Experimental Evaluation for Damping Ratio Limit of Railway Bridge according to Structure Types

철도교량 구조형식별 감쇠비 하한값 산정을 위한 시험적 연구

  • 민낙기 (서울과학기술대학교 철도전문대학원) ;
  • 성덕룡 (대원대학교 철도건설과) ;
  • 박용걸 (서울과학기술대학교 철도전문대학원)
  • Received : 2012.01.06
  • Accepted : 2012.02.27
  • Published : 2012.04.30


The damping ratio of railway bridge has become one of the most important issues in dynamic design and dynamic stability of railway bridge. In the present study, laboratory and field test were performed for railway bridges such as a twin I-shaped steel composite girder, PSC box, steel box, PSC, IPC, PRECOM, preflex. The damping ratio of railway bridge according to structure types was estimated by logarithmic decrement method. Therefore, magnitude, frequency and amplitude of load did not affect damping ratio of railway bridge. Also, damping ratio limit of steel composite and PSC bridges was evaluated in 1.0%.


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