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HSR bridges are exposed to repetitive dynamic loading induced by the passage of high-speed trains (HSTs). Moving loads from HSTs can amplify the dynamic responses of bridges. The dynamic amplification factor (DAF) has been measured by the ratio between maximum dynamic to static responses of bridges when train passes over it. It is difficult to measure the static response during train operation. This study proposes a new framework to assess the DAF of HSR bridges using a multi-sensor fusion technique, which separates the total bridge response into the static and dynamic responses using a single measurement. The proposed method generates time-varying dynamic magnification by calculating the ratio of extracted dynamic response to static response at each measured time step. This method was applied to an HSR bridge under resonance conditions in South Korea and provides a clear understanding of how HSR bridges in resonance.

Dynamic amplification assessment of high-speed railway bridge under resonance condition using multi-sensor fusion