Modeling the Operation of Reinforced Concrete Structures Taking Into Account the Combined Action of Mechanical Loads and Aggressive Media

Selyaev, V.P.; Selyaev, Pavel Vladimirovich; Kechutkina, E.L.; Babushkina, D.R.; Gryaznov, S.I.

doi:10.51608/26867818_2021_1_19

ЭТП

2021

DOI: 10.51608/26867818_2021_1_19

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Modeling the Operation of Reinforced Concrete Structures Taking Into Account the Combined Action of Mechanical Loads and Aggressive Media

V.P. Selyaev

Pavel Vladimirovich Selyaev

E.L. Kechutkina

et al.

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2024

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“…Building materials and structures throughout the entire life cycle are exposed to the damaging effects of various aggressive environments. In accordance with the second law of thermodynamics, the process of degradation of a highly ordered structured system is irreversible and develops for the worse -from order to disorder [1]. In the case of uncontrolled accumulation of damage, this leads to premature onset of limit states.…”

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confidence: 97%

Forecasting the Durability of Composite Materials Products under the Combined Action of Mechanical Loads and Chemically Aggressive Media

Selyaev¹,

Selyaev²

2022

J Chem & its Appli

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Structures made of composite materials with a complex structure during operation are subjected to the combined effects of mechanical loads and aggressive media, which initiate the accumulation of damage in the material. As a result, premature destruction of structures, buildings, structures are possible. To prevent emergencies, it is necessary to be able to assess the resource of structures at any time. The article analyzes the previously proposed methodology of mathematical modeling of degradation processes, calculation and prediction of durability, resource structures, based on the application of the fundamental laws of mechanics of deformable solids and physico-chemical kinetics. The mechanisms of degradation of composites, methods of experimental determination of the main degradation parameters, conditions for calculating the durability of two groups of limit states are considered.

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mentioning

confidence: 97%

Forecasting the Durability of Composite Materials Products under the Combined Action of Mechanical Loads and Chemically Aggressive Media

Selyaev¹,

Selyaev²

2022

J Chem & its Appli

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Forecasting the life cycle of reinforced concrete structures in severe climatic conditions

Pinus

2024

jour

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The article considers the problem of design forecasting of the life cycle of reinforced concrete structures operated in severe climatic conditions using the methodology of limit states. The authors propose to use the reliability index β, conditionally regulated by the norms for design limit states, as a criterion index of the functional suitability of structures. The kinetics of the reliability index β during cyclic freezing and thawing is evaluated by means of multifactor periodic experimental control of strength and deformability indices in frozen and thawed states. Testing was conducted using prismatic (100×100×400 mm) and cubic (100 mm) specimens of the B25 mature concrete (180 days), F270 frost resistance grade. In this case, the parametric failure of an element was identified by the moment when the criterion parameter reached the threshold value. The threshold is extablished (with the required level of reliability) by normative functional models of the limit state, transformed to a form describing the dependence of the concrete resistance parameter on the value of the estimated force and section parameters. Test intervals were determined considering the specificity of concrete frost degradation as a multistage process of structural adaptability, as well as microcrack formation and accumulation. Statistical aspects of resistance parameters were identified from experimental data using the maximum likelihood method and Pearson’s criterion (χ2) in assessing their consistency with the theoretical distribution. Additional transient design situations that consider the thermal-moisture state of the structures are considered. The presented experimental data confirmed the feasibility of the proposed approach.

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Predicting the residual life of concrete structures in biocorrosion from the position of the theory of mass transfer

Fedosov

Loginova

Shalygina

2022

Struct. Mech. of Eng. Const. and Build

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The problem of corrosive destruction of concrete and reinforced concrete structures of industrial buildings affected by aggressive environments does not lose its relevance, because, despite the abundance of modern methods of protection, there are still no radical methods of corrosion control. Corrosive destruction of building materials leads to a strength and load-bearing capacity reduction, loss of aesthetic properties of concrete and reinforced concrete structures and, consequently, to a decrease in the residual life of buildings and structures. The biological factor often acts as an intensifier of corrosive destruction. In this regard, it is reasonable to search for the possibility of predicting the durability of concrete and reinforced concrete structures in aggressive liquid mediums, taking into account the biofactor effect from the standpoint of mass transfer theory. The authors present a model of mass transfer in a concrete structure exposed to aggressive environment and biofouling. The proposed physical and mathematical model considers the properties of concrete and aggressive environment, as well as the kinetics of continuous processes of growth, reproduction and death of microorganisms. The results of numerical experiments on the proposed mathematical model are provided. The application of the received solutions will allow timely monitoring of biocorrosive destruction of concrete and reinforced concrete structures and selecting effective methods of protection.

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Modeling the Operation of Reinforced Concrete Structures Taking Into Account the Combined Action of Mechanical Loads and Aggressive Media

Cited by 3 publications

References 0 publications

Forecasting the Durability of Composite Materials Products under the Combined Action of Mechanical Loads and Chemically Aggressive Media

Forecasting the Durability of Composite Materials Products under the Combined Action of Mechanical Loads and Chemically Aggressive Media

Forecasting the life cycle of reinforced concrete structures in severe climatic conditions

Predicting the residual life of concrete structures in biocorrosion from the position of the theory of mass transfer

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