Natural Oscillations of a Tower-Type High-Rise Building: Modes of Horizontal, Vertical and Rotational Oscillations According to the Standing Wave Method and Verification of the Computational Model

For a unique building in the form of a tower with a core of rigidity in the center, experimental studies of natural oscillations by the standing wave method with theoretical calculations based on a finite element model are performed and compared. From the experiment, ten translational horizontal modes of natural oscillations, five torsional modes of natural oscillations, and eight vertical modes of natural oscillations were identified and investigated. The finite element model is used to calculate the natural oscillations corresponding to all experimentally isolated oscillation modes. The experiment and theory are compared over the entire set of natural frequencies. Differences in natural frequencies reached 20%. After the studies, if possible, correction of the computational model ensured the difference between the experiment and the theory in terms of the values of natural frequencies of no more than 7.5%. Verification of design models of buildings using the standing wave method is an effective approach to assessing the physical condition of buildings and their seismic resistance.