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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) 592 Composite deck slabs Table 20.2 Simplified rules for fire resistance of composite deck slabs 12 (a) Trapezoidal profiles (depth not exceeding 60 mm) Max. Fire Sheet Slab depth (mm) Mesh span rating thickness size (m) (h) (mm) NWC LWC parallel to the decking are laterally supported only at transverse beam connections. All beams are laterally supported under positive moment in their composite state. 20.8 Other constructional features Minimum dimensions 2.7 1 0.8 130 120 A142 3.0 1 0.9 130 120 A142 11 /2 0.9 140 130 A142 3.6 1 1.0 130 120 A193 11 /2 1.0 140 130 A193 (b) Dovetail profiles (depth not exceeding 50 mm) Minimum dimensions Max. Fire Sheet Slab depth (mm) Mesh span rating thickness size (m) (h) (mm) NWC LWC 2.5 1 0.8 100 100 A142 11 /2 0.8 110 105 A142 3.0 1 0.9 120 110 A142 11 /2 0.9 130 120 A142 3.6 1 1.0 125 120 A193 11 /2 1.2 135 125 A193 In the role of the decking as formwork, shuttering at the edge of the slab and at large openings is usually in the form of light cold-formed channels which are attached by shot-fired pins or screws to the decking. Small openings can be formed by leaving ‘boxed out’ voids in the slab and the decking cut away once the concrete has gained adequate strength. Guidance should be sought from the decking manufacturer regarding the maximum dimensions of unreinforced holes. Additional reinforcement should be placed to redistribute the loads that would otherwise have been resisted by the composite slabs in this zone. 5 Propping of composite slabs is rarely used, but if so, it is important to ensure that the slab beneath can resist the self-weight and construction load of the slab being cast. This may be critical if the support slab has not gained its full strength for composite action. Timber spreaders should be used to avoid damage to the deck.
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) References to Chapter 20 1. British Standards Institution (1994) Structural use of steelwork in building. Part 4: Code of practice for design of floors with profiled steel sheeting. BS 5950, BSI, London. 2. Lawson R.M. & Mullet D.L. (1993) Slim Floor Construction Using Deep Decking. SCI, Ascot, Berks. 3. Lawson R.M., Mullet D.L. & Rackham J.W. (1997) Design of Asymmetric Slimflor ® Beams Using Deep Composite Decking. SCI, Ascot, Berks. 4. British Standards Institution (1992) Specification for continuously hot-dip zinc coated steel sheet and strip. Technical delivery conditions. BS EN 10147, BSI, London. 5. Couchman G.H., Mullet D.L. & Rackham J.W. (2000) Composite slabs and beams using steel decking: Best practice for design and construction. Metal Cladding & Roofing Manufacturers Association and the Steel Construction Institute, Ascot, Berks. 6. Bryan E.R. & Leach P. (1984) Design of Profiled Sheeting as Permanent Formwork. Construction Industry Research and Information Association (CIRIA) Technical Note 116. 7. Shuster R.M. (1976) Composite steel-deck concrete floor systems. Proc. Am. Soc. Civ. Engrs, J. Struct. Div., 102, No. ST5, May, 899–917. 8. British Standards Institution (1987) Fire tests on building materials and structures. Part 20: Method for determination of the fire resistance of elements of construction (general principles). BS 476, BSI, London. 9. Steel Construction Institute (SCI) (1988) Fire resistance of composite floors with steel decking. SCI, Ascot, Berks. 10. British Standards Institution (1990) Structural use of steelwork in building. Part 8: Code of practice for fire resistant design. BS 5950. BSI, London. 11. British Standards Institution (1985) Structural use of concrete. Part 2: Code of practice for special circumstances. BS 8110, BSI, London. 12. Construction Industry Research and Information Association (CIRIA) (1986) Data Sheet: Fire Resistance of Composite Slabs with Steel Decking. CIRIA Special Publication 42. A worked example follows which is relevant to Chapter 20. References 593
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