Abstract
The problem of the durability of reinforced concrete structures of urban engineering structures is currently one of the urgent problems in modern construction due to the continuously growing volume of expensive repair and restoration work, facilities reconstruction, a tendency to a general decrease in quality requirements, and the scale of reinforced concrete structures application in difficult climatic conditions. The theoretical foundations of calculating the residual life of the force resistance to transverse bending with the strength of normal sections in the article, algorithms for calculating the residual life of the force resistance and reinforcement of corrosion-damaged reinforced concrete structures are defined. A complex calculation method is considered in this article that allows to quantitatively assessing the state and resources of crack resistance of reinforced concrete structures damaged by corrosion, to calculate the necessary levels of compression and loss of tension, as well as the exposure to preserve crack resistance in time at specific loading levels and intensities of corrosion effects. The developed complex calculation method can be presented as part of the solution to the problem of preventing and eliminating emergency situations. The theoretical basis for calculating the residual resource of strength resistance to transverse bending by the strength of inclined sections are discussed in the article, the calculation algorithms are studied, and examples are given.
Highlights
Reinforced concrete remains the main material for environmental, communications, utilities, special and a number of other structures in the short term
The residual resource of power resistance to transverse bending at normal cross section strength in accordance with [8-15] can be calculated: In case of colmatization corrosion damage (m0), the task involves two variants of formulation [9-20]: First one in case δ
Modern methods for assessing the fracture toughness resource, taking into account the influence of corrosion damage, are still being developed, and in the available publications there are no proposals for taking into account some important factors; for example, the factor influencing the level of stress state on corrosion damage and crack resistance of concrete
Summary
Reinforced concrete remains the main material for environmental, communications, utilities, special and a number of other structures in the short term. Reinforced concrete is used as a material for technological equipment and transport and storage structures requiring a high level of security. At the same time, such structures very often experience the effects of aggressive media, and are exposed to corrosion damage. This reduces their fracture toughness, negatively affects their operational suitability and even structural safety [1-5]. The reinforced concrete structures operation in aggressive environments, temperature influences, as well as changes in operating technology and an increase in payloads lead to a decrease in the service life of facilities, to an increase in the volume of work to restore and strengthen reinforced concrete structures
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