Abstract
This research regards the analysis of the low frequency sound radiated from simply supported highway girder bridges when a vehicle traveling over them. First, running experiment was carried out using a test vehicle on a composite girder bridge, and investigation into the vehicle model which is proper for calculating radiated sound was performed. Next, by vibrating actual bridges using impact, the frequency response function were determined. The method of calculating radiated sound by utilizing the frequency response functions was proposed, and its applicability was confirmed. Finally, on the effect that the degree of roughness on bridge surfaces and the irregularities at the expansion joints exert to maximum SPL being radiated numerical analysis was carried out, and it was elcuidated that the SPL varied in close response to velocity parameter α.
