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Thermal breakage of window glass in room fires conditions – Analysis of some important parameters

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Dembele, Siaka, Rosario, Ricardo A. F. and Wen, Jennifer X. (2012) Thermal breakage of window glass in room fires conditions – Analysis of some important parameters. Building and Environment, Volume 54 . pp. 61-70. doi:10.1016/j.buildenv.2012.01.009

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Official URL: http://dx.doi.org/10.1016/j.buildenv.2012.01.009

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Abstract

In a compartment fire, the breakage and possible fallout of a window glass has a significant impact on the fire dynamics. The thermal breakage of glass depends on various parameters such as glass type, edge shading, edges conditions and constraints on the glass. The purpose of the present study is to investigate some of the key parameters affecting the thermal breakage of window glass in fire conditions using a recently developed and validated computer tool. Fallout is not within the scope of this study. Different boundary conditions of the glass pane (unconstrained and constrained) subjected to fire radiant heat are investigated. The analysis shows that to prevent glass thermal breakage, it is important to provide enough spacing between the frame and glass pane to accommodate the thermal expansion, and constraints on the glass structure should be avoided. The zones where the glass is likely to crack first are shown. The study also quantifies the effects of glass edge conditions on its thermal breakage in fire conditions; such analysis has not been reported in the literature due to its complexity and the statistical nature of edge flaws. The results show that an ordinary float glass mostly used in windows, with the “as-cut” edge condition would break later and is stronger than a ground edge or polished edge glass for the scenarios investigated. The study demonstrates how a predictive tool could be employed for a better understanding of thermal breakage of window glass in fires and for design guidance.

Item Type: Journal Article
Divisions: Faculty of Science > Engineering
Journal or Publication Title: Building and Environment
Publisher: Pergamon
ISSN: 0360-1323
Official Date: 2012
Dates:
DateEvent
2012Published
Volume: Volume 54
Page Range: pp. 61-70
DOI: 10.1016/j.buildenv.2012.01.009
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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