Rezumat/Abstract. The dynamic characteristisc represents the basic elements necessary to be known for an analysis of the building behavior during an earthquake. The experimental determination of these parameters is very important for the building which undergone some damages during previos earthquakes. In those cases, to estimate only by theoretical computing the behaviour of a building could conduct to rezults with a low degree of confidence. As experimental methods to establish the dinamic characteristics of a structure, are the method of forced vibration, induced into the structure and the environmental methods.

Cuvinte cheie/Key words: dynamic characteristics, eigenvalues

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