Influences of Ground Reflection on the Elevated Box Bridge Structure Noise

A 32 m simply supported concrete box bridge is taken as the research object. The box bridge structure noise induced by the static loads and how the ground reflection affects it are studied by the modal acoustic transfer vector (MATV) method. The results show that it is commendable to analyze the box bridge structure noise using the MATV method; the regularities of the sound field distribution are changed obviously by the ground reflection, and the directivity is very obvious in the far-field region and there has the stratification of the vertical sound field under the box bridge; the ground reflection enhances the overall sound level of the sound field except the region above the box bridge, and the vertical sound field in the far field is affected very obviously. The buildings, especially the high-rise buildings, are mostly in the far field area, so the influences of the ground reflection on the box bridge structure noise must be paid attention to.