EXACT SOLUTIONS FOR FREE VIBRATIONS OF

This paper deals with a class of free vibrations for a two-span, two-lane steel-concrete bridge. The deck structure is modeled as a thin, homogene-ous, orthotropic plate stiffened by beams running along the longitudinal direction of the bridge. The method of separation of variables is used to find exact solutions for a class of free vibrations of the structure. A comparison between analytical and experimental natural frequencies and vibration modes of the bridge is presented and discussed. Key words: vibrations, bridges, orthotropic plate, eigenvalue problem, exact solution