Steel Buildings in Europe

Part 7: Fire Engineering 7 - 46 snow load and ψ 1 is the frequent combination factor according given in the relevant National Annex to EN 1990.  Where the fire wall is fixed to one flange of the columns, the elements of bracing systems must be fixed to rigid steel elements supporting the purlins on the side of the wall. Fire wall Building end Doubling of additional bracing system put at the end of fire wall Bracing system for normal temperature Building end Wall perpendicular to steel frame Fire wall Bracing system Wall parallel to steel frame Figure 5.23 Recommendations for bracing system 5.6.5 Recommendations for roof systems above the separation elements The roof should be independent from one compartment to the next, adopting the following recommendations (see Figure 5.24 (a)):  Purlins should be provided either side of the fire wall.  The roof should be stopped on both sides of the fire wall  The roof should be provided with fire protection over a width of 2,50 m either side of the wall. Alternatively, the wall may be extended above the roof, up to a specific distance d (see Figure 5.24 (b)). National regulations may specify other special requirements for roof covering adjacent to fire walls. protected column Fire wall beam purlin roof with fireproof material  2x2,50m roof part of roof between purlins fire protection Protected column fire wall beam purlin roof d fire protection a) Roof with fireproof material b) wall above the roof Figure 5.24 Roof system above the separation elements