The Analysis and Field Measurement of Longitudinal Track Forces for Long Railroad Bridges

교량상 궤도축력의 해석 및 실측결과 비교

  • 강기동 (한국고속철도건설공단 건설본부 궤도국) ;
  • 박종방 (한국고속철도건설공단 건설본부 궤도국) ;
  • 김인재 (한국고속철도건설공단 건설본부 궤도국) ;
  • 박대근 (한국고속철도건설공단 건설본부 궤도국)
  • Received : 1994.03.21
  • Published : 1994.07.31

Abstract

The design of railroad bridges differs from road bridges because of the interface between track structure and bridge structure. The track generally consists of Continuous Welded Rail(CWR) which is fixed by fasteners to the sleepers embedded in the ballast. The ballast provides the interface between the track structure and the bridge structure. Large longitudinal forces can develop from the temperature variation in rail and bridge structure. These longitudinal forces are specially important for long bridges because the bridge layout for span length, pier dimensions and arrangement and type of bearings can be governed by these forces. This report provides a comparison of longitudinal track forces determined by analysis and actual measured track forces. In recent practice the longitudinal track force for European railways is analyzed using a finite element analysis method. This method is very time-consuming and requires the detail design of the bridge to be complete. Redesign is required if the design criteria for longitudinal track forces are not satisfied. There is a need to develop a simple analysis method considering the large number of bridge structures and a relatively short design time on the Korean High Speed Rail Project. The analysis results presented herein, based on a simplified analysis, show good agreement with those obtained by finite element analysis, as well as with those measured on an actual track. The proposed analysis method is particularly useful for the preliminary design of bridge structures.

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