This paper presents an experimental investigation of soil-structure interaction. The study tests a small-scale steel frame model using shaking table. The model features two columns, connected by a foundation beam and a girder at the top with the superstructure’s mass. The testing encompassed two distinct configurations: first where the model was fixed to the shaking platform and second where the model was placed on a sand bed. Throughout the experiments, displacements were meticulously recorded over time, by a system for optical measurement. A local Drava sand was chosen for the experiment. Notably, the experiments were conducted under both dry and saturated conditions.  Analyzing the results one can conclude that fixed base models have different behaviour compared to models founded on soil. Stiffness of the soil has a big impact on the behaviour of the soil-structure system where stiffer foundation soil results with behaviour closer to fixed base case while the flexible soil changes behaviour of the models considering the displacements which are the result of dynamic excitation.