RESEARCH ON THE RESISTANCE OF VENTILATED RAINSCREEN FACADES TO DYNAMIC AND VIBRATIONAL LOADS

The study aims to determine the stability of KMD VF ventilated facades, featuring RONSON 250×65×22 Busum facade tiles, when subjected to vibrational and dynamic influences. A key objective is to assess their applicability in seismically active regions of Ukraine. To achieve this, both computational analyses of the stress-strain state of the facade system elements and experimental laboratory tests on a fragment of the system were conducted. The research methodology involved a comprehensive literature review and analysis of existing technical documentation. An experimental procedure was developed for testing on a vibration stand, utilizing a Vibran-2.0 vibro-analyzer and a universal strain gauge station. A facade system fragment measuring 1000×900 mm was subjected to controlled vibrational loads. Concurrently, a numerical model of the fragment was developed and analyzed using the Lira-SAPR software. The computational results were then rigorously compared with the experimental data, confirming the adequacy of the calculation scheme with an error not exceeding 7%. Furthermore, a detailed calculation of the facade system's response to seismic loads was performed for a hypothetical 36-meter high-rise building situated in a 9-point seismic zone, in accordance with DBN В.1.1-12:2014. The spectral method was employed, and the computational model utilized volumetric finite elements for the building and clinker, shell elements for brackets and purlins, and special finite elements for modeling connections between clinker-purlins, purlins-brackets, and brackets-building. The experimental tests demonstrated the facade system's resilience and integrity. No individual tiles detached, and the connection nodes remained reliable, even under load levels corresponding to approximately 60% of a 9-point seismic event. The seismic load calculations further corroborated these findings, indicating that the overall bearing capacity utilization of the system did not exceed 65%, thereby maintaining a substantial 35% safety margin. Crucially, the protection against the fall of individual tiles was ensured with a significant 57% margin. Based on the comprehensive results obtained from both experimental and computational investigations, it is concluded that the use of KMD VF ventilated facades, adorned with RONSON 250×65×22 Busum facade tiles, is feasible and recommended for construction projects located in seismically hazardous regions of Ukraine.