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Title |
Analysis of Dynamic Response Characteristics for KTX and EMU High-Speed Trains on PSC-Box Railway Bridges
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Authors |
한만석(Manseok Han) ; 송민규(Min-Kyu Song) ; 신수봉(Soobong Shin) ; 이종한(Jong-Han Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.2.61 |
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Keywords |
고속철도교량; 동적 응답; 공진; KTX; EMU-320 High-speed railway bridge; Dynamic response; Resonance; KTX; EMU-320 |
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Abstract |
The majority of high-speed railway bridges along the domestic Gyeongbu and Honam lines feature a PSC-box type structure with a span length ranging from 35 to 40m, which typically exhibits a first bending natural frequency of approximately 4 to 5Hz. When KTX high-speed trains transverse these bridges at speeds ranging from 290 to 310km/h, the vibration induced by the trains approaches the first bending natural frequency of the bridge. Furthermore, with the upcoming operation of a EMU-320 high-speed train and the anticipated increase in the speeds of these high-speed trains, there is a need to analyze the dynamic response of high-speed railway bridges. For this, based on measured responses from actual railway bridges, a numerical model was constructed using a numerical model updating technique. The dynamic response of the updated numerical model exhibited a strong agreement with the measured response from the actual railway bridges. Subsequently, this updated model was utilized to analyze the dynamic response characteristics of the bridges when KTX and EMU-320 trains operate at increased speeds. The maximum vertical displacement and acceleration at the mid-span of the bridges were also compared to those specified in the railway design standard with the increasing speed of KTX and EMU-320.
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