Abstract
Since high-speed railway bridges are subjected to cyclic loading by the continuous wheel loads traveling at high speed and regular spacing, their dynamic behavior is of extreme importance and has significant influence on the riding safety of the trains. To secure the riding safety of the trains, advanced railway countries have limited the vertical acceleration of the bridge slab below critical values at specific frequency domains. Since these limitations of the vertical acceleration constitute the most important factors in securing the dynamic safety of the bridges, these countries have opted for a conservative approach. However, the Korean specifications limit only the size of the peak acceleration without considering the frequency domain, which impede significantly rational evaluation of the high-speed railway bridges in Korea. In addition, the evaluation of the acceleration without consideration of the frequency domain is the cause of disagreement between the dynamic analysis and measurement results. This study conducts field monitoring and dynamic analysis on high-speed railway bridges to gather the acceleration signals and compare them. Significant difference in the size of the vertical acceleration was observed between the measured and dynamic analysis accelerations when discarding the frequency domain as done in the current specifications. The comparison of the accelerations considering only low frequencies below 30 Hz showed that the dynamic analysis reflected accurately the measured vertical acceleration.
Highlights
Europe has implemented continuously research on the dynamic behavior of railway bridges since 1950s
The D214 Project conducted by the European Rail Research Institute (ERRI) Committee provided the fundamental data that served as basis for the preparation of the specifications related to the dynamic behavior of high-speed railway bridges in the Eurocode and UIC [1]
Such approach is an important factor degrading the reliability of the evaluation of high-speed railway bridges and is inducing disagreement between the results of the dynamic analysis and the measured accelerations
Summary
Europe has implemented continuously research on the dynamic behavior of railway bridges since 1950s. A review of the specifications used for the design of the high-speed railway bridges from the Gyeonbu Line to date reveals that BRDM [6] applied for the Gyeongbu Line and the High-Speed Railway Design Code [7] were followed by the Honam High-Speed Railway Design Guidelines [8] for the passenger-dedicated high-speed railway line, and the current Railway Design Code [9] These regulations limit the vertical acceleration of the slab of high-speed railway bridges to 0.35 g and 0.5 g for gravel ballast and concrete ballast, respectively. These specifications regulate only the size of the peak vertical acceleration of the bridge slab as the Eurocode but without considering the frequency domain. This study conducted field monitoring and moving load analysis to gather the acceleration responses of high-speed railway bridges and compare the measured signals and analysis results with respect to the eventual consideration of the frequency domain
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