Numerical studies of gypsum plasterboard and MGO board lined LSF walls exposed to fire


Autoria(s): Rusthi, Mohamed; Keerthan, Poologanathan; Ariyanayagam, Anthony Deloge; Mahendran, Mahen
Contribuinte(s)

Fernando, Dilum

Teng, Jin-Guang

Torero, Jose L.

Data(s)

09/12/2015

Resumo

Fire resistance of cold-formed light gauge steel frame (LSF) wall systems is enhanced by lining them with single or multiple layers of wall boards with varying thermal properties. These wall boards are gypsum plasterboards or Magnesium Oxide (MgO) boards produced by different manufacturers. Thermal properties of these boards appear to show considerable variations and this can lead to varying fire resistance levels (FRL) for their wall systems. Currently FRLs of wall systems are determined using full scale fire tests, but they are time consuming and expensive. Recent research studies on the fire performance of LSF wall systems have used finite element studies to overcome this problem, but they were developed based on 1-D and 2-D finite element platform capable of performing either heat transfer or structural analysis separately. Hence in this research a 3-D finite element model was developed first for LSF walls lined with gypsum plasterboard and cavity insulation materials. Accurate thermal properties of these boards are essential for finite element modelling, and thus they were measured at both ambient and elevated temperatures. This experimental study included specific heat, relative density and thermal conductivity of boards. The developed 3-D finite element model was then validated using the available fire tests results of LSF walls lined with gypsum plasterboard, and is being used to investigate the fire performance of different LSF wall configurations. The tested MgO board exhibited significant variations in their thermal properties in comparison to gypsum plasterboards with about 50% loss of its initial mass at about 500 ºC compared to 16% for gypsum plasterboards. Hence the FRL of MgO board lined LSF wall systems is likely to be significantly reduced. This paper presents the details of this research study on the fire performance of LSF wall systems lined with gypsum plasterboard and MgO board including the developed 3-D finite element models, thermal property tests and the results.

Identificador

http://eprints.qut.edu.au/91623/

Publicador

The University of Queensland

Relação

http://plse2015.org/cms/USB/pdf/full-paper_4439.pdf

Rusthi, Mohamed, Keerthan, Poologanathan, Ariyanayagam, Anthony Deloge, & Mahendran, Mahen (2015) Numerical studies of gypsum plasterboard and MGO board lined LSF walls exposed to fire. In Fernando, Dilum, Teng, Jin-Guang, & Torero, Jose L. (Eds.) Proceedings of the Second International Conference on Performance-based and Life-cycle Structural Engineering (PLSE 2015), The University of Queensland, Brisbane, Qld, pp. 1077-1084.

Direitos

Copyright 2015 The University of Queensland & The Hong Kong Polytechnic University.

Fonte

School of Civil Engineering & Built Environment; Science & Engineering Faculty

Palavras-Chave #Thermal finite element model #Thermal properties #Gypsum plasterboard #MgO board #Fire performance
Tipo

Conference Paper