6 glazzing

Page 1

Chapter 6

Glazing Response in Fires

Table of Contents

1. Introduction.............................................................................. 125 2. State of the Art ........................................................................ 125 2.1 Existing Computing Models ................................................. 126 2.2 Physical Characteristics of Glass.......................................... 127 2.3 Behaviour of Glazing in Enclosure Fire................................ 128 3. Theoretical Analysis of Glazing Response in Fire ..................... 128 3.1 Mechanical Stress Model: Pagni and Joshi’s Criterion ......... 129 3.2 Heat Transfer Model ............................................................ 130 3.2.1 Conductive Heat Transfer .............................................. 131 3.2.2 Convective Heat Transfer............................................... 131 3.2.3 Radiation Heat Transfer: Sincaglia and Barnett............. 133 3.2.4 Flame Emissivity............................................................ 134 3.2.5 View Factor from the Flame to the Opening.................. 134 3.2.5. Thermal Distribution in the Glass Body ....................... 135


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