Abstract：From the perspective of bending guided-wave, by combining vibration experiments with numerical simulations, the dynamic characteristics and vibration mechanism of steel-slab-ribbed bridge-deck are studied. Firstly, the vibration laboratory test of the steel-slab-ribbed bridge-deck is performed. Secondly, a test-verified three-dimensional dynamic model is established based on the modal superposition finite element method, so that the plate vibration energy can be calculated. Furthermore, based on the finite element mode analysis method, the guided-wave types and dispersion characteristics are studied with a guided-wave model. Finally, the influences of plate thickness, rib thickness and rib space on vibration energy and characteristics of bending guided-wave are studied. The research results discloses that under unilateral suspension constraints, the dominant frequency bands of plate and rib vibration responses appear at 300 Hz and 400 Hz, and the vibration energy at the measuring points of rib edge is greater. Under the boundary consolidation constraint, the thinner plate has higher vibration energy peak value and lower peak frequency. From the perspective of guided wave transmission, the pass-band and attenuation band may appear with interval on the frequency dispersion curves of bending waves, the guided-wave mode number decreases with the increase of plate and rib thickness. Plate thickness has the greatest influence on the out-of-plane vibration attenuation zone, and the maximum difference in bandwidth is 110 Hz. Therefore, the out-of-plane wave vibration attenuation zone can be effectively controlled through plate thickness.
