KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Passive Control System for Mitigation of Cable Vibration in Cable-Stayed Bridges

사장교의 케이블 진동저감을 위한 수동 제어시스템

  • 황인호 (한양대학교 토목환경공학과) ;
  • 이종세 (한양대학교 토목환경공학과)
  • Received : 2006.04.06
  • Accepted : 2006.06.22
  • Published : 2006.09.30
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Abstract

Rain-wind induced cable vibration can cause serious problems in cable-stayed bridges. Externally attached dampers have been used to provide an effective means to suppress the vibration of relatively short stay-cables. For very long stay-cables, however, such damper systems are rendered ineffective, as the dampers need to be attached near the end of cables for aesthetic reasons. This paper investigates a new control system to mitigate the cable vibration. The proposed control system which consists of a laminated rubber bearing and an internal damper may be installed inside of the cable anchorage. A simple analytical model of the cable-damper system is developed first based on the taut string representation of the cable. The response of a cable with the proposed control system is obtained and then compared to those of the cable with and without an external passive damper. The proposed stay-cable vibration control system is shown to perform better than the optimal passive viscous damper, thereby demonstrating its applicability in large cable-stayed bridges for mitigation of rain-wind induced vibration of stay-cables.

사장교 케이블은 구조적으로 휨강성과 감쇠력이 작아 풍우에 의해 쉽게 유해진동이 발생한다. 이러한 풍우진동을 저감시키기 위한 효과적인 방법으로 부가댐퍼를 장착하여 케이블의 감쇠력을 증가시키는 제어시스템이 널리 사용되어왔다. 그러나 사장교의 장대화로 인해 구조적으로나 미적으로 충분한 감쇠력을 제공할 수 있는 위치에 부가댐퍼를 장착하기 어렵게 되었다. 그러므로 본 논문은 사장교의 미관을 해치지 않으면서 기존의 제어시스템보다 효과적으로 케이블의 진동을 저감시킬 수 있는 새로운 개념의 제어시스템을 제안하였다. 제안된 시스템은 케이블 앵커리지에 적층고무베어링과 같은 유동이 가능한 장치와 내부댐퍼로 구성되었으며, 제어성능평가를 위해 해석모델을 개발하였다. 제안된 시스템의 제어성능 분석을 위해 수치해석을 수행하였으며 기존의 부가 댐퍼시스템과 진동 저감효과를 비교하였다. 제안된 제어시스템은 기존의 부가댐퍼 시스템 보다 효과적으로 진동을 저감시킬 수 있었으며 사장교 케이블의 풍우진동 저감을 위해 효과적인 시스템으로 사료된다.

Keywords

References

  1. Endo, T., Iijima, T., Okukawa, A., and Ito, M. (1991) The technical challenge of a long cable-stayed bridge: tatara bridge. Cablestayed Bridges: Recent Developments and Their Future, Elsevier, pp. 417-436
  2. Irvine, H.M. (1981) Cable Structures, MIT Press, Cambridge, Mass
  3. Johnson, E.A., Spencer, B.F., Jr., and Fujino, Y. (1999) Semiactive damping of stay cables: a preliminary study. Proc. 17th Int. Modal Analysis Conf., Society for Experimental Mechanics, Inc., Bethel, Conn., pp. 417-423
  4. Kovacs, I. (1982) Zur Frage der Seilschwingungen und der Seildampfung. Die Bautechnik, 10, pp. 325-332, (in German)
  5. Krenk, S. (2000) Vibrations of a taut cable with an external damper. J. Applied Mech., ASME, 67, pp. 772-776 https://doi.org/10.1115/1.1322037
  6. Main, J.A. and Jones, N.P. (1999) Full-Scale measurements of stay cable vibration. In Larsen, Larose, and Livesey (eds.), Wind Eng. into the 21st Century. Balkema, Rotterdam, pp. 963-970
  7. Main, J.A. and Jones, N.P. (2002) Free Vibrations of Taut Cable with Attached Damper. I: Linear Viscous Damper. J. Eng. Mech., Vol. 128, No. 10, pp. 1062-1071 https://doi.org/10.1061/(ASCE)0733-9399(2002)128:10(1062)
  8. Naeim, F., and Kelly, J.M. (1999) Design of Seismic isolation Structures, John Wiley & Sons, Inc. New York
  9. Pacheco, B.M., Fujino, Y., and Sulekh, A. (1993) Estimation curve for modal damping in stay cables with viscous damper. J. Struct. Eng., ASCE, Vol. 119, No. 6, pp. 1961-1979 https://doi.org/10.1061/(ASCE)0733-9445(1993)119:6(1961)
  10. Russell, H. (1999) Hong kong bids for cable-stayed bridge record. Bridge Design and Engineering, No. 15 (second quarter), 7
  11. Virloguex, M., et al. (1994) Design of the normandie bridge. Proc. Int. Conf. Cable-stayed and Suspension Bridges, IABSE, 1. pp. 605-630
  12. Watson, S.C. and Stafford, D. (1988) Cables in trouble. Civil Eng., ASCE, Vol. 58, No. 4, pp. 38-41