Abstract
The existence of a joint in composite slabs is interpreted as the occurrence of a contact layer in a homogenous monolithic slab. As a result, a reinforced concrete composite slab model is comprised of a serially joined element describing the properties of a monolithic slab and an element describing the influence of a contact layer. The reinforced concrete slab model was verified based on investigations into the decay of free vibrations of five composite slabs and one monolithic slab. It was evidenced that the model's structure is correct. It was also revealed that in case of composite slabs the destruction of which was accompanied by delamination, stiffness and the decay of an element describing the influence of a contact layer are characterised by non-linearity. This finding sets a basis for the currently developed method of forecasting the bearing capacity of reinforced concrete composite slabs according to delamination.
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