한국지진공학회논문집 (Journal of the Earthquake Engineering Society of Korea)

  • 제10권6호
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  • Pages.115-123
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  • 2006
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  • 1226-525X(pISSN)
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  • 2234-1099(eISSN)
한국지진공학회 (Earthquake Engineering Society of Korea)
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장기계측에 의한 서해대교 사장교의 동특성 평가

Dynamic Characteristics of Seohae Cable-stayed Bridge Based on Long-term Measurements

  • 박종칠 (한국도로공사 도로교통기술원) ;
  • 박찬민 (한국도로공사 도로교통기술원) ;
  • 김병화 (포항산업과학연구원 강구조연구소) ;
  • 이일근 (한국도로공사 서해대교관리소) ;
  • 조병완 (한양대학교 토목공학과)
  • 발행 : 2006.12.31
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초록

본 논문에서는 구조건전성모니터링(SHM)시스템이 설치된 케이블교량을 대상으로 장기적인 동적거동 특성을 분석하였다. 3차원 유한요소모델을 사용한 모드해석을 통해 모드변수를 추출하였다. 이를 교량에서 측정된 상시진동신호에 대해 주파수영역에서 분석한 고유진동수와 비교하여 정확한 기저모델이 구축되었음을 알 수 있었다. 지난 5년간의 고유진동수와 온도를 통계분석하여 고유진동수가 온도에 선형 반비례하고 있음을 확인하였고, 이러한 온도효과에 대한 평가를 수행하였다. 또한 상시진동신호를 시간영역에서 TDD기법을 적용하여 모드형상을 추출하였으며, 모드해석 결과와의 비교를 통해 케이블교량에 적용이 가능함을 검증하였다.

This paper presents long-term dynamic characteristics of a cable-stayed bridge where installed SHM (Structural Health Monitoring) system. Modal parameters such as natural frequencies and mode shapes are identified by modal analysis using three dimensional finite element model. The developed baseline model has a good correlation with measured natural frequencies identified from field ambient vibrations. By statistical data processing between measured natural frequencies and temperatures, it is demonstrated that the natural frequency is in linearly inverse proportion to the temperature. The estimation of temperature effects against frequency variations is performed. Mode shapes are identified from the TDD (Time Domain Decomposition) technique for ambient vibration measurements. Finally, these results demonstrate that the TDD method can apply to identify modal parameters of a cable-stayed bridge.

키워드

참고문헌

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  2. Augmented Reality (AR)-Based Sensor Location Recognition and Data Visualization Technique for Structural Health Monitoring vol.17, pp.2, 2013, https://doi.org/10.11112/jksmi.2013.17.2.001