It has been brought to SCI’s attention that some users of P375 are misinterpreting which section of the document is relevant to the design of external steelwork. Section 3.4.2 Compartment fires – external members refers to Annex B of BS EN 1991-1-2¹ for the model describing the compartment fire conditions and the flames emanating from openings. The expressions in Section 3.4.2 are used in the calculation of the relevant radiative and connective heat fluxes. Design of external steelwork using these heat fluxes should be based on Annex B of BS EN 1993-1-2² as described in para. 220.127.116.11. of the same standard.
Section 3.3.2 External fire curve gives the nominal temperature-time curve intended for the outside of separating external walls as defined in para. 18.104.22.168 of BS EN 1991-1-2 and presented in para. 3.2.2 of the same standard. It is not intended for use in the design of external steel members.
Contact: Richard Henderson
Tel: 01344 636555
1. BS EN 1991-1-2:2002 Eurocode 1: Actions on structures Part 1-2: General actions – Actions on structures exposed to fire
2. BS EN 1993-1-2:2005 Eurocode 3: Design of steel structures – Part 1-2: General rules – Structural fire design
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