Rolling noise and structure-borne noise from the viaducts usually lead to complaints from nearby residents. Concrete box section bridges are traditionally adopted for the viaduct but those with U-shaped sections have become popular recently due to their more attractive form and reduced visual impact. One question that often arises in relation to the choice of the section types is their relative noise performance. This study aims to compare the vibration and noise characteristics of concrete bridges with different sections by using the same noise prediction method. A coupled track-bridge model is introduced to obtain the rail vibration and the power input to the bridge through the rail fasteners. A three-dimensional acoustic finite element method is applied to obtain the noise radiated from the bridge and the rail subjected to given multiple forces acting on them. The averaged mean squared vibration velocity of the coupled wheel-track-bridge model subjected to roughness excitation is used to scale the noise from the acoustic model. This noise prediction method is then validated by comparison with field measured noise from a U-shaped bridge in Shanghai. Comparative investigations are conducted among the U-shaped bridge, a box girder bridge with single cell and a twin-box girder bridge with two cells. It is found that the rail noise is about 10 dB larger than the bridge noise for the three bridges at positions to the side of the bridge. The U-shaped girder generally leads to higher total noise levels than the box girders by about 1 dB(A) when they have the same height of noise barriers. In terms of the bridge noise, the single-box and twin box girders produce an average of 2.4 and 4.2 dB(A) less noise than the U-shaped girder.
Comparison of Vibration and Noise Characteristics of Urban Rail Transit Bridges with Box-Girder and U-Shaped Sections
Notes Numerical Fluid Mech.
Noise and Vibration Mitigation for Rail Transportation Systems ; Kapitel : 76 ; 691-698
2021-04-09
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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