UkrainianProfessional Education

Abstract

The analysis of inspection results and experience in the operation of transport facilities show that bridges with string-concrete girders according to the standard designs VTP-16 and VTP-15 are in the worst condition. The wire prestressing reinforcement of these beams, which has a small diameter of 3 mm or 5 mm, loses its cross-section over time and breaks due to corrosion. This leads to the exhaustion of the residual service life of string-concrete girders on many bridges, which has caused several collapses in Ukraine in recent years. The structural features of string-concrete girders, including the use of small-diameter prestressed wire reinforcement, play a key role in their long-term operation and reliability. The number of such structures on Ukrainian roads of national importance reaches about 500 units, and their service life is more than 60 years. Lack of proper maintenance can lead to serious economic and safety problems. Analysing the technical condition of bridge span elements and identifying defects helps to improve traffic safety, extend the service life of bridges and reduce overall costs. Effective repair and strengthening of bridge structures ensure the normal functioning of the transport infrastructure, which is critical for the economic development and security of the country. This article investigates various aspects of the operation of bridges with string-concrete girders. The causes of defects are analysed and proposals are made to temporarily preserve the stability of structures prior to major repairs or reconstruction. The structural features of bridges with string-concrete girders reveal significant shortcomings that eventually lead to serious problems. Small-diameter wire prestressing reinforcement is prone to corrosion, which reduces its cross-section and leads to rupture. This, in turn, can lead to a complete collapse of the bridge span

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