Experimental determination of glass units strength under point load from temporary installation tools for blinds and sun protection systems

Due to the possibility of using vacuum mounting suction cups in modern construction practices, it is imperative to determine the safe threshold of point load on glass units that are vulnerable to local forces. The present paper elucidates the findings of an experimental investigation into the strength of a double-layer glass unit with an air gap under the action of a local load typical of vacuum-fixed assembly tools. The research methodology involved varying the angle of force application (0°, 45°, 90°) and the positioning of the suction cup (center/edge), while recording deflections at designated control points using electronic micrometers. It was determined that the suction cup detached when subjected to a load of 86 kg in the "90°, center" glass configuration, whereas other configurations remained undamaged up to loads of 50 kg. To ensure safety and preserve the integrity of the double-glazed unit, tests for loads greater than 50 kg were carried out only in the «90° configurations, centered at the», which was determined to be the most vulnerable based on previous tests. Other configurations showed no signs of damage up to 50 kg, and further testing was considered unnecessary due to the lower stress concentration. The findings can be used to formulate recommendations for the safe application of mounting equipment and to enhance the regulatory framework for the interaction of fasteners with transparent structures.