Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Numerical Analysis for Dynamic Characteristics of Next-Generation High-Speed Railway Bridge

차세대 고속철 통과 교량의 동적특성에 대한 수치해석

  • Received : 2021.11.23
  • Accepted : 2021.12.23
  • Published : 2022.04.30
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Abstract

To take into account of the increasing speed of next generation high-speed trains, a new design code for the traffic safety of railway bridges is required. To solve dynamic responses of the bridge, this research offers a numerical analyses of PSC (Pre-stressed Concrete) box girder bridge, which is most representative of all the bridges on Gyungbu high-speed train line. This model takes into account of the inertial mass forces by the 38-degree-of-freedom and interaction forces as well as track irregularities. Our numerical analyses analyze the maximum vertical deflection and DAF (Dynamic Amplification Factor) between simple span and two-span continuous bridges to show the dynamic stability of the bridge. The third-order polynomial regression equations we use predict the maximum vertical deflections depending on varying running speeds of the train. We also compare the vertical deflections at several cross-sectional positions to check the influence of running speeds and the maximum irregularity at a longitudinal level. Moreover, our model analyzes the influence lines of vertical deflection accelerations of the bridge to evaluate traffic safety.

차세대 고속철은 주행 속도가 점점 증가하므로 이를 반영한 고속철 차량 통과교량에 대한 새로운 주행 안정성의 평가가 요구된다. 이를 위하여 현재 공용 중인 경부 고속철 구간의 대표 교량형식인 PSC (Pre-stressed Concrete) 박스거더 교량을 대상으로 관성질량을 고려한 38-자유도 차량과 궤도 불규칙성과 상호 작용력을 반영하여 모형화하였으며, 고속철 차량 주행속도 별로 동적 수치해석을 수행하여 주행 안정성을 평가하였다. 수치해석을 통해 단순교와 2 경간 연속교의 최대 수직 변위와 DAF (Dynamic Amplification Factor; 동적확대계수)를 산출하여 동적 안정성 여부를 판단하였으며, 또한 주행 속도 별 최대 수직 변위를 추정하기 위한 3차 다항 회귀 분석식을 제안하였다. 대표적인 주행 속도와 횡 단면 위치 별 수직 변위 차이를 비교하고, 종 방향 최대 면틀림을 분석하였다. 또한, 고속철 차량의 교량통과 중 교량의 수직변위에 대한 가속도 영향선과 각 항목 간의 연관성을 분석하여 주행 안정성을 평가하였다.

Keywords

Acknowledgement

이 연구는 2021년 정부재원으로 한국연구재단 중견연구 NRF-2021R1A2C1010762 과제지원을 받아 수행된 기초연구사업임.

References

  1. Kim, S. I. (2000) Bridge-train Interaction Analysis of High-Speed Railway Bridges. Ph.D. Thesis, Seoul National University.
  2. Oh, S. T. and Jeong, B. J. (2021) A Study of Dynamic Response of PSC box 2 span continuous Bridge by Next Generation Railway. Proceeding of Korea Concrete Institute, 33(1), 265-266, (in Korean).
  3. Oh, S. T., and Lee, D. J. (2014) A Dynamic Analysis of Rotations at the center of Vehicle Running High-speed KTX Train on the PSC Box Bridges, Journal of the Korea Institute for Structural Maintenance and Inspection, 18(1), 59~67, (in Korean). https://doi.org/10.11112/JKSMI.2014.18.1.059
  4. Oh, S. T., Lee, D. J., Jeong, B. J., Park, J. Y., and Moon, D. J. (2021) Train Wheel Force Analysis by Dynamic Analysis of High-speed Train Bridge. International Journal of Engineering and Innovative Technology (IJEIT), 10(11), 1-6.
  5. Oh, S. T., Lee, D. J., Jun, S. M., and Jeong, S. H. (2016) A Long-Term Friction Test of Bridge Bearings Considering Running Speed of Next Generation Train, Journal of the Korea Institute for Structural Maintenance and Inspection, 20(2), 34~39, (in Korean). https://doi.org/10.11112/JKSMI.2016.20.2.034
  6. Oh, S. T., Lee, D. J., Shim, Y. W., and Yun, J. K. (2011) A Dynamic Analysis of PSC Box Bridge Varying Span Lengths for Increased Speeds of KTX, Journal of the Korea Institute for Structural Maintenance and Inspection, 15(4), 204~211, (in Korean). https://doi.org/10.11112/JKSMI.2011.15.4.204
  7. Oh, S. T., Shim, Y. W., and Lee, D. J. (2010) Dynamic Analysis of PSC Bridge for a High Speed Railway Vehicle Using Improved 38-Degree of Freedom Model. Journal of the Korea Concrete Institute, 22(6), 797-803, (in Korean). https://doi.org/10.4334/JKCI.2010.22.6.797
  8. Park, H. S. (1999) Dynamic Analysis of Bridges Using Advanced High-speed Railway Vehicle Models. Ph.D. Thesis, Seoul National University, (in Korean).
  9. Shim, Y. W. (2012) An Interface Study of Dynamic Behaviour on High-speed Train Vehicle/Track/PSC bridge. Ph.D. Thesis, Seoul National University of Science and Technology, Graduate School of Railroad, (in Korean).