Assessment of Traffic-induced Low Frequency Noise Radiated from Steel Box Girder Bridge

This study intends to investigate traffic-induced low frequency noises radiated from a seven span continuous steel box girder bridge which adopts steel decks and steel piers integrated with the superstructure rigidly. The low frequency sound pressure level (SPL) is estimated by means of the boundary element method (BEM) using velocity responses of the bridge. The velocity response is estimated from a three dimensional bridge-vehicle interactive analysis. The influence of the sound wave reflected by ground is also considered in the analysis using the image method. Observations demonstrate that the vehicle moving on the outer lane (slow traffic lane) gives higher SPL than running on inner lane (passing lane) because of the torsional effect. Increasing the number of vehicles increases SPL as expected KCI Citation Count: 6