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Identification of the thermal properties of concrete for the temperature calculation of concrete slabs and columns subjected to a standard fire—Methodology and proposal for simplified formulations

  • The fire resistance of concrete members is controlled by the temperature distribution of the considered cross section. The thermal analysis can be performed with the advanced temperature dependent physical properties provided by 5EN6 1992-1-2. But the recalculation of laboratory tests on columns from 5TU6 Braunschweig shows, that there are deviations between the calculated and measuredThe fire resistance of concrete members is controlled by the temperature distribution of the considered cross section. The thermal analysis can be performed with the advanced temperature dependent physical properties provided by 5EN6 1992-1-2. But the recalculation of laboratory tests on columns from 5TU6 Braunschweig shows, that there are deviations between the calculated and measured temperatures. Therefore it can be assumed, that the mathematical formulation of these thermal properties could be improved. A sensitivity analysis is performed to identify the governing parameters of the temperature calculation and a nonlinear optimization method is used to enhance the formulation of the thermal properties. The proposed simplified properties are partly validated by the recalculation of measured temperatures of concrete columns. These first results show, that the scatter of the differences from the calculated to the measured temperatures can be reduced by the proposed simple model for the thermal analysis of concrete.show moreshow less

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Metadaten
Document Type:Article
Author: Marcus Achenbach, Tom LahmerORCiDGND, Guido MorgenthalORCiDGND
DOI (Cite-Link):https://doi.org/10.1016/j.firesaf.2016.12.003Cite-Link
URN (Cite-Link):https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20170331-30929Cite-Link
URL:http://www.sciencedirect.com/science/article/pii/S0379711216301965
Parent Title (English):Fire Safety Journal 87
Language:English
Date of Publication (online):2017/03/31
Year of first Publication:2017
Release Date:2017/03/31
Publishing Institution:Bauhaus-Universität Weimar
Institutes:Fakultät Bauingenieurwesen / Juniorprofessur Stochastik und Optimierung
Fakultät Bauingenieurwesen / Professur Modellierung und Simulation - Konstruktion
First Page:80
Last Page:86
Tag:Fire resistance; Parameter optimization; Sensitivity analysis; Thermal properties
GND Keyword:Sensitivitätsanalyse; Thermodynamische Eigenschaft
Dewey Decimal Classification:600 Technik, Medizin, angewandte Wissenschaften / 620 Ingenieurwissenschaften
BKL-Classification:56 Bauwesen / 56.03 Methoden im Bauingenieurwesen
56 Bauwesen / 56.12 Betonbau
Licence (German):License Logo Creative Commons 4.0 - Namensnennung (CC BY 4.0)