On the Influence of the Support Contour Beam on the Stress-Strain State of Beams of Straight Coffered Reinforced Concrete Floors

Mozgolov, M. V.; Bryl, S V; Kozlova, E.

doi:10.55287/22275398_2022_2_31

Cited by 2 publications

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“…Поперечное сечение балок опорного контура принято аналогично пролетным балкам, но с половинным значением ширины полки. По причине отсутствия информации в работах [2,3] об изменении модуля упругости бетона компьютерный расчет выполнялся как без коэффициентов редуцирования начального модуля упругости бетона, учитывающих ползучесть бетона и его трещинообразование [25], так и с коэффициентом 0,2 для всех балок, как пролетных изгибаемых, так и опорных по причине возникновения в них значительных крутящих моментов [23,24]. Изменение модуля упругости бетона не привело к изменению усилий в конструкции, но увеличило ее прогиб в 5 раз, с 9,49 мм до 47,43 мм.…”

Section: Introductionunclassified

Verification of Scad Models of Reinforced Concrete Coffered Floor Based on an Analytical Calculation Method That Takes Into Account Spans and Structural Rigidity

Mozgolov

Kozlova

2022

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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In accordance with the modern requirements of urban planning legislation, the design of building structures without the use of BIM technologies is impossible. Strength calculation on an electronic computer is carried out in software complexes implementing the finite element method, in which the forces or stresses calculated in the elements may turn out to be unreliable. There is a number of reasons for this. Analysis of the data of analytical and computer calculations of reinforced concrete coffered structures shows that the forces in the beams may differ significantly depending on the created finite element model and the geometry of the overlap. The work is aimed to find out the most accurate finite element model when calculating reinforced concrete coffered floor. The numerical experiment is based on the work of verification calculations performed in the computing system SCAD of a rectangular overlap with rectangular coffers, modeled by four finite element models. It is concluded that the model consisting of shell finite elements is the most accurate. It addition, the stress obtained is compared with the data of the well-known analytical method for calculating coffered ceilings, which is based on the beam analogy and takes into takes into account only the spans of the structure. In this paper, the analytical calculation of the caisson overlap is carried out both taking into account the spans of the structure and its orthogonal rigidity. The calculation is also performed in the computing system SCAD on a model consisting of rod finite elements of a T-section. The results allow to conclude that the most accurate finite elements models is the bar models. Shell finite element models in the example under consideration show understated results. When performing verification calculations on a computer by the finite element method, in order to confirm the reliability of the stress –strain state obtained, it is necessary to compare with the data of full-scale or model tests of structures. For complex, repeatedly statically indeterminate systems for which there is no an analytical solutions, other methods of studying the convergence of the obtained FEM results have an error.

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Section: Introductionunclassified

Verification of Scad Models of Reinforced Concrete Coffered Floor Based on an Analytical Calculation Method That Takes Into Account Spans and Structural Rigidity

Mozgolov

Kozlova

2022

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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About errors of the example of calculation of a reinforced concrete casson floor panel in the designer's handbook

Mozgolov

2023

Urban construction and architecture

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The construction industry of the Russian Federation in the near future expects a full-scale transition to information modeling (BIM) technologies. The calculation of building structures is carried out using models in software systems based on the finite element method, which is not accurate. To substantiate the reliability of the obtained FEM data in accordance with the requirements of regulatory documents, it is necessary to verify and validate the calculation models, to perform an engineering assessment of the results by comparison with the reference value obtained experimentally or analytically. Generally accepted analytical solutions are given in the designer's handbooks. The paper considers an example of the calculation of a reinforced concrete coffered floor from the designer's reference book. It has been proved by a refined analytical method and computer calculation that when determining the forces in beams, the calculation example has four errors, one of which is fundamental, embedded in the well-known analytical method for calculating caisson structures. It consists in the fact that when determining the loads on orthogonal beams, the rigidity of the structure is not taken into account.

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On the Influence of the Support Contour Beam on the Stress-Strain State of Beams of Straight Coffered Reinforced Concrete Floors

Cited by 2 publications

References 0 publications

Verification of Scad Models of Reinforced Concrete Coffered Floor Based on an Analytical Calculation Method That Takes Into Account Spans and Structural Rigidity

Verification of Scad Models of Reinforced Concrete Coffered Floor Based on an Analytical Calculation Method That Takes Into Account Spans and Structural Rigidity

About errors of the example of calculation of a reinforced concrete casson floor panel in the designer's handbook

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