Superposition principle as the fundamental error of the creep theory and standards of the reinforced concrete

Sanzharovskiy, Rudolf S.; Сергеевич, Санжаровский Рудольф; Ter-Emmanuilyan, Tatyana N.; Николаевна, Тер-Эммануильян Татьяна; Manchenko, Maxim M; Михайлович, Манченко Максим

doi:10.22363/1815-5235-2018-14-2-92-104

Cited by 8 publications

(11 citation statements)

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“…Remark 2. When in (11) we have 𝑘 1, a summand 𝐶 * 𝑡, 𝑡 σ 𝑡 0 and it is called short-term creep. Taking measure (11) with 𝑘 1, some authors [7] assume the inertia-free nature of the creep phenomenon, while other authors [8] (since the creep measure determines precisely delayed deformations), assuming the inertia in time of this phenomenon, take the creep measure (11) with 𝑘 1…”

Section: Rheological Equations Of Mechanical Statementioning

confidence: 99%

“…According to (16) 20) and (21) describe the same mechanical state of concrete, which was not noticed by the authors of [10]. This led to the statement [10] that the second component in ( 21) is unnecessary and to an incorrect representation of the superposition principle "as a fundamental error in the theory of creep" [11].…”

Section: Rheological Equations Of Mechanical Statementioning

confidence: 99%

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Relaxation of stress in elements of reinforced concrete structures

Larionov

Nazarenko²,

Rynkovskaya³

et al. 2022

Struct. Mech. of Eng. Const. and Build

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The calculation and prediction of the long-term safety of building structures is associated with the dynamics of the stress state of their composite elements and leads to relaxation problems for assessing the redistribution of stresses between the components that make up the structural element. In this study, reinforced concrete elements and the redistribution of stress from concrete to reinforcement are considered. To solve the corresponding relaxation problem an approach based on the concept of the strength structure of materials is proposed, which considers them as a union of their fractions (layers, fibers) with statistically distributed strengths. The loss of the ability of force resistance caused by loading by part of the fractions of the element entails a redistribution of stresses to its entire fractions. As a result of this, a nonlinear dependence of deformations on the design stresses arises, calculated under the assumption of equal strength of all fractions. For a material isotropic in strength, the relaxation problem is reduced to solving a linear integral equation conjugated with its linear rheological equation. The linear integral equation relatively structural stresses is reduced. After solving it, the desired stress is determined as the root of the algebraic equation connecting the structural and design stresses. The proposed approach significantly simplifies the obtaining of necessary for the long-term safety prediction of structures stress estimates in the components of structural elements.

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Section: Rheological Equations Of Mechanical Statementioning

confidence: 99%

Section: Rheological Equations Of Mechanical Statementioning

confidence: 99%

Relaxation of stress in elements of reinforced concrete structures

Larionov

Nazarenko²,

Rynkovskaya³

et al. 2022

Struct. Mech. of Eng. Const. and Build

View full text Add to dashboard Cite

show abstract

“…1). Moreover, in this particular scheme, an ideally elastoplastic material with an infinite yield area is considered, that is, it is outside the rules of Eurocode 2 and is an error for the reinforced concrete theory [8].…”

Section: а) B)mentioning

confidence: 99%

“…In the theory (s.5), which is a world theory, the Volterra integral equations representing the creep of concrete with its non-stationary and non-linear properties have fictitious nuclei that violate the envisaged mathematical order of their construction: as a result, concrete forms an erroneous set of fictitious forces that incorrectly form creep deformations [7][8][9][10].…”

Section: Erroneous Theory Of Concrete Linear Creepmentioning

confidence: 99%

General theory and foundations for calculating reinforced concrete structures of buildings and structures in modern construction

Sanjarovskiy

Sieber²,

Ter-Emmanuilyan

2021

E3S Web Conf.

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“…So the theory (s. 1) is just one of four lines -the boundaries of the region in the particular scheme of loading the elastoplastic stability -just one of many schemes in which there are no such boundaries at all (example, Figure 1). Moreover, in this particular scheme, an ideally elastoplastic material is considered, with an infinite yield area, that is, it is outside the rules of Eurocode 2 and is an error for the theory of reinforced concrete [13].…”

Section: The Features Of the Analyzed Theorymentioning

confidence: 99%

The theory of calculation of reinforced concrete structures and the principles of the Eurocode

Sanzharovskiy

Sieber²,

Ter-Emmanuilyan

2021

Struct. Mech. of Eng. Const. and Build

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The theory of calculating reinforced concrete is analyzed. As we known reinforced concrete with enormous volumes of application and huge financial costs, due to the great complexity of its nonlinear properties, has a surprisingly unscientific theory of calculation, consisting of two parts: short-term and longterm loading. The work of a number of round tables was devoted to the problem of errors in the theory of calculating reinforced concrete. The round tables held at the Peoples Friendship University of Russia (RUDN University) on the initiative and under the guidance of famous scientists: V.M. Bondarenko, S.N. Krivoshapko, V.V. Galishnikova (the last one took place in 2020) with a large number of participants of authoritative scientists from Russia and other countries. It is shown that the theory of calculation of reinforced concrete structures, which are widely used (with long-term loading all over the world), includes five inconsistent (among them erroneous) theories, the essence of which and one postulate are set further. Using the rules of mathematics, the principles of mechanics and the results of solid experiments, it was revealed that the analyzed theory contains a set of theories rejecting each other for various purposes, including erroneous ones.

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Superposition principle as the fundamental error of the creep theory and standards of the reinforced concrete

Cited by 8 publications

References 1 publication

Relaxation of stress in elements of reinforced concrete structures

Relaxation of stress in elements of reinforced concrete structures

General theory and foundations for calculating reinforced concrete structures of buildings and structures in modern construction

The theory of calculation of reinforced concrete structures and the principles of the Eurocode

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