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Article presents the variation method of calculation of rod systems, strengthened by the increase of the size of the cross-sections of elements, change of the structural scheme and the stress state of the constructions. The methods of accounting the influence on the stress-strain state of repair stresses, the introduction of the new pre-stressed structural elements, changing the calculation scheme of strengthened structures are described. Relations used to calculate the strengthened rod systems with elastic and elastic-plastic deformations are shared

Method of Calculation of Strengthening of the Loaded Rod Structures Taking into Account Plastic Deformations