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In order to determine a realistic behavior of the structure during earthquake action it is necessary to apply realistic load conditions and real parameters of structure characteristics. That can be fully accomplished only by testing the structure in full scale, as proscribed by the Regulations of technical standards for construction of high-rise structures in seismic areas, that is, experimental determination of dynamic characteristics is performed on the finished structure by forced vibrations which will not cause damage. Such tests produce quite satisfactory results in the field of elastic behavior of materials and structures, which is presumed during the earthquake action, i.e., the structure must not collapse. In the paper is described experimental research of a five-storey building constructed in a large panel prefabricated system taking into consideration the parameters of interaction of soil and structure. On the basis of obtained parameters, and by testing the structure in longitudinal and transversal directions and rotation, mathematical model of the tested structure is formed, and through analytical procedure the expected, i.e. measured values are calculated. The relation force-displacement will be given for the linear model of the system foundation-soil, and then will be given the equations of free vibrations in the matrix form, on whose basis a computer program was mode. [ABSTRACT FROM AUTHOR]