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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) 1294 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 METHOD Fire resistance of composite slabs up to 90 mins can be achieved using normal Al 42 mesh reinforcement. This can be increased to 120 mins if heavier mesh is used and the slab depth increased (see overIea. Other cases outside the limit overleaf can be evaluated by the "Fire Engineering Method" (See below) PRINCIPLE Mesh reinforcement, which is not designed to act structurally under normal conditions, makes a significant contribution to structural continuity in fire. FOR MORE DETAILED INFORMATION SEE:- SCI Technical Report 056 "Fire resistance of composite floors with steel decking". The Steel Construction Institute - (01344 23345) and CIRIA Special publication 42 CIRIA (0171 222 8891) Oob''c O5 OQ,oo$, TRAPEZOIDAL DECK A __________ _____ ADVANTAGES DOVETAIL DECK a) Standard mesh, without additional reinforcing bars, may be used b) No fire protection is required on the deck soffit LIMITATIONS a) Applies only to slabs designed to B55950 Part 4 b) Mesh overlaps should exceed 50 times bar diameters c) Mesh bar ductility should exceed 12% elongation in tension (to BS 4449) d) Mesh should lie between 20 & 45mm from slab upper surface e) Imposed load should not exceed 6.7kN/m2 (including finishes) Slab depth Slab depth Sheet Code ISF/No.07 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 Maximum Fire Span (m) Rating (h) FIRE RESISTANT COMPOSITE SLABS Minimum Dimensions Sheet Slab depth (mm) Mesh Size thickness NWC (2) LWC (3) 2.7 1 0.8 130 120 A142 3.0 1 0.9 130 120 Al 42 1.5 0.9 140 130 A142 2 0.9 155 140 A193 3.6 1 1.0 130 120 A193 1.5 1.2 140 130 A193 2 1.2 155 140 A252 DOVETAIL DECK __\7 51mm max Maximum Fire Span (m) Rating (h) 2.5 Minimum Dimensions Sheet Slab depth (mm) Mesh Size thickness NWC (2) LWC (3) 1 0.8 100 100 A142 1.5 0.8 110 105 A142 3.0 1 0.9 120 110 A142 1.5 0.9 130 120 A142 2 0.9 140 130 A193 3.6 1 1.0 125 120 A193 1.5 1.2 135 125 A193 2 1.2 145 130 A252 1) Imposed load not exceeding 5kN/M2 (+ 1.7kN/m2 ceiling and services) 2) NWC = Normal weight concrete 3) LWC = Light weight concrete Fire resistance 1295 NOTE: Minimum slab depths given in BS 5950 pan 8 are to safety the insulation criterion only. Figures given in the table above incorporate a strength criterion also and thus may exceed the minimum depth given in the code.
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