Abstract
The structure-borne noise while the vehicle passing across the bridge expansion joint is the main source of urban bridge noise. In order to control this noise pollution, 20 bridges including three types of typical expansion joints in Ningbo City were selected, and the noises were measured while vehicle passed across the bridge expansion joints. The measured results are expressed by the Z-weighted sound pressure level, which kept the effect of the low-frequency noise. Then the influence factors of this noise are discussed. The results show that: (1) The sound pressure while vehicle on the bridge expansion joints is much greater than that on the normal road or mid-span of the bridges, which results in significant environmental noise pollution; (2) The wider the gap of the bridge expansion joints, the greater the noise level; (3) The noises produced by the modular expansion joints and comb-plate expansion joints are greater than that from the single-gap expansion joints.
Highlights
With the development of urban modernization, the number of viaduct roads has increased significantly
More than 20 bridges in Ningbo are selected in this paper, the sound pressure of vehicles passing through the bridge expansion joints are measured, the sound pressure level are calculated, and the influence factors of bridge expansion joint noise are discussed
3.1 Bridge expansion joint noise From the time-history of expansion joint noise shown in Figure 4, it can be seen that two peaks of the sound pressure appear when the front and rear wheels of the vehicle passing across the bridge expansion joint, respectively
Summary
With the development of urban modernization, the number of viaduct roads has increased significantly. Ghimire [1] and Sexton [2] pointed out that the noise generated by vehicles passing bridges, especially the bridge expansion joints, has become a kind of environmental pollution. It is very important to analyse the noise of bridge expansion joints. There are many work on the noise of the main structure of the bridge, but only a few researches on the noise of the bridge expansion joints. The work of using the measured data to analyse the noise of the bridge expansion joint is still lacking. More than 20 bridges in Ningbo are selected in this paper, the sound pressure of vehicles passing through the bridge expansion joints are measured, the sound pressure level are calculated, and the influence factors of bridge expansion joint noise are discussed
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