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고속철도 교량의 현장실험 및 감쇠비 개선에 따른 공진 시 동적응답의 분석

Field Tests and Resonance Behavior Corresponding to the Damping Ratio of a High Speed Railroad Bridge

  • Kim, Sungil (Advanced Infrastructure Team, Korea Railroad Research Institute) ;
  • Kim, Hyunmin (Advanced Infrastructure Team, Korea Railroad Research Institute) ;
  • Park, Donguk (Seismic Simulation Test Center, Pusan National University Pusan National University Yangsan Campus)
  • 투고 : 2013.05.21
  • 심사 : 2013.07.26
  • 발행 : 2013.08.31

초록

고속철도 교량에서는 상업 운행 중에는 대부분 통과속도가 일정하여 속도별 동적 거동에 대한 실험적 계측 및 분석이 불가능하다. 경부고속철도 2단계 개통 전 시운전 시 KTX 열차의 속도별 시운전이 가능하였으며, 속도별 운행에 대한 교량의 동적응답 계측이 가능하였다. 이 계측 결과는 개발된 교량/열차 상호작용해석에 대한 검증 및 비교 분석으로 연계될 수 있었다. 대부분의 속도대역에서 해석과 실험에 의한 결과가 잘 일치함을 알 수 있었으나, 공진이 발생하는 임계속도 부근 주행에서는 상대적으로 큰 응답 차이가 발생하였다. 본 논문에서는 이에 대한 원인 분석을 수행하였으며, 공진 발생 시 감쇠비 값을 측정 시 응답을 통해 재추정한 결과를 반영한 재해석을 수행하였다.

In general, it is difficult to measure dynamic responses of a bridge with stepwise increasing speed of a train during commercial service on a high speed railroad. However, before opening the 2nd stage of the Gyeongbu high speed railroad, there was an opportunity for field tests and measurements of the bridge with stepwise increasing speed(from 170km/ h to 315km/h). The measured responses were compared with the results of a developed bridge/train interaction analysis. Although good agreement was found throughout almost the entire range of speeds, relatively large differences were found in the vicinity of the critical speed at which resonance behavior of the bridge occurs. To investigate the cause of this, reanalyses are performed with re-estimated damping ratios from field tests.

키워드

참고문헌

  1. S.I. Kim, D.S. Kim (2011) Traffic safety and passenger comfort of a suspension bridge considering seismic loads, Journal of the Korean Society for Railway, 14(1), pp. 57-65. https://doi.org/10.7782/JKSR.2011.14.1.57
  2. Eurocode (2006) "Actions on Structures : General actions - Traffic loads on bridges", Eurocode 1 Part 2, European Committee for Standardization.
  3. Korea Rail Network Authority (2011) "Railway Design Standard (Infrastructure)".
  4. D.U. Park, N.S. Kim, S.I. Kim (2009) Damping estimation of railway bridges using extended kalman filter, Journal of the Korean Society for Noise and Vibration Engineering, 9(3), pp. 294-300. https://doi.org/10.5050/KSNVN.2009.19.3.294

피인용 문헌

  1. Analysis of Modal Parameter Estimation Methods for Structural Integrity Monitoring of a Railroad Bridge vol.15, pp.1, 2015, https://doi.org/10.9798/KOSHAM.2015.15.1.243