프리스트레스트 철계 형상기억합금을 이용한 하이브리드 댐퍼의 내진성능 해석연구 = Preliminary Study on Seismic Performance of a Hybrid Damper with Prestressed Iron-based Shape Memory Alloy

다국어 초록 (Multilingual Abstract)

This paper analytically explores the applicability of a novel hybrid damper, which incorporates prestressed iron-based shape memory alloy (Fe-SMA) into a conventional hysteretic damper. The hybrid damper aims to dissipate energy as well as reduce residual drift of moment frames subject to strong ground motions. The behavior of each component of the hybrid damper is numerically modeled in OpenSees, and a series of time history analyses is performed for three types of 2D braced steel frames. The results of the analyses reveal that the proposed damper showed greater performance in reducing the maximum and residual drifts of the steel frame. Fe-SMA used in this study costs only 5%–10% of conventional nickel–titanium (Ni–Ti) SMA but is promising as an effective retrofitting method for seismically vulnerable frame structures.

국문 초록 (Abstract)

본 연구는 기존 이력댐퍼와 프리스트레트 철계 형상기억합금(Fe SMA)을 결합한 새로운 하이브리드 댐퍼를 제안하고이용가능성을 해석적으로 평가한다. 하이브리드 댐퍼는 강진 발생 시 모멘트 프레임의 에너지소산능력을 향상시키고 잔류변형을 감소시키기 위한 목적으로 제안되었다. 구조해석 프로그램인 OpenSees를 통해 댐퍼의 각 요소에 대한 해석모델을 구축하였고, 세가지 형식의 강재 가새프레임에 대해 시간이력해석을 수행하였다. 해석결과, 제안된 댐퍼는 모멘트 프레임의 최대 및 잔류변형을 줄이는데 우수한 것으로 나타났다. 본 연구에 사용된 Fe SMA는 니켈-티타늄(Ni-Ti) 형상기억합금에 비해 5-10%에 해당하는 낮은 재료 비용을 가지면서도 지진에 취약한 프레임 구조의 내진보강에 효과적인 결과를 보였다.

참고문헌 (Reference)

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