The foundation of elevated bridges is often subjected to changes in water level and earthquakes. This study monitors field data recorded from October 2020 to March 2022 using instruments installed at the pier, pile cap, and soil of elevated high-speed rail (HSR). The study also involves determining the vibration characteristics of the dynamic response of the HSR-induced vibration when there is a rise in water level. The characteristics of vertical acceleration (Az) in the time and
frequency domains are analyzed, using water level as the basis. The results show that the amplitude of the Az is larger when the water level is near the ground level than when the water level is lower. Moreover, the characteristics of the frequency spectrum are studied, and the effect of seasonal variation is observed. To observe the seasonal variation trend on the frequency spectrum, the averages of several frequency spectrums at the same speed under different seasons are compared. It is concluded that the amplitude modulation effect is more prevalent in dry conditions.
Furthermore, several earthquakes were reported during this period; representative examples of the earthquakes are presented in the paper. The amplification of the earthquake is studied, leading to the finding that seismic waves amplify from soil to structure at lower frequencies. A case of an HST passing during an earthquake is also presented in the paper, and the transfer function is calculated for the earthquake discussed in this paper. A numerical model has been developed, and the time history and frequency spectrum for dry and wet conditions compared for the field and
simulation obtained results. Similarly, earthquake model data had been predicted. The results of the analysis can help validate analytical models of elevated HSR.

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