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This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) 1292 Fire resistance STEELWORK IN FIRE INFORMATION SHEET This series of information sheets is intended to illustrate methods of achieving fire resistance in steel structures. It should not be used for design without consulting detailed design guidance referenced below. COMPOSITE SLABS WITH PROFILED METAL DECK UP TO 2 HRS WITH UNFILLED VOIDS METHOD In composite construction using profiled metal deck floors it is unnecessary to fill the deck voids above the top flange for any fire resistance period using dovetail deck, or up to 90 minutes using trapezoidal deck (see overleaf) PRINCIPLE In a composite beam/slab member the neutral axis in bending lies in, or close to, the beam top flange. Thus the top flange makes little significant contribution to the structural behaviour of the total composite system and it's temperature can be allowed to increase with little detriment to performance in fire. FOR MORE DETAILED INFORMATION SEE:- Technical Report 109 "Fire resistance of composite beams" The British Steel Construction Institute - (01344 23345) Voids may be left unfilled ADVANTAGES a) Saving in time on site b) Saving in cost for filling voids c) It is unnecessary to build up the full thickness of protection on toes of upper flange d) Void filling is unnecessary when using dovetail deck LIMITATIONS Voids must be filled where:a) Trapezoidal deck is used for fire ratings over 90 minutes b) Trapezoidal deck is used in non-composite construction c) Any type of deck crosses a fire separating wall Sheet Code ISF/No.06 January 1997
This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007 To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/ Steel Designers' Manual - 6th Edition (2003) TRAPEZOIDAL DECK Construction Composite Beams COMPOSITE BEAMS - UNFILLED VOIDS Fire Protection Fire Resistance (minutes) On Beam Up to 60 90 Over 90 BOARD No Increase Increase thickness* Fill voids or SPRAY in thickness* by 10% (or use thickness* appropriate to beam Hp/A + 15% whichever is less) INTUMESCENT Increase thickness* Increase thickness* Fill voids by 20% by 30% (or use thickness* (or use thickness* appropriate to appropriate to beam Hp/A + 30% beam Hp/A + 50% whichever is less) whichever is less) Non- Composite All types Fill voids Beams DOVETAIL DECK _____\__7 _______ Fire Protection Construction Fire Resistance (minutes) On Beam Composite or Non-composite All Types Beams Voids may be left unfilled for all fire resistance periods. Fire resistance 1293 Thickness is the board, spray or intumescent thickness given for 30, 60 or 90 minutes rating in Fire Protection for Structural Steel in Buildings" published by ASFP (01252 336318) and The Steel Construction Institute (01344 23345)
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