New types of prefabricated-monolithic span structures of highway bridges and overpasses
Abstract
This article examines the problems of reinforced concrete span structures up to 33 meters long on highway bridges and overpasses. An analysis of the beams of domestic and foreign span structures was conducted, according to which the characteristics of the beams, such as the weight of the structure, the service life of the span structures between repairs, tensile and compressive stresses, acceptable load and durability, were considered. The article develops a constructive solution for span structures that meets new requirements for strength and durability under modern loads, as well as proposals for a new standard design of span structures for small and medium bridges. For this, the European experience of using monolithic reinforced concrete slabs with prefabricated blocks manufactured at the plant was relied upon. The practice of the former Soviet Union, however, suggests joining finished blocks with monolithic joints in bridge construction, which leads to a decrease in durability. The article provides an analysis of technical solutions used in the Republic of Uzbekistan and abroad, and also proposes a constructive solution that allows meeting all the requirements of the new domestic regulatory framework and ensuring the durability of structures at real facilities.
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