Abstract
The paper presents the results of vibroacoustic tests of a plate girder railway bridge consisting of two parallel dilated structures and a common ballast trough. The requirements currently set for railway bridges relate to, among others, vibrations considered as one of the criteria for traffic safety and to noise emissions that may pose a threat to the environment. In this article, the results of tests conducted on vibrations of elements of the analyzed structure are presented, and the level of these vibrations in terms of meeting the requirements of the European standards is assessed. Vibrating criteria of structure performance were checked, and safety was assessed. The results of noise measurements in the vicinity of the analyzed bridge are also presented, and the environmental impact of this structure is determined. The test results show that the bridge meets the requirements for vibration acceleration and noise. An increased acoustic emission in the analyzed case does not pose a significant threat, but if this type of structure was on high supports in an urbanized area, it would be a nuisance to the environment.
Highlights
Experimental research for the assessment of railway bridges is important in the context of identifying their serviceability condition
Dynamic tests of bridges are used to assess behavior under train loadings, validate design conceptions, evaluate condition state, carry out damage detection based on vibration analysis, and perform environmental impact assessment
The issue of bridge vibrations has been raised in many research papers, including [2,3,4,5,6]
Summary
Experimental research for the assessment of railway bridges is important in the context of identifying their serviceability condition. Viaducts, or flyovers may have a much greater impact on the environment than trains using a track without engineering structures This impact may be manifested by increased noise emissions. The study [12] stated that when a train passes over a bridge, vibrations are generated owing to irregularities in the wheels and the track. The results of the vibration and noise analysis of a new railway bridge of a relatively unusual, unique structure are presented. Vibracoustic properties of this type of construction have not yet been presented in the literature. In order to check whether the bridge has a negative impact on the environment, the simultaneous measurement of accelerometers and microphones was used, and the coherence function was determined
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