Dynamic response of trackside structures due to the aerodynamic effects produced by passing trains

The correct evaluation of the dynamic response of trackside structures is relevant for several technical issues including the design of wind/noise barriers and structures used as support platforms for equipment that are sensitive to vibration. The vibration of trackside structures is produced both by the seismic action generated by the passing train, as well as by the aerodynamic loads. To proceed towards the formulation of a mathematical model able to predict the dynamic behavior of trackside structures, an experimental campaign on a steel frame located close to a railway has been carried out. The dynamic response of the structure, the vibration of the foundation and the pressure generated by the train passage have been analyzed through a time-frequency representation. On the basis of these results a non-dimensional model representing the aerodynamic response of trackside structures has been developed and its maximum response has been represented through a response spectrum borrowing a familiar concept from earthquake engineering.