The one-dimensional wave propagation parallel to the frames in a hull-structure is investigated. Rotation and shear, and thus also the coupling between flexural, longitudinal and transverse waves, are included in the model. The wave numbers for travelling waves and for near field solutions are derived for two typical frame constructions. The effects due to a water load on the hull plates are also investigated. It is found that for low frequencies the lateral motion of the construction is mainly determined by pure bending. The results indicate that the wave numbers calculated, when shear and rotation are included, exceed by more than 50% the result obtained for pure bending for frequencies above 600 Hz in a typical main frame structure. For high frequencies, the energy flux in the hull plate is dominant. The particle velocities in the hull plate and the frame are also compared.