Abstract
The paper describes method to evaluate residual service life of reinforced concrete structures of railroad bridges, enabling to consider the presence of defects, operation history, and climatic factor to calculate probabilities of the structural state at any given moment of time. The model based on semi-Markov process was used to predict the state and calculate reliability indicators of structures and their elements. The data sources for reliability models are results of observations of the structural state, mathematical models of occurrence and development of defects. The example of determining residual service life of reinforced concrete superstructure is given based on the mathematical model of working reinforcement corrosion development.
Highlights
Over forty three thousand reinforced concrete superstructures are currently being operated on the railway network in the territory of the Russian Federation [1,2]
Density of probability distribution of reinforced concrete superstructure being in one state before transition into the other state is complying with the distribution law of VeibullGnedenko with two parameters [8, 9, 10]
The graphs of several of these functions f(t), based on the statistical data processing of observing the state of reinforced concrete superstructures on the West Siberian railway according to database Automated Control System of Engineering Structures are given in Operation life (t), years
Summary
Over forty three thousand reinforced concrete superstructures are currently being operated on the railway network in the territory of the Russian Federation [1,2]. The major part is slab and ribbed structures which are mainly produced from conventional reinforced concrete and designed to sustain the loads of 1907, 1925, Н7, Н8, С14, etc. The service life of 4.6% of superstructures, designed by the projects of 1911 to sustain the load of 1907 is >90-100 years. Superstructures designed to sustain the load of 1925 (2.6% of the total superstructures amount) are being under operation for 80-90 years, withstanding the load Н7 (6.1%) and Н8 (29.3%) – for 70-85 years. The service life of superstructures designed to sustain the load С14 (54.1%) does not exceed 50 years
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