KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Development of Slender Aerodynamic Girder for Suspension Bridges

현수교 세장 내풍 단면의 개발

  • Received : 2009.10.26
  • Accepted : 2010.01.22
  • Published : 2010.06.30
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Abstract

This study intends to develop an aerodynamic girder for suspension bridge with width corresponding to 1/70 of the main span length. In the first step of present study, parametric study for the effects of major structural properties on aerodynamic stability of bridges was performed. The span length and natural frequency of bridges were found to be free from girder width, girder height, and aspect ratio of width to height. The empirical equation according to confidence interval was proposed to estimate the natural frequencies of bridges from span length. From the sensitivity analysis, it was revealed that the torsional frequency was dominant parameter among various structural properties that affected flutter velocity mostly. The final aerodynamic bridge section which satisfied the flutter criteria was found from section wind tunnel tests for 30 cross sectional models. The aerodynamic stability of the developed cross section was verified by multimode flutter analysis. The present economical cross section can be used for long span suspension bridge.

본 연구에서는 변장비 70에 가까운 도전적인 현수교 단면을 개발하는데 목적을 두고 있다. 이를 위하여 먼저 강박스 현수교의 제원을 수집 분석하였다. 그 결과를 보면 강박스 현수교에서 경간장과 형상변수(교폭, 형고, 변장비, 고폭비)는 상관관계가 낮았고 고유진동수와 형상변수의 상관관계도 낮은 것으로 나타났으며, 상관관계가 높은 경간장과 고유진동수 관계는 신뢰구간별 추정식을 제시하였다. 그리고 교폭, 진동수비, 질량, 질량관성모멘트, 수직 및 비틈 고유진동수 변화에 따른 플러터 풍속의 민감도 분석을 실시하였는데, 타 변수보다 비틈 고유진동수가 플러터 풍속에 미치는 영향이 가장 큰 것으로 나타났다. 주경간장 1111 m인 현수교의 내풍 단면을 개발하기 위하여 최소 단면폭과 형고를 제약조건으로 하여 총 30개의 단면에 대한 풍동실험을 실시하고, 이로부터 한계풍속 기준을 충분히 만족하는 단면을 찾았다. 그리고 다중모드 플러터 해석으로 개발한 단면의 내풍안정성을 검증하였다. 본 연구에서 제시한 세장 단면은 향후 장대 현수교 설계시 활용할 수 있을 것으로 판단된다.

Keywords

References

  1. 대한토목학회(2006) 케이블강교량설계지침.
  2. 유 신(2009) 보령-태안 연결도로 현수교 설계.
  3. 이승호, 권순덕(2009) 강제 가진에 의한 교량 플러터계수 추출, 한국소음진동공학회 논문집, 한국소음진동공학회, 제19권 제6호.
  4. 日本土木學會(2003) 橋梁の耐風設計 -基準と最近の進步-
  5. 川田忠樹(1987) 現代の弔橋, 理工圖書.
  6. Brancaleoni, F. and Diana, G. (1993) The aerodynamic design of the Messina Straits Bridge, J. of Wind Engineering and Industrial Aerodynamics, Vol. 48, No. 2-3.
  7. Brownjohn, J.M.W., Bocciolone, M., Curami, A., Falco, M., and Zasso, A. (1994) Humber bridge full-scale measurement campaigns 1990-1991, J. of Wind Engineering and Industrial Aerodynamics, Vol. 52.
  8. Chowdhury, A. and Sarkar, P.P. (2003) A new technique for identification of eighteen flutter derivatives using a three-degree-of-freedom section model, Engineering Structures, Vol. 25, No. 14.
  9. Ge, Y.J. and Tanaka, H. (2000) Aerodynamic flutter analysis of cable-supported bridges by multi-mode and full-mode approaches, J. of Wind Engineering and Industrial Aerodynamics, Vol. 86.
  10. Ge, Y.J. and Xiang, H.F. (2008) Recent development of bridge aerodynamics in China, J. of Wind Engineering and Industrial Aerodynamics, Vol. 96, No. 6-7.
  11. Gimsing, N.J. (1997) Cable Supported Bridges, John Wiley & Sons.
  12. Hui, M.C.H. and Karsen, A. (2002) Aerodynamic investigation for the deck of Stonecutter Bridge emphasizing Reynolds number effects, The 2nd International Symposium on Wind and Structures, Busan.
  13. Jain, A., Jones, N.P., and Scanlan, R.H. (1996) Coupled flutter and buffeting analysis of long-span bridges, J. of Structural Engineering, ASCE, Vol. 122, No. 7.
  14. Kwon, S.D., Lee, S.H., Uejima, H., and Lee, M.J. (2008) Wind resistance design of Kwangyang Bridge, Bridge Maintance, Safety, Management, Health Monitoring and Informatics, CRC Press.
  15. Miyata, T., Yokoyama, K., Yasuda, M., and Hikami, Y. (1992) Akashi Kaikyo Bridge: Wind effects and gull model wind tunnel tests, Aerodynamics of Large Bridges, Balkema.
  16. Reinhold, T.A., Brinch, M., and Damsgaard, A. (1992) Wind tunnel tests for the Great Belt link, Aerodynamics of Large Bridges, Balkema.
  17. Simiu, E. and Scanlan, R.H, Wind Effects on Structures, Wiley, 1996.
  18. Strommen, E.N. (2005) Theory of Bridge Aerodynamics, Springer.
  19. Wardlaw, R.L. (1990) Wind effects on bridges, J. of Wind Engineering and Industrial Aerodynamics, Vol. 33, No. 1-2.
  20. Xu, Y.L., Sun, D.K., Ko, J.M., and Lin, J.H. (2000) Fully coupled buffeting analysis of Tsing Ma suspension bridge, J. of Wind Engineering and Industrial Aerodynamics, Vol. 85.