1 Dr Guillermo Rein University of Edinburgh Travelling Fires in Structural Design 6 th Int Conf Fire Safety Eng APICI Madrid, Feb 2011 Contributions from J Stern-Gottfried, A Law, A Jonsdottir, M Gillie and J Torero Structural Design for Fire Safety Fire is a source of heat that weakens the structure Assessment of structural response to avoid collapse In order to determine structural detailing and fire protection requirements Enhancement of: Integral safety Robustness Safe innovation Cost savings
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Travelling Fires in Building Structural Design (Madrid 2011)
Presentation I gave on Travelling Fires at the 6th International Congress on Performance-Based Design for Fire, Madrid, on 24 Feb 2011. Relates paper are: - A Law, M Gillie, J Stern-Gottfried, G Rein, JL Torero, The Influence of Travelling Fires on a Concrete Frame, Engineering Structures, (in press) 2011. doi:10.1016/j.engstruct.2011.01.034
- A Jonsdottir, G Rein, J Stern-Gottfried, Comparison of Steel Temperatures using Travelling Fires and Traditional Methods: the Case Study of the Informatics Forum Building, Proceedings of the 12th International Interflam Conference, Nottingham, July 2010.
- A Jonsdottir, G Rein, Out of Range, Fire Risk Management, Dec 2009, pp. 14-17. http://hdl.handle.net/1842/3204
- J Stern-Gottfried, G Rein, JL Torero, Travel Guide, Fire Risk Management, Nov 2009, pp. 12-16. http://hdl.handle.net/1842/3184
- G. Rein, X. Zhang, P. Williams, B. Hume, A. Heise, A. Jowsey, B. Lane, and JL. Torero, “Multi-story Fire Analysis for High-Rise Buildings”, 11th Interflam, London, September 2007, p 605-616. http://hdl.handle.net/1842/3184
- J Stern-Gottfried, G Rein, L Bisby, JL Torero, Experimental Review of the Homogeneous Temperature Assumption in Post-Flashover Compartment Fires, Fire Safety Journal 45, pp. 249–261, 2010. doi:10.1016/j.firesaf.2010.03.007. http://hdl.handle.net/1842/3866
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Transcript
1
Dr Guillermo Rein
University of Edinburgh
Travelling Fires in
Structural Design
6th Int Conf Fire Safety Eng
APICI Madrid, Feb 2011
Contributions from J Stern-Gottfried, A Law,
A Jonsdottir, M Gillie and J Torero
Structural Design for Fire Safety
�Fire is a source of heat that
weakens the structure
�Assessment of structural
response to avoid collapse
� In order to determine structural
detailing and fire protection
requirements
�Enhancement of:� Integral safety
� Robustness
� Safe innovation
� Cost savings
2
GI -> GO
�Cold behaviour ≠ Hot behaviour
�Fire dynamics and resulting environment
are the input and boundary condition to
subsequent Fire & Structures Analysis
�If the input is incomplete, the
subsequent analysis cannot be
trusted
Traditional Methods
0
200
400
600
800
1000
1200
1400
0 30 60 90 120 150 180 210 240
Time (minutes)
Temperature (°C)
EC - Short
EC - Long
Standard
� Standard Fire ~1917
� Swedish Curves ~1972
� Eurocode Parametric Curve ~1995
3
Buildings are Different
Then… …and Now
� Architecture is always seeking out of bound
– higher, larger, new shapes
TraditionsTraditions
�Traditional methods assume uniform fires
that lead to uniform fire temperatures
�Traditional methods are based on
experiments conducted in small
compartment experiments (~3 m3)
�Traditional methods have been said to be
conservative (?)
Stern-Gottfried et al, Fire Risk Management 2009
4
Size MattersSurface Area to Volume Ratio vs Floor Area for a 3m High Square Compartment
0
0.5
1
1.5
2
2.5
3
0 500 1000 1500 2000 2500 3000
Floor Area (m²)
Sur
face
Are
a/V
olum
e (1
/m)
Fire Tests
Real Buildings
Stern-Gottfried et al, Fire Risk Management 2009
Limitations in Traditional Methods Limitations in Traditional Methods