The paper deals with the passive isolation for a rigid structure building insulated on anti-seismic elastic devices. The basic hypothesis is that according to the structure presents geometrical and insulation configurations symmetries. This allows the decoupling of the eigenmodes and thereby, is simpler to evaluate the impact of the dynamic forces transmitted through the terrain-structure path during the earthquake. The classical theory of the vibration isolation is the base for evaluate the isolation degree for the considered structure. As an excitation factor it was considered the complex signal of an earthquake defined through the ground motion acceleration. The analysis that was made in the paper reveals the need to identification and evaluation requirements for the functional correlations between the reference parameters of the considered structure and the characteristics of the isolating and insulating devices.

Key words: anti-seismic devices, vibration isolation, eigenmodes, isolation degree.

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