This paper elaborates the procedures for scaling prototype structure to scale model according to similitude laws keeping the dynamic properties of the original structure. The scaling procedures are very suitable for experiments where the purpose is not only to check the strength of the structure, but also to investigate the performance of other dynamic devices mounted on the primary structure such as dynamic absorbers. In such cases, the use of condensation methods comes to mind in order to reduce the original d.o.f. and make the model structure behave same in the first several modes as the original structure.
