Basic principles in the theory of force and thermal force resistance of concrete
In the development of the ideas and approaches to the analysis of the force resistance of concrete of V.M. Bondarenko, the initial prerequisites for the model of the thermomechanical state of concrete under short-term sharp high-temperature exposure, characteristic of fire conditions, are formulated...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Peoples’ Friendship University of Russia (RUDN University)
2022-12-01
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| Series: | Structural Mechanics of Engineering Constructions and Buildings |
| Subjects: | |
| Online Access: | https://journals.rudn.ru/structural-mechanics/article/viewFile/33554/21728 |
| _version_ | 1811164477159112704 |
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| author | Viktor S. Fedorov Valery E. Levitsky Ekaterina A. Isaeva |
| author_facet | Viktor S. Fedorov Valery E. Levitsky Ekaterina A. Isaeva |
| author_sort | Viktor S. Fedorov |
| collection | DOAJ |
| description | In the development of the ideas and approaches to the analysis of the force resistance of concrete of V.M. Bondarenko, the initial prerequisites for the model of the thermomechanical state of concrete under short-term sharp high-temperature exposure, characteristic of fire conditions, are formulated. The separation of force deformations into components is carried out on the basis of the connection with the accumulation of damage in the structure of the material, based on the principle of independence of the limiting structural stresses from temperature and the mode of force action, which makes it possible to establish basic thermomechanical relationships and determine the deformation parameters of concrete operating under conditions of unsteady heating in a loaded state. Based on the extension of the hypothesis of entropy damping of nonequilibrium processes to the area of action of an active destructive factor, the principle of normalization was formulated and a kinetic equation was proposed, from the solution of which exponential dependences having a single structure were obtained, which make it possible to describe the basic temperature parameters of concrete, the relationship of stresses with deformations, and other nonlinear characteristics. The application of the proposed principles creates a reliable theoretical basis for describing the mechanisms of thermal resistance of concrete and greatly simplifies the modeling of the effect of high temperature on the properties of concrete in the practical implementation of methods for the numerical calculation of reinforced concrete structures. |
| first_indexed | 2024-04-10T15:22:58Z |
| format | Article |
| id | doaj.art-b87ff0b814eb493fa9e0d1641dd26f37 |
| institution | Directory Open Access Journal |
| issn | 1815-5235 2587-8700 |
| language | English |
| last_indexed | 2024-04-10T15:22:58Z |
| publishDate | 2022-12-01 |
| publisher | Peoples’ Friendship University of Russia (RUDN University) |
| record_format | Article |
| series | Structural Mechanics of Engineering Constructions and Buildings |
| spelling | doaj.art-b87ff0b814eb493fa9e0d1641dd26f372023-02-14T13:33:04ZengPeoples’ Friendship University of Russia (RUDN University)Structural Mechanics of Engineering Constructions and Buildings1815-52352587-87002022-12-0118658459610.22363/1815-5235-2022-18-6-584-59620969Basic principles in the theory of force and thermal force resistance of concreteViktor S. Fedorov0https://orcid.org/0000-0002-0906-716XValery E. Levitsky1https://orcid.org/0000-0002-9355-4488Ekaterina A. Isaeva2https://orcid.org/0000-0002-3864-662XRussian University of TransportRussian University of TransportRussian University of TransportIn the development of the ideas and approaches to the analysis of the force resistance of concrete of V.M. Bondarenko, the initial prerequisites for the model of the thermomechanical state of concrete under short-term sharp high-temperature exposure, characteristic of fire conditions, are formulated. The separation of force deformations into components is carried out on the basis of the connection with the accumulation of damage in the structure of the material, based on the principle of independence of the limiting structural stresses from temperature and the mode of force action, which makes it possible to establish basic thermomechanical relationships and determine the deformation parameters of concrete operating under conditions of unsteady heating in a loaded state. Based on the extension of the hypothesis of entropy damping of nonequilibrium processes to the area of action of an active destructive factor, the principle of normalization was formulated and a kinetic equation was proposed, from the solution of which exponential dependences having a single structure were obtained, which make it possible to describe the basic temperature parameters of concrete, the relationship of stresses with deformations, and other nonlinear characteristics. The application of the proposed principles creates a reliable theoretical basis for describing the mechanisms of thermal resistance of concrete and greatly simplifies the modeling of the effect of high temperature on the properties of concrete in the practical implementation of methods for the numerical calculation of reinforced concrete structures.https://journals.rudn.ru/structural-mechanics/article/viewFile/33554/21728calculation model prerequisitesinvariantsstructural stressesheating under loadelasticity coefficientkinetic equation |
| spellingShingle | Viktor S. Fedorov Valery E. Levitsky Ekaterina A. Isaeva Basic principles in the theory of force and thermal force resistance of concrete Structural Mechanics of Engineering Constructions and Buildings calculation model prerequisites invariants structural stresses heating under load elasticity coefficient kinetic equation |
| title | Basic principles in the theory of force and thermal force resistance of concrete |
| title_full | Basic principles in the theory of force and thermal force resistance of concrete |
| title_fullStr | Basic principles in the theory of force and thermal force resistance of concrete |
| title_full_unstemmed | Basic principles in the theory of force and thermal force resistance of concrete |
| title_short | Basic principles in the theory of force and thermal force resistance of concrete |
| title_sort | basic principles in the theory of force and thermal force resistance of concrete |
| topic | calculation model prerequisites invariants structural stresses heating under load elasticity coefficient kinetic equation |
| url | https://journals.rudn.ru/structural-mechanics/article/viewFile/33554/21728 |
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