The Construction of the Diagrammatic Deformation Model for Calculating the Core Reinforced-Concrete Structures in Finite Increments under Joint Action of Load Increments and Variable by Cross Sections Low and Ultra Low Subzero Temperatures

Karpenko, N. I.; Karpenko, Sergey N.; KADIEV, D.Z.; MOISEENKO, G.A.

doi:10.4028/www.scientific.net/kem.887.665

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…Actual tasks are the followings: the establishment of mutual conformity of compressive strength grade of concrete in the edition of Russian and foreign regulatory documents; determination of unambiguous strains values at the diagrams base points by their normalized values approximation. The studies performed are important for improving the design models of reinforced concrete strength resistance [10,11,12] and the development of the survivability theory of structural systems of buildings and structures [13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Relation between Breaking Stresses in the Strength Calculations of Reinforced Concrete Elements under the Deformation Mode in the Edition of Russian and Foreign Regulatory Documents

Eryshev

2019

MSF

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Сorrespondence was established between the compressive strength grades of concrete numerically equal to the guaranteed compressive strength of a standard concrete cube and a standard concrete cylinder. Designated concrete resistances are assigned for the limiting states of the first group with a compressive strength grade of concrete. For the corresponding concrete grades, the reduction to unambiguous strains values at the base diagrams points is justified: at the top and at the end of the falling branch of the curvilinear diagrams. In accordance with the regulatory requirements, restrictions are imposed on the stress levels at the end of the falling diagrams branch at the maximum normalized strains values. Mathematical models establishing a uniform format for calculating single-valued strains values at base points of concrete diagrams have been developed taking into account accepted functional relations and the their assignment rules using the requirements documents tables. It is shown that with equal strains values and stresses at base points, analytical expressions describing diagrams recommended by requirement documents, different in their structure, give their identical outlines, the diagrams branches are the same. Relation between design models in the edition of Russian and foreign regulatory documents is correlated by the comparison of integral diagrams parameters and breaking stresses obtained with the calculation of reinforced concrete element under the deformation mode. As integral parameters of concrete deformation diagrams, it is recommended to use the areas bounded by diagrams branches and diagrams fineness coefficient. The diagram area for given values of the element curvature is equivalent to the magnitude of the breaking stress in the compressed concrete zone in the bent and compressed elements, and the stress diagram in outline corresponds to this diagram.

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Section: Introductionmentioning

confidence: 99%

Relation between Breaking Stresses in the Strength Calculations of Reinforced Concrete Elements under the Deformation Mode in the Edition of Russian and Foreign Regulatory Documents

Eryshev

2019

MSF

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“…Диаграмма (рис. 1,а) имеет пологую нисходящую ветвь и достаточно хорошо согласовывается с предложениями Н.И.Карпенко и Д.Р.Маиляна [1,4]. При t=4 получаем диаграмму с более крутой нисходящей ветвью (рис.…”

unclassified

“…1,б). Параметры a,b,c уравнения (2) принимаются равными: a=1/E b , b= 4 ). Надо отметить, что до уровня деформации ε R в вершине диаграммы практически одинаковы, разница составляет всего 2%.…”

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Calculation of the load-bearing capacity of the bent plates taking into account the diagrams of concrete deformation

Dzhankulaev,

Shogenov,

Likhov

et al. 2023

Vestn. Dagest. gos. teh. univ., Teh. nauki

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Objective. The influence of the nature of the descending branch of concrete compression and stretching diagrams on the ultimate load-bearing capacity of bent cross-section reinforced concrete structures under various loading conditions close to destruction according to the nonlinear finite element model is investigated.Method. The solution is performed by the finite element method in a physically nonlinear formulation using N.I.Karpenko's deformation theory. Deformation diagrams are used with different steepness of the descending branch. Calculations are performed by a step-by-step iterative method of successive loads on a layered model.Result. The results of numerical calculation of slab reinforced concrete elements under various conditions of physical nonlinearity of concrete are presented.Conclusion. The insignificant influence of the steepness of the descending branch on the load-bearing capacity of plate bendable structures has been found and the use of simplified diagram dependencies is fully justified for numerical calculations using a nonlinear model.

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The Construction of the Diagrammatic Deformation Model for Calculating the Core Reinforced-Concrete Structures in Finite Increments under Joint Action of Load Increments and Variable by Cross Sections Low and Ultra Low Subzero Temperatures

Cited by 2 publications

References 3 publications

Relation between Breaking Stresses in the Strength Calculations of Reinforced Concrete Elements under the Deformation Mode in the Edition of Russian and Foreign Regulatory Documents

Relation between Breaking Stresses in the Strength Calculations of Reinforced Concrete Elements under the Deformation Mode in the Edition of Russian and Foreign Regulatory Documents

Calculation of the load-bearing capacity of the bent plates taking into account the diagrams of concrete deformation

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