한국공간구조학회논문집 (Journal of Korean Association for Spatial Structures)

  • 제20권2호
  • /
  • Pages.77-85
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  • 2020
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  • 1598-4095(pISSN)
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  • 2287-7401(eISSN)
한국공간구조학회 (Korean Association for Spatial Structures)
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비대칭 초기 조건을 갖는 얕은 아치의 동적 불안정과 순시 주파수 변화

Dynamic Instability and Instantaneous Frequency of a Shallow Arch With Asymmetric Initial Conditions

  • 손수덕 (한국기술교육대학교 건축공학과) ;
  • 하준홍 (한국기술교육대학교 교양학부)
  • Shon, Sudeok (Dept. of Architectural Eng., Koreatech University) ;
  • Ha, Junhong (School of Liberal Arts, Koreatech University)
  • 투고 : 2020.04.16
  • 심사 : 2020.04.30
  • 발행 : 2020.06.15
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초록

This paper examined the dynamic instability of a shallow arch according to the response characteristics when nearing critical loads. The frequency changing feathers of the time-domain increasing the loads are analyzed using Fast Fourier Transformation (FFT), while the response signal around the critical loads are analyzed using Hilbert-Huang Transformation (HHT). This study reveals that the models with an arch shape of h = 3 or higher exhibit buckling, which is very sensitive to the asymmetric initial conditions. Also, the critical buckling load increases as the shape increases, with its feather varying depending on the asymmetric initial conditions. Decomposition results show the decrease in predominant frequency before the threshold as the load increases, and the predominant period doubles at the critical level. In the vicinity of the critical level, sections rapidly manifest the displacement increase, with the changes in Instantaneous Frequency (IF) and Instant Energy (IE) becoming apparent.

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참고문헌

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