Dynamic Analysis of Double Track Simply Supported Railway Bridge Under High-Speed Trains

An interest in the dynamic behavior of railway bridges subjected to high-speed trains in Indonesia increased within the construction of the first high-speed railway. Under high-speed trains, with speeds over 200 km/h, the dynamic effect has often been shown to be the governing parameter of bridge design, therefore a dynamic analysis is required. This paper presents a dynamic analysis of a simply supported railway bridge due to high-speed trains through moving axle loads using finite element models. The influence parameters of train and bridges i.e., train speeds, train loading configurations, and bridge span length on the dynamic responses of railway bridges is investigated. The effect of the delay time between entries of the trains on the double-track bridge is also examined. From the analysis, the dynamic responses of the railway bridge in terms of accelerations, deformations, and moments were obtained, and the critical or resonant speed over the speed range was identified. Dynamic amplification factors (DAF) are also determined from the dynamic responses and compared to current standards. Using the findings from this study, the influence of certain parameters on the dynamic behavior of high-speed railway bridges can be determined particularly for the preliminary design stages.