Variation of Natural Frequency and Dynamic Behavior of Railway Open-Steel-Plate-Girder Bridge with Installing Disk Bearings

디스크 받침에 의한 철도 판형교의 고유진동수 및 동적 거동 변화

  • Received : 2006.02.02
  • Accepted : 2006.08.10
  • Published : 2006.08.27

Abstract

Open-steel-plate-girder(OSPG) bridges are one of the most prevalent bridge types among Korean railway bridges. They account for about 40% of all Korean railway bridges. However, the line-type bearings used for OSPG bridges generate several problems with respect to the bridges' dynamic behavior and maintenance. The replacement of the existing bearings with polyurethane disk bearings could be a possible solution to this problem. This type of disk bearing is an elastic bearing using a polyurethane disk. This study estimated the variations in the natural frequency of a bridge when disk bearings were installed and the bridge's dynamic behavior with a running locomotive and running trains. The first natural frequency of the bridge was 3% lower than that of the as-built bridge after the installation of the disk lower, respectively. Also, the second and third frequencies were 7 and 15% lower, respectively. The disk bearings increased the vertical displacement of the bridge, but the pure displacement, excluding the disk deformation, did not vary. The vertical acceleration did not increase when the disk bearing was installed, with trains running. The shear pin in the disk bearing reduced the lateral displacement and the acceleration of the bridge.

Acknowledgement

Supported by : 한국철도기술연구원

References

  1. 김성일, 정원석, 최은수 (2005). '공진소멸 현상을 이용한 기존 선 철도교량의 지간 최적화를 위한 연구,' 한국철도학회 논문집, 제 8권 2호, pp.137-144
  2. 박영훈, 전준창, 박용걸 (2003). '외부 후 긴장 보강공법 적용에 따른 합성형의 동적 거동,' 대한토목학회 논문집, 제 23권 6A호, pp.1165-1173
  3. 박남희, 최진유, 유철수, 강영종 (2000). '강판형교 바닥판 모멘 트의 해석기법,' 한국강구조학회 논문집, 제12권 1호, pp. 17-28
  4. 임성순 (2000). '이동하중을 받는 판형교의 동적 거동에 대한 실 험적 연구,' 한국강구조학회 논문집, 제12권 4호, pp. 407-416
  5. 오세환, 최은수, 정희영 (2005). '철도교용 고무패드의 강성 추 정기법,' 한국강구조확회 논문집, 제 17권, 제 3호, pp. 307-316
  6. 오지택 (2005). 기존선 속도향상에 대비한 판형교의 동적 안정 성 향상 기술 개발 보고서, 한국철도기술연구원
  7. 최은수, 김현민, 오지택, 김성일 (2005). '철도교용 고무패드 설 치에 따른 판형교의 동적 거동 분석,' 한국강구조학회, 17권 3호, pp. 295-306
  8. Clough, R.W. and Penzien, J. (1993). Dynamics of Structures, the second edition, McGraw-Hill, Taipei, Taiwan
  9. EN 1991-2(2003) Eurocode 1 : Actions on structures Part2 : Traffic loads on bridges
  10. ERRI D 214 RP9 (1999). Rail Bridges for speeds>200, pp. 21-24
  11. Yau, J.D., Wu, ,Y.S. and Yang, Y.B. (2001). Impact response of bridges with elastic bearings to moving loads, Journal of Sound and Vibration, 248 (1), pp. 9-30 https://doi.org/10.1006/jsvi.2001.3688
  12. Yang, Y.B., Liao, S.S., and Lin, B.H. (1995). Impact formulas for vehicles moving over simple and continuous beams, ASCE, Journal of Structural Engineering, 121 (11), pp. 1644-1650 https://doi.org/10.1061/(ASCE)0733-9445(1995)121:11(1644)