Measurement and analysis of bridge expansion joint noise

The structure-borne noise while the vehicle passing across bridge expansion joint is main source of urban noise. In order to control this pollution, 20 bridges including three types typical joints in Ningbo City were selected, and noises measured passed joints. results are expressed by Z-weighted sound pressure level, which kept effect low-frequency Then influence factors discussed. show that: (1) on much greater than that normal road or mid-span bridges, significant environmental pollution; (2) wider gap joints, level; (3) produced modular comb-plate from single-gap