Thin-walled compressed steel constructions under fire load

The article demonstrates the both theoretical and actual fire resistance limits of the composite I-shaped and box-shaped thin-walled steel structures in compression conditions under the standard fire load. The calculation was based on the Eurocode 3 and finite element modeling of high-temperature fi...

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Autores principales:	Gravit Marina, Dmitriev Ivan
Formato:	article
Lenguaje:	EN
Publicado:	Peter the Great St. Petersburg Polytechnic University 2021
Materias:	steel construction thin walled structures cold-formed steel structural design fire fire safety fire protection fire design Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/895d4bd4e96a4ec590b8a24502c7d7f9
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id	oai:doaj.org-article:895d4bd4e96a4ec590b8a24502c7d7f9
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spelling	oai:doaj.org-article:895d4bd4e96a4ec590b8a24502c7d7f92021-11-12T15:54:05ZThin-walled compressed steel constructions under fire load2712-817210.34910/MCE.105.14https://doaj.org/article/895d4bd4e96a4ec590b8a24502c7d7f92021-09-01T00:00:00Zhttp://engstroy.spbstu.ru/article/2021.105.14/https://doaj.org/toc/2712-8172The article demonstrates the both theoretical and actual fire resistance limits of the composite I-shaped and box-shaped thin-walled steel structures in compression conditions under the standard fire load. The calculation was based on the Eurocode 3 and finite element modeling of high-temperature fields in SOFiSTiK PC. The experimental tests were carried out on the basis of design data to validate the results of both the calculation and modeling. It is shown that the static part of the calculation of the critical temperature, upon irreversible plastic deformations occur, is solved not completely correctly by means of regulations. In average the calculated critical temperature exceeds the actual one on 50-80°C. It is shown that the assumption of a critical temperature equals to 350 °C is unreasonably low. The complex graphs of the temperature growth for each steel construction are given according to the paragraphs of normative documents, the finite-element modeling and results of thermocouple indicators for the fire tests. The solution of thermophysical part of calculation according to Eurocode 3 showed good convergence with the results of the experimental data, including the samples with effective fire protection, but strongly depend on the step of calculation. The accurate results were reached only when the time step equals 1 sec. The finite element modeling predicted the correct time to achieve the critical temperature of the tested sample without any additional assumptions. The MBOR-16F material produced by TIZOL JSC was used as a flame protection. This is new material, which has not been previously studied yet. The recommendations on application of the finite element programs are given in the thermophysical part of the fire resistance calculation.Gravit MarinaDmitriev IvanPeter the Great St. Petersburg Polytechnic Universityarticlesteel constructionthin walled structurescold-formed steelstructural designfirefire safetyfire protectionfire designEngineering (General). Civil engineering (General)TA1-2040ENMagazine of Civil Engineering, Vol None, Iss 05 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	steel construction thin walled structures cold-formed steel structural design fire fire safety fire protection fire design Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	steel construction thin walled structures cold-formed steel structural design fire fire safety fire protection fire design Engineering (General). Civil engineering (General) TA1-2040 Gravit Marina Dmitriev Ivan Thin-walled compressed steel constructions under fire load
description	The article demonstrates the both theoretical and actual fire resistance limits of the composite I-shaped and box-shaped thin-walled steel structures in compression conditions under the standard fire load. The calculation was based on the Eurocode 3 and finite element modeling of high-temperature fields in SOFiSTiK PC. The experimental tests were carried out on the basis of design data to validate the results of both the calculation and modeling. It is shown that the static part of the calculation of the critical temperature, upon irreversible plastic deformations occur, is solved not completely correctly by means of regulations. In average the calculated critical temperature exceeds the actual one on 50-80°C. It is shown that the assumption of a critical temperature equals to 350 °C is unreasonably low. The complex graphs of the temperature growth for each steel construction are given according to the paragraphs of normative documents, the finite-element modeling and results of thermocouple indicators for the fire tests. The solution of thermophysical part of calculation according to Eurocode 3 showed good convergence with the results of the experimental data, including the samples with effective fire protection, but strongly depend on the step of calculation. The accurate results were reached only when the time step equals 1 sec. The finite element modeling predicted the correct time to achieve the critical temperature of the tested sample without any additional assumptions. The MBOR-16F material produced by TIZOL JSC was used as a flame protection. This is new material, which has not been previously studied yet. The recommendations on application of the finite element programs are given in the thermophysical part of the fire resistance calculation.
format	article
author	Gravit Marina Dmitriev Ivan
author_facet	Gravit Marina Dmitriev Ivan
author_sort	Gravit Marina
title	Thin-walled compressed steel constructions under fire load
title_short	Thin-walled compressed steel constructions under fire load
title_full	Thin-walled compressed steel constructions under fire load
title_fullStr	Thin-walled compressed steel constructions under fire load
title_full_unstemmed	Thin-walled compressed steel constructions under fire load
title_sort	thin-walled compressed steel constructions under fire load
publisher	Peter the Great St. Petersburg Polytechnic University
publishDate	2021
url	https://doaj.org/article/895d4bd4e96a4ec590b8a24502c7d7f9
work_keys_str_mv	AT gravitmarina thinwalledcompressedsteelconstructionsunderfireload AT dmitrievivan thinwalledcompressedsteelconstructionsunderfireload
_version_	1718430379741806592

Thin-walled compressed steel constructions under fire load

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