Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
권호 표지
DOI QR코드

DOI QR Code

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

장기계측에 의한 서해대교 사장교의 동특성 평가

  • 박종칠 (한국도로공사 도로교통기술원) ;
  • 박찬민 (한국도로공사 도로교통기술원) ;
  • 김병화 (포항산업과학연구원 강구조연구소) ;
  • 이일근 (한국도로공사 서해대교관리소) ;
  • 조병완 (한양대학교 토목공학과)
  • Published : 2006.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

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.

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.

Keywords

References

  1. Wenzel, H. and Pichler, D., Ambient vibration monitoring, John Wiley & Sons, England, 2005, 291pp
  2. Chang, C. C., Chang, T. Y. P. and Zhang, Q. W., 'Ambient vibration of long-span cable-stayed bridge,' Journal of Bridge Engineering, ASCE, Vol. 6, No. 1, 2001, pp. 46-53 https://doi.org/10.1061/(ASCE)1084-0702(2001)6:1(46)
  3. Cunha, A., Caetano, E. and Delgado, R., 'Dynamic tests on large cable-stayed bridge,' Journal of Bridge Engineering, ASCE, Vol. 6, No. 1, 2001, pp. 54-62 https://doi.org/10.1061/(ASCE)1084-0702(2001)6:1(54)
  4. Abdel-Ghaffer, A. M. and Scanlan, R H., 'Ambient vibration studies of Golden Gate Bridge. 1: Suspended structure,' Journal of Engineering Mechanics, ASCE, Vol. 111, No. 4, 1985, pp. 463-482 https://doi.org/10.1061/(ASCE)0733-9399(1985)111:4(463)
  5. Xu, Y. L., Ko, J. M. and Zhang, W. S., 'Vibration studies of Tsing Ma Suspension Bridge,' Journal of Bridge Engineering, ASCE, Vol. 2, No.4, 1997, pp. 149-156 https://doi.org/10.1061/(ASCE)1084-0702(1997)2:4(149)
  6. 정대성, 김철영, 김남식, 윤자걸, '상시진동실힘을 이용한 남해대교의 동특성 평가',, 대한토목학회논문집, 제 22권, 제 6-A 호,2002, pp. 1501-1514
  7. Ren, W. X., Peng, X. L. and Lin, Y. Q., 'Experimental and analytical studies on dynamic characteristics of a large span cable-stayed bridge,' Journal of Engineering Structures, Vol. 27, No.4, 2005, pp. 535-548 https://doi.org/10.1016/j.engstruct.2004.11.013
  8. Felber, A. J. and Cantieni, R., Introduction of a new ambient vibration testing system: Description of the system and seven bridge tests, EMPA, Switzerland, 154pp
  9. Kim, B. H., Stubbs, N. and Park, T., 'A new method to extract modal parameters using output-only responses,' Journal of sound and vibration, Vol. 282, 2005, pp. 215-230 https://doi.org/10.1016/j.jsv.2004.02.026
  10. 대림산업(주), '서해대교 해석모델 구축 및 초기재하시험에 의한 모델개선', 보고서, 한국도로공사,2001
  11. Peeters, B., Maeck, J. and Roeck, G. D., 'Vibration-based damage detection in civil engineering: excitation sources and temperature effects,' Smart Materials and Structures, Vol. 10, No.3, 2001, pp. 518-527 https://doi.org/10.1088/0964-1726/10/3/314
  12. Macdonald, J. H. G. and Daniel, W. E., 'Variation of modal parameters of a cable-stayed bridge identified from ambient vibration measurements and FE modelling,' Journal of Engineering Structures, Vol. 27, No. 13, 2005, pp. 1916-1930 https://doi.org/10.1016/j.engstruct.2005.06.007
  13. Xia, Y., Hao, H., Zanardo, G. and Deeks, A., 'Long term vibration monitoring of RC slab: Temperature and humidity effect,' Journal of Engineering Structures, Vol. 28, No.3, 2006, pp. 441-452 https://doi.org/10.1016/j.engstruct.2005.09.001
  14. Blevins, R. D., Formulas for Natural Frequency and Mode Shape, Krieger Publishing Co., Florida, 2001, 492pp
  15. Bangash, M. Y. H., Concrete and Concrete Structures, Elsevier, New York, 1989, 668pp

Cited by

  1. A Modal Testing of Large Naval Vessel Using Main Gun Firing Test vol.12, pp.1, 2011, https://doi.org/10.5762/KAIS.2011.12.1.001
  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