The analysis of scientific and technical literature indicates the responsibility of joints of prefabricated elements of buildings for structural safety and reliability under the influence of static loads. According to numerous publications by domestic and foreign authors, in frame buildings, the first signs of destruction appear at the joints of elements due to stress concentration. It is possible that at the operation stage the joints will not meet the requirements of reliability and durability due to a number of reasons: the effect of non-design loads, the presence of defects in the manufacture of the joint and installation (non-design reinforcement, cracks in concrete, incomplete filling of joints, etc.). Therefore, ensuring the structural safety of the building and operational suitability by strengthening joints at minimum cost is an urgent task.