<p>The structural coupling technique between two buildings emerged at the end of the last century as a solution to problems of large oscillations in structures located in areas with a high concentration of closely spaced structures. This solution aims to prevent the pounding phenomenon and control the vibrations of both structures, which are susceptible to dynamic loads (e.g., wind and seismic forces). Recent studies demonstrate this technique’s effectiveness in mitigating the dynamic responses of coupled structures compared to uncoupled ones. Thus, this work presents a numerical and experimental analysis evaluating the dynamic response of adjacent three-dimensional steel buildings coupled with rigid bars. A modal identification was performed on the experimental miniature buildings, which were built using welded steel modules and assembled with bolts. Based on these experimental modal data, the three-dimensional finite element model was validated and the stiffness parameters of the connections were adjusted. Thus, a steady-state analysis was performed on the coupled numerical model and experimental tests were conducted with a shaker device. The responses of the coupled and uncoupled structures of the numerical and experimental models were compared to assess the effectiveness of this technique in controlling the vibrations of these structures subjected to dynamic loads. The coupling technique was shown to be effective in reducing the absolute maximum displacements when compared to the uncoupled building and also presenting a 24% increase in the first vibration frequency of the coupled building relative to the uncoupled structure, based on the comparison of different experimental tests. However, it was not effective in mitigating the peak acceleration responses of the structures, indicating that for a more efficient solution, rigid connections should be combined with other types of control devices.</p>