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  Volume 8, Number 1, January 2023 , pages 1-12

Numerical analysis for dynamic characteristics of bridge considering next-generation high-speed train
Soon T. Oh, Dong J. Lee, Seong T. Yi and Byeong J. Jeong

    To consider the effects of the increasing speed of next-generation high-speed trains, the existing traffic safety code for railway bridges needs to be improved. This study suggests a numerical method of evaluating the new effects of this increasing speed on railway bridges. A prestressed concrete (PSC) box bridge with a 40 m span length on the Gyeongbu track sector is selected as a representative example of high-speed railway bridges in Korea. Numerical models considering the inertial mass forces of a 38-degree-of-freedom train and the interaction forces with the bridge as well as track irregularities are presented in detail. The vertical deflections and accelerations of the deck are calculated and compared to find the new effects on the bridge arising with increasing speed under simply and continuously supported boundary conditions. The ratios between the static and dynamic responses are calculated as the dynamic amplification factors (DAFs) under different running speeds to evaluate the traffic safety. The maximum deflection and acceleration caused by the running speed are indicated, and regression equations for predicting these quantities based on the speed are also proposed.
Key Words
    dynamic amplification factors; next-generation high-speed train; PSC box bridge; traffic safety; vertical deflections and accelerations
Soon T. Oh, Dong J. Lee and Byeong J. Jeong: Civil and Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea

Seong T. Yi: Department of Civil and Environmental Engineering, Inha Technical College, Incheon 22212, Republic of Korea

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