Vehicle-induced vibration of vertical noise barrier on railway bridge

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (13) : 88-95.

LI Xiaozhen1, LEI Kangning1, GONG Zhenhua1, BI Ran1, HU Zhe2, XU Hong3, ZHENG Jing1

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Abstract

In order to study vibration characteristics of vertical noise barrier on railway bridge during trains passing through, a vertical noise barrier on a certain railway bridge was taken as the background. Vibrations of rail, box girder and noise barrier column at mid-span of the bridge were measured on site, and time domain analysis and 1/3 octave analysis were performed on the test data. Based on the vehicle-line-bridge coupled vibration theory, the bridge-noise barrier coupled vibration analysis model was established, and its reliability was verified with the actually measured results. Furthermore, the distribution law of noise barrier vibration and effects of train speed on it were studied, and a vibration reduction measure was proposed. The results showed that vibrations of rail and box girder top plate reveal obvious periodicity, and their peak value frequencies are 1 250 Hz and 200 Hz, respectively; vibration of noise barrier column is stronger than that of box girder top plate, and vibration at middle of the former has similar time history characteristics to those of the latter, and the former’s dominant frequency range is 50-500 Hz, and its peak value frequency is 50 Hz; vibration of column gradually increases from bridge end to mid-span, and in the same section, vibration at top of column is the strongest, vibration at mid-column is the smallest and affected by the position of section the most obviously; vibrations of box girder and column vary gently with train speed in the range of 120-180 km/h; during train speed being within the range of 180-200 km/h, column is more sensitive to train speed comparing with box girder; vibration of noise barrier column can be effectively reduced by adding flange braces.

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vertical sound barrier / vehicle-induced vibration / vibration test / vehicle-bridge coupling

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LI Xiaozhen1, LEI Kangning1, GONG Zhenhua1, BI Ran1, HU Zhe2, XU Hong3, ZHENG Jing1. Vehicle-induced vibration of vertical noise barrier on railway bridge[J]. Journal of Vibration and Shock, 2021, 40(13): 88-95

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