Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Inelastic Seismic Response of Asymmetric-Plan Self-Centering Energy Dissipative Braced Frames

비정형 셀프센터링 가새골조의 비탄성 지진응답

  • 김진구 (성균관대학교 건축공학과) ;
  • ;
  • 최현훈 (성균관대학교 건축공학과)
  • Published : 2008.08.31
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Abstract

A self-centering energy-dissipative(SCED) bracing system has recently been developed as a new seismic force resistant bracing system. The advantage of the SCED brace system is that, unlike other comparable advanced bracing systems that dissipate energy such as the buckling restrained brace(BRB) system, it has a self-centering capability that reduces or eliminates residual building deformations after major seismic events. In order to investigate the effects of torsion on the SCED brace and BRB systems, nonlinear time history analyses were used to compare the responses of 3D model structures with three different amounts of frame eccentricity. The results of the analysis showed that the interstory drifts of SCED braced frames are more uniform than those of BRB frames, without regard to irregularity. The residual drift and residual rotation responses tended to decrease as irregularity increased. For medium-rise structures, the drift concentration factors(DCFs) for SCED systems were lower than those for BRB frames. This means that SCED-braced frames deform in a more uniform manner with respect to building height. The effect of the torsional irregularity on the magnitude of the DCFs was small.

최근 새로운 지진하중 저항시스템으로 셀프센터링(SCED) 가새 시스템이 개발되었다. 진보된 가새 시스템인 비좌굴 가새(BRB) 시스템과는 달리 큰 지진이 발생한 후 구조물의 잔류 변형을 줄이거나 없앨 수 있는 셀프센터링 능력은 SCED 가새 시스템의 장점이다. 본 논문에서는 SCED 가새와 BRB 가새 시스템의 거동에 비틀림의 영향을 조사하기 위하여 세 가지 다른 편심을 가진 3차원 구조물의 응답을 비선형 동적해석을 수행하여 비교하였다. 해석결과에 따르면 층간변위의 높이방향의 변화는 비정형성에 관계없이 SCED 가새골조의 응답이 BRB 가새골조보다 일정하였으며, 잔류 층간변위와 잔류 회전 응답은 비정형성이 증가함에 따라 감소하였다. 중층 구조물에서 SCED 가새골조의 변형집중계수(DCF)는 BRB 가새골조보다 작은 것으로 나타났다. 이것은 SCED 가새골조가 건물 높이에 따라 보다 일정하게 변형함을 의미한다. DCF의 크기에 대한 비틀림 비정형의 효과는 작았다.

Keywords

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