A very popular floor system consists of precast one-way voided slab elements. A modal analysis of such a floor has been performed using a multivariable AR-model. The eigenfrequencies, the damping ratio's and the mode shapes of the floor have been determined. This test has been repeated at different storeys of a building. The same floors were also tested before and after the installation of the finishing layer. The reinforced hollow core floor has been modeled by means of a Finite Element Analysis (FEA). By comparing the eigenfrequencies and the mode shapes obtained by the ARV-model with the results obtained by FEA the influence of several physical parameters has been investigated: the stiffness of the slab elements in two directions, the transverse connection between two different elements, the connection between the slab elements and the outer walls and the influence of the brick inner walls.
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