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Open AccessArticle

Numerical Modelling of Thermal Insulation of Reinforced Concrete Ceilings with Complex Cross-Sections

1
Department of Building Structures, Silesian University of Technology, ul. Akademicka 5, 44-100 Gliwice, Poland
2
Department of Production Management, Czestochowa University of Technology, Armii Krajowej 19, 42-200 Częstochowa, Poland
3
Institute of Economics, The Great Poland University of Social and Economics in Środa Wlkp., Surzyńskich 2, 63-000 Środa Wlkp, Poland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(8), 2642; https://doi.org/10.3390/app10082642
Received: 23 March 2020 / Revised: 7 April 2020 / Accepted: 8 April 2020 / Published: 11 April 2020
(This article belongs to the Special Issue Health Structure Monitoring for Concrete Materials)
The article describes the results of numerical analyses and traditional calculations of the heat transfer coefficient in ceilings with a complex cross-section, and with materials of varying density built-in inside the cross-section. Prefabricated prestressed reinforced concrete, composite reinforced, and ribbed reinforced concrete ceilings were analyzed. Traditional calculations were carried out in accordance with the EN ISO 6946:2017 standard, while the numerical analyses were carried out in a program based on the finite element method (FEM). It has been shown that calculations can be a good alternative to nondestructive testing (NDT) and laboratory tests, whose use in the case of ceilings with different geometries is limited. The differences between the calculations carried out in accordance with EN ISO 6946:2017, and the results of numerical analyses are 12%–39%. The way the air voids are taken into account has an impact on the calculation results. In the traditional method, an equivalent thermal conductivity coefficient was used, while in the numerical analysis, the coefficient was selected from the program’s material database. Since traditional calculations require simplifications, numerical methods should be considered to give more accurate results. View Full-Text
Keywords: numerical modelling; reinforced concrete ceilings; thermal insulation; heat transfer coefficient numerical modelling; reinforced concrete ceilings; thermal insulation; heat transfer coefficient
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Drobiec, Ł.; Wyczółkowski, R.; Kisiołek, A. Numerical Modelling of Thermal Insulation of Reinforced Concrete Ceilings with Complex Cross-Sections. Appl. Sci. 2020, 10, 2642.

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