Abstract
Prestressing in building structures has been used for a long time. However, the prestressing of structures with a combined cross section, such as steel-concrete structures, has appeared recently. The report is devoted to the structural types of prestressed steel – concrete structures, the description of technical solutions and comparative analysis with known sources. A comparative analysis of the methods of prestressing steel – concrete beams with widespread methods of prestressing reinforced concrete and steel structures is carried out. The article is devoted to prestressed composite beams, the identification of both the stress – strain state of beams of a composite section from prestressing and from operational loads is analyzed. Analytical expressions are given for assessing the strength of prestressed steel – concrete bending elements for different methods of prestressing, and the results of numerical and full-scale tests. Comparisons of the results of numerical and field experiments in the form of graphs are given. In conclusion, satisfactory convergence of various methods for assessing the strength of prestressed beams with experimental studies is noted.
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