Abstract
In order to better study the vibration characteristics of railway viaduct, field test and pulsation test are carried out for the bridge vibration caused by the operation of a high-speed railway train. The natural vibration frequency of the bridge is analyzed, and 1 / 3 octave analysis and wavelet analysis are carried out for the vibration signal caused by the train excitation. The analysis results show that: the measured value of vertical frequency of bridge is close to the theoretical value, and the measured value is slightly larger than the theoretical value; the wavelet analysis results show that the vibration energy of the measured points is mainly concentrated in the third frequency band (15.625 ∼ 31.25 Hz), the fourth frequency band (31.25 ∼ 62.5 Hz) and the seventh frequency band (250 ∼ 500 Hz). Compared with the urban viaduct, the vibration and noise analysis of high-speed railway bridge should be appropriately extended to 500 Hz. The time-frequency diagram shows that the main vibration frequency range of the bridge is about 30-60 Hz.
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