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Steel Designers Manual - TheBestFriend.org

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This material is copyright - all rights reserved. Reproduced under licence from The <strong>Steel</strong> Construction Institute on 12/2/2007<br />

To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.<strong>org</strong>/<br />

<strong>Steel</strong> <strong>Designers</strong>' <strong>Manual</strong> - 6th Edition (2003)<br />

TRAPEZOIDAL DECK<br />

Maximum Fire<br />

Span (m) Rating (h)<br />

FIRE RESISTANT COMPOSITE SLABS<br />

Minimum Dimensions<br />

Sheet Slab depth (mm) Mesh Size<br />

thickness NWC (2) LWC (3)<br />

2.7 1 0.8 130 120 A142<br />

3.0 1 0.9 130 120 Al 42<br />

1.5 0.9 140 130 A142<br />

2 0.9 155 140 A193<br />

3.6 1 1.0 130 120 A193<br />

1.5 1.2 140 130 A193<br />

2 1.2 155 140 A252<br />

DOVETAIL DECK __\7 51mm max<br />

Maximum Fire<br />

Span (m) Rating (h)<br />

2.5<br />

Minimum Dimensions<br />

Sheet Slab depth (mm) Mesh Size<br />

thickness NWC (2) LWC (3)<br />

1 0.8 100 100 A142<br />

1.5 0.8 110 105 A142<br />

3.0 1 0.9 120 110 A142<br />

1.5 0.9 130 120 A142<br />

2 0.9 140 130 A193<br />

3.6 1 1.0 125 120 A193<br />

1.5 1.2 135 125 A193<br />

2 1.2 145 130 A252<br />

1) Imposed load not exceeding 5kN/M2 (+ 1.7kN/m2 ceiling and services)<br />

2) NWC = Normal weight concrete<br />

3) LWC = Light weight concrete<br />

Fire resistance 1295<br />

NOTE: Minimum slab depths given in BS 5950 pan 8 are to safety the insulation criterion only. Figures given in the table above<br />

incorporate a strength criterion also and thus may exceed the minimum depth given in the code.

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