Theoretical Analysis of the Possibilities to Improve the Dynamic Parameters of the Road Arch Bridge

During the load test of the road arch viaduct, it was found that it is very sensitive to dynamic effects. The occurrence of beats at the frequency of 2.50 Hz was registered. In order to clarify the causes of this phenomenon, a number of numerical analyses of the structure were conducted. It was found that in the arch structure, which has infrequently distributed inclined hangers, it may be possible for the frequencies in similar forms of flexural vibrations to appear. During the operational extortion, it leads to their disadvantageous consonance. There are several technical possibilities to improve the dynamic parameters of the analysed type of the arch viaduct (assembly of mass vibration dampers, the change of bearings and change of the layout of hangers). On the basis of the conducted theoretical analyses, the installation of the monitoring system was recommended.