Development of a simplified design method to predict the fire rating of LSF walls

Gunalan, Shanmuganathan & Mahendran, Mahen (2013) Development of a simplified design method to predict the fire rating of LSF walls. In Research and Applications in Structural Engineering, Mechanics and Computation: Proceedings of the Fifth International Conference on Structural Engineering, Mechanics and Computation (SEMC 2013), CRC Press/Balkema , Cape Town, South Africa.

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Recent fire research into the behaviour of light gauge steel frame (LSF) wall systems has devel-oped fire design rules based on Australian and European cold-formed steel design standards, AS/NZS 4600 and Eurocode 3 Part 1.3. However, these design rules are complex since the LSF wall studs are subjected to non-uniform elevated temperature distributions when the walls are exposed to fire from one side. Therefore this paper proposes an alternative design method for routine predictions of fire resistance rating of LSF walls. In this method, suitable equations are recommended first to predict the idealised stud time-temperature pro-files of eight different LSF wall configurations subject to standard fire conditions based on full scale fire test results. A new set of equations was then proposed to find the critical hot flange (failure) temperature for a giv-en load ratio for the same LSF wall configurations with varying steel grades and thickness. These equations were developed based on detailed finite element analyses that predicted the axial compression capacities and failure times of LSF wall studs subject to non-uniform temperature distributions with varying steel grades and thicknesses. This paper proposes a simple design method in which the two sets of equations developed for time-temperature profiles and critical hot flange temperatures are used to find the failure times of LSF walls. The proposed method was verified by comparing its predictions with the results from full scale fire tests and finite element analyses. This paper presents the details of this study including the finite element models of LSF wall studs, the results from relevant fire tests and finite element analyses, and the proposed equations.

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ID Code: 60677
Item Type: Conference Paper
Refereed: Yes
Funders: ARC
Keywords: Simplified design method, fire rating, LSF walls, steel stud, cold-formed steel
ISBN: 978-1-138-00061-2
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Please consult the authors
Deposited On: 11 Jun 2013 04:05
Last Modified: 09 Oct 2014 18:11

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