Methods for research the dynamic effect of the trams on bridge structures.

The research paper is devoted to the study of the practical dynamic impact of the tram rolling stock on city bridges. The authors analyzed the current state and prospects for the tram rail lines' development in conjunction with bridge crossings in Novosibirsk and Rostov-on-Don. It is considered the requirements for the dynamic impact accounting of the tram traffic specified in domestic and foreign regulatory documents. Using a mobile measuring complex, which includes accelerometer sensors, an experiment was carried out, and according to the obtained results the natural frequencies of vertical, horizontal transverse and horizontal longitudinal vibrations of the 71-619K and 71-605 tram cars were determined. The technique used in the experiment makes it possible to obtain the initial data for the dynamic calculation of structures for the tram traffic, to clarify the real dynamics of the rolling stock, depending on the state of the rail track on the bridge. The data obtained can be used in vibration diagnostics when assessing the state of an engineering structure. [ABSTRACT FROM AUTHOR]