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Along with the development of the latest technologies in the construction of new structures, the reconstruction and major overhaul of existing buildings is also an important part of the construction complex, which needs improvement. One of the most common types of construction works performed during the renovation of buildings is the strengthening of reinforced concrete beam structures, namely: crossbars, floor slabs, coverings, beams, etc. Usually, in practice, to strengthen these structures, the following methods are used: increase in cross-section due to build-up; change of static scheme of work due to installation of tighteners, struts, racks, etc. 1 . However, sometimes the installation of additional, bulky, reinforcement designs is unacceptable because it causes changes in construction design and layout decisions of the interior space of the building at the same time significantly increasing the load on the bearings and the foundations. In this case, the method of reinforcing structures through external reinforcement is quite effective and advisable 2 . The principle of such

STRENGTHENING OF REINFORCED CONCRETE BEAM STRUCTURES USING EXTERNAL REINFORCEMENT. EFFICIENCY RESEARCH