중심가새골조의 내진성능향상을 위한 휨항복댐퍼의 개발
Development of a Flexure Yielding Steel Damper for Concentrically Braced Frames
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초록
본 논문에서는 휨 항복 메커니즘을 기반으로 한 강재이력 댐퍼를 제안하기 위한 해석 및 실험적 연구를 수행하였다. 댐퍼는 휨모멘트에 의한 항복거동을 하도록 설계된 일련의 댐핑 플레이트로 구성된다. 실험 결과와 유한요소해석 결과의 비교를 통해서 본 연구에서 채택된 해석적 접근방식이 댐핑 플레이트의 형태 및 상세에 대한 민감도 연구를 수행하기에 적절함을 확인하였다. 최초에 제안된댐퍼는 휨 항복 메커니즘을 기반으로 작동하는 것으로 고안되었으나, 댐핑 플레이트의 인장 거동에 대한 기여도가 상당할 수 있음을관찰할 수 있었다. 댐핑 플레이트의 두께가 증가함에 따라 휨 항복에 의한 에너지 흡수량이 증가한다. 댐핑 플레이트의 두께가 감소함에 따라 인장에 의한 댐퍼의 비선형 거동 기여도가 증가하고 좌굴 발생으로 인하여 이력곡선의 형상이 댐퍼로서 불리해진다.
Abstract
This paper details the analytical and experimental studies performed to propose a steel damper based on the flexural yielding mechanism. The damper is composed of a set of damping plates that are designed to yield in flexure. The comparison of experimental and finite element analysis results indicate that the analytical approach adopted in this study should be appropriate to perform sensitivity studies on the geometries of the damping plates. Although the damper is originally proposed to work based on the flexural mechanism, it is observed that the contribution of the tensile behavior of the damping plate could be considerable. As the thickness of the damping plate increases, the plastic energy due to the flexural yield increases. As the thickness of the damping plate decreases, the contribution of the tensile behavior increases,and the shape of the hysteresis loop distorts.
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