Development of improved fire design rules for cold-formed steel wall systems

Gunalan, Shanmuganathan & Mahendran, Mahen (2013) Development of improved fire design rules for cold-formed steel wall systems. Journal of Constructional Steel Research, 88, pp. 339-362.

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Traditionally the fire resistance rating of LSF wall systems is based on approximate prescriptive methods developed using limited fire tests. Therefore a detailed research study into the performance of load bearing LSF wall systems under standard fire conditions was undertaken to develop improved fire design rules. It used the extensive fire performance results of eight different LSF wall systems from a series of full scale fire tests and numerical studies for this purpose. The use of previous fire design rules developed for LSF walls subjected to non-uniform elevated temperature distributions based on AISI design manual and Eurocode3 Parts 1.2 and 1.3 was investigated first. New simplified fire design rules based on AS/NZS 4600, North American Specification and Eurocode 3 Part 1.3 were then proposed in this study with suitable allowances for the interaction effects of compression and bending actions. The importance of considering thermal bowing, magnified thermal bowing and neutral axis shift in the fire design was also investigated. A spread sheet based design tool was developed based on the new design rules to predict the failure load ratio versus time and temperature curves for varying LSF wall configurations. The accuracy of the proposed design rules was verified using the test and FEA results for different wall configurations, steel grades, thicknesses and load ratios. This paper presents the details and results of this study including the improved fire design rules for predicting the load capacity of LSF wall studs and the failure times of LSF walls under standard fire conditions.

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ID Code: 60676
Item Type: Journal Article
Refereed: Yes
Funders: ARC
Keywords: Fire design rules, Light gauge steel frame walls, Studs, Non-uniform temperatures, Thermal bowing, Neutral axis shift, Magnification effects
DOI: 10.1016/j.jcsr.2013.05.021
ISSN: 0143-974X
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
Deposited On: 11 Jun 2013 02:35
Last Modified: 20 Oct 2016 22:35

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