7. Calculation methods for mechanical strength

7.1 Simplified rules for calculating straight section properties

The standard proposes two simplified methods: the reduced cross-section method and the reduced properties method. For application in France, the National Annex has retained only the reduced cross-section method.

Reduced cross-section method

The effective cross-sectional area is obtained by reducing the initial cross-sectional area by the effective carbonization depth of _ef (figure 7 ) according to :
$d_{ef} = d_{char, n} + k_{0} d_{0}$

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Calculation methods for mechanical strength

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Bibliography

(1) - AMY (L.) - Les bases physico-chimiques de combustion de la cellulose et des matériaux ligneux - Cahier N° 45 du CTB (FCBA).
(2) - T.B. (FCBA) - Comportement du bois au feu - Cahier N° 74 du C.T.B.
...

Websites

Eurocode

http://eurocodes.jrc.ec.europa.eu

Eurocode 5 platform

http://www.plateforme-eurocode5.fr

Standards and norms

General rules. Part 1-2: General – Fire design of structures. Plus its National Annex. AFNOR. - NF EN 1995 - 2005-2007
Bases de calcul des structures, et complément A1. Plus son Annexe nationale. AFNOR. - NF EN 1990 - (2003-2006-2011)
Actions on structures. Part 1-2: General actions – Actions on structures exposed to fire. Plus its National Annex. AFNOR. - NF EN 1991-1-2 - (2003-2005-2007)
General...

Regulations

Construction Products Regulation (J.O. de l'Union Européenne le 04/04/2011).

http://www.rpcnet.fr/

Order of March 14, 2011 amending the modified order of March 22, 2004 relating to the fire resistance of products, construction elements and structures.

NOR : IOCE1107534A