Comparison of typical highway bridges noise based on measured data

In order to study the noise of typical highway bridges, the spectral characteristics and spatial distribution of noise, as well as the structure-borne noise, are analyzed and discussed based on field-tested noise data of concrete box-girder ramp bridges, steel box-girder ramp bridges, continuous steel-concrete composite girder, simply supported concrete small box-girders, and simply supported steel-concrete composite girder. Results show that the environmental noise of highway bridges at night exceeds the noise limit, with a maximum difference of 9 dB(A); A-weighted sound pressure levels (SPLs) of highway bridge noise gradually decreases with the increase of horizontal distances, and the spectral characteristics are affected by noise barriers, municipal green trees, and the traffic noise on auxiliary roads. The significant frequency band and the percentage of solid-sound energy of the radiation noise of steel bridges structure are much greater than that of concrete bridges in the measurement frequency band of 20-1000 Hz. The research results can provide reference for selecting bridge structures based on acoustic performance.