Structural fire behaviour of HFC sections subjected to non-uniform temperature distributions

Kesawan, Sivakumar & Mahendran, Mahen (2016) Structural fire behaviour of HFC sections subjected to non-uniform temperature distributions. Journal of Structural Fire Engineering. (In Press)

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A typical Load-bearing Light gauge Steel Frame (LSF) wall is made of cold-formed lipped channel section studs, and fire protected on both sides by gypsum plasterboard layers. Recently, the authors investigated the use of different shaped stud sections, and recommended to use the Hollow Flange Channel (HFC) sections in LSF walls. Their full scale fire tests showed that LSF walls made of welded HFC sections/LiteSteel Beam (LSB) have superior fire performance in comparison to those made of LCS. However, still comprehensive fire performance data is not available on the LSF walls made of HFC studs as only few tests were conducted. To advance the use of HFC section studs, the effects of different parameters on the structural fire performance of HFC section studs must be known. To facilitate this, an extensive parametric study was performed to investigate the structural fire behaviour of HFC section studs subjected to non-uniform temperature distributions in LSF walls, using the developed and validated finite element models in ABAQUS. An idealised HFC stud with appropriate restraints and boundary conditions was used to simulate the end supports and plasterboard restraints while being subjected to an axial compression load. The effects of stud sizes including stud thickness and web depth, stud profiles, elevated temperature mechanical property reduction factors of steels, types of wall configuration, plasterboard to stud connectivity and realistic design fire curves were thoroughly evaluated. The load ratio versus Fire Resistance Rating (FRR) curves were produced for all the LSF walls considered which enabled an easier comparison between the different parameters. It was found that most of the above-mentioned factors had significant influence on the FRR of LSF walls, and by carefully choosing the suitable parameters, the fire performance of LSF walls can be greatly enhanced. Furthermore, this paper also evaluates the applicability of the critical hot and average temperature methods to predict the FRR of LSF walls made of HFC sections.

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ID Code: 96259
Item Type: Journal Article
Refereed: Yes
Keywords: LSF walls, Hollow flange channel sections, Fire resistance rating, Structural behaviour, Finite element modelling, Non-Uniform Temperature Distributions
ISSN: 2040-2317
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Civil Engineering not elsewhere classified (090599)
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 Multi-Science Publishing Co. Ltd
Deposited On: 19 Jun 2016 22:27
Last Modified: 23 Jun 2016 04:35

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