The dynamic response to time varying loads, e.g. wind loads or earthquakes, is in many cases decisive when designing a tall timber building. The structural parameters governing the dynamic behaviour are the mass, the damping and the stiffness. The last two parameters are not well-known at serviceability levels for timber structures in general and for timber connections specifically. Results from forced vibration tests on single components and on a full-scale truss for an eight-storey residential building have been analyzed. In parallel, a detailed Finite Element (FE) model of a large Glulam truss with slotted-in steel plates and dowels connections has been developed and simulations have been made. The damping caused by the structural components, the embedment of fasteners and friction of mating surfaces of components in the selected connection types is quantified experimentally. The materials' stiffness values in the model were evaluated. The results from this study bring knowledge on the structural dynamic properties of large timber structures with mechanical connections and will facilitate the performance prediction of new tall timber buildings for better comfort at higher levels in environmentally friendly expansions of our cities.