, 주기특성별 입력지진동으로 하였다. 해석결과, MR 유체감쇠기 모델은 광범위한 입력지진에 대해 우수한 면진성능을 발휘함을 확인할 수 있었다.

Keywords

References

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