Steel Buildings in Europe

Part 7: Fire Engineering 7 - 41 beam purlin fire wall protected column purlin fire wall protected column fire protection d  200 mm beam a) Wall inserted between the flanges of columns b) Wall fixed to one flange of columns Figure 5.17 Design detail near fire walls perpendicular to portal steel frame Fire wall parallel to steel frame Figure 5.18 illustrates the situation where the fire wall is parallel to the steel frame. For this situation:  The fire wall either be located between two frames or in the plane of the frame, between faces of the columns and beams.  Columns and beams that within the fire wall or near a fire wall must be fire protected.  Purlins will cross the fire walls. It is therefore necessary to fire protect continuous purlins (over a distance of 200 mm from the wall) or to design a non-continuous purlin system. For example, where fire wall is in the plane of a frame, steel elements fixed to the beams should be inserted through the wall to support the purlins. The thickness of fire protection material applied to columns and beams may be calculated assuming a critical temperature of 500°C and the same required fire resistance as the fire walls. Fire protection should be provided over the full height of columns.