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DOI: 10.15862/01TS416 (https://doi.org/10.15862/01TS416)

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Ovchinnikov I.I., Ovchinnikov I.G. [Directions for the development of structural mechanics of the bridge and road constructions developed in the Saratov State Technical University] Russian Journal of Transport Engineering, 2016, Vol. 3, No. 4. Available at: https://t-s.today/PDF/01TS416.pdf (in Russian). DOI: 10.15862/01TS416

Directions for the development of structural mechanics of the bridge and road constructions developed in the Saratov State Technical University

Ovchinnikov Ilya Igorevich
Yuri Gagarin state technical university of Saratov, Russia, Saratov
Moscow state automobile & road technical university
Sochi branch, Russia, Sochi
E-mail: bridgeart@mail.ru

Ovchinnikov Igor Georgievich
Penza state university of architecture and construction, Russia, Penza
Yuri Gagarin state technical university of Saratov, Russia, Saratov
Perm national research polytechnic university, Russia, Perm
E-mail: bridgesar@mail.ru

Abstract. The article deals with the problems of structural mechanics of the bridge, road and other constructions, most of which began to take off at the «Bridges and Transportation» department and continues to develop at the «Transportation» department of the Saratov State Technical University named after Y.A. Gagarin. One of these directions is a structural mechanics of constructions interacting with the aggressive environments. It is stated that the methodology for building models of deformation and fracture of constructions interacting with the aggressive operational environments has been developed on the basis of the use of the phenomenological approach, according to which the generalized model of the structural behavior in an aggressive environment includes several models: 1) a model of structure with the technical hypotheses about the nature of its deformed state; 2) a model of the aggressive environment penetration and its impact on the material, leading to its destruction; 3) a model of material deformation taking into account the impact of aggressive environments and 4) a model of fracture interpreted as the damage accumulation. With the use of described approach there were developed the models of deformation and fracture of constructions exposed to high-temperature hydrogen corrosion, low-temperature hydrogenation and stress-corrosion fracture, attack by hot metals such as sodium, lithium, antimony, models of deformation of the thin-walled shell structures exposed to corrosive wear in a non-uniform temperature field, as well as models for the strength calculation of complex rod and pipeline constructions taking into account the corrosion damages. A wide class of deformation models was created for the rod, beam, plate and shell reinforced structures exposed to carbonation, chloride and sulfate attacks, stress-corrosion cracking and the combined effect of the various aggressive environments. The author developed a methodology for calculating reinforced structures taking into account the breaking aggressive factors and made numerical modeling stress and strain state of the reinforced concrete structures, taking into account inductive and time-varying non-uniformity and strain anisotropy caused by the combined action of loads and aggressive environments. He considered a problem of producing and applying stochastic models of deformation and degradation for the reinforced concrete bridge structures considering the breaking aggressive environments. The author also considered a problem of producing and studying deformation models of multilayer structures applied to the pavement on the orthotropic reinforced concrete slab of the bridge construction, as well as a task of design-basis justification of constructions for the bridge expansion joints. He examined such areas of the structural mechanics as experimental research and development of computational methods for the reinforced concrete and metal structures, strengthened with the use of polymer composite materials, as well as analysis of pipe-concrete structures with a shell made from either metal or polymer composite material. In conclusion, the article presents a number of new formulated tasks whose solution is of interest for transport construction.

Keywords: structural mechanics; bridge structures; aggressive environment; deformation models; pavement; expansion joints; reinforced constructions; degradation of the reinforced concrete structures; pipe-concrete; polymer composite materials

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