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The article proposes an approach of six degrees dynamic model of a rigid-solid with some types of symmetries. These symmetries lead to simplified mathematical models, which are more easily to solve. If the rigid-solid is jointed of the structure by four elastic links, the mathematical model becomes still simple and the vibrations are decoupled into four subsystems of movements: side slipping and rolling, forward motion and pitching, lifting motion, gyration. There is also a case study: the modal analysis of a bridge with the total length of 200 meters, 13.2 meters width and 2.5 meters height, modeled as a rigid solid elastically beared.

SOME CONSIDERATIONS ABOUT THE DYNAMICS OF THE REINFORCED CONCRETE BRIDGES MODELED AS A RIGID SOLID WITH VISCOUS-ELASTIC BEARINGS