Extracting Modal Parameters of Railway Bridge under the Action of High-speed Train Using TDD Technique

TDD기법을 이용한 고속철도 교량의 동특성 추출

  • 김병화 (경남대학교 토목공학과)
  • Received : 2008.07.30
  • Accepted : 2008.09.08
  • Published : 2008.12.10

Abstract

When the crossing frequency of a train meets the natural frequency of a railway bridge, the bridge is bound to become resonant. There are few available time response samples involving a train that passes a bridge at high speed. Very effective modal-parameter extraction techniques for such special high-speed railway bridge conditions are introduced in this paper. Utilizing the cross-correlations of the free-vibration responses after the train passes, mode shapes and the temporal modal parameters (e.g., natural frequency and damping ratio) are extracted using the TDD and SI techniques, respectively. This approach has been applied to a two-span steel composite bridge in the Kyung-Bu high-speed railway system. The estimation results were compared with those obtained using the existing methods. The results fully coincide with those that were extracted using the existing aforementioned technique.

Acknowledgement

Supported by : 경남대학교

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