Abstract
The metro in St. Petersburg, being the main mode of transport, has 72 stations, which have 303 escalators and 30 travelators of various types. Tunnel and span escalators, due to their design features, are both a machine and a structure. The service life of a part of the escalators by the beginning of 2023 exceeded the limits set by the regulatory and technical documentation. If any components and mechanisms can be replaced during repairs of various types, the supporting metal structures, with few exceptions, continue to work in the same conditions. A clear definition of the factors infl uencing the change in the state of supporting metal structures allows us to develop qualitative methods for determining their residual life and predicting the dynamics of various processes. This set of factors can be divided conditionally into two groups: factors related to design features and factors related to operation and environmental conditions. In conclusion, it is noted that the loads transmitted to the supporting metal structure consist of a large number of components of various origins and when assessing their impact, it is necessary to take into account the quantitative accumulation of corrosion damage.
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