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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) 576 Worked examples The Steel Construction Institute Silwood Park, Ascot, Berks SL5 7QN Typical connection detail: Subject Chapter ref. ROAD BRIDGE Design code Made by RT Sheet no. BS 5450 Enlarged Detail A Checked by GWO For guidance on the detailed design of connections the reader should refer to Chapter 26. 19 9
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) Chapter 20 Composite deck slabs by MARK LAWSON and PETER WICKENS 20.1 Introduction 20.1.1 Form of construction Composite floor is the general term used to denote the composite action of steel beams and concrete or composite slabs that form a structural floor. Composite deck slabs, in this context, comprise profiled steel decking (or sheeting) as the permanent formwork to the underside of a concrete slab spanning between support beams. The decking acts compositely with the concrete under service loading. It also supports the loads applied to it before the concrete has gained adequate strength. A light mesh reinforcement is placed in the concrete. A cross-section through a typical composite slab is shown in Fig. 20.1. Shear-connectors are used to develop composite action between the concrete slab and steel beams (see also Chapter 21). The decking has a number of roles. It (1) supports the loads during construction (2) acts as a working platform (3) develops adequate composite action with the concrete (4) transfers in-plane loads by diaphragm action to vertical bracing or walls (in conjunction with the concrete topping) (5) stabilizes the beams against lateral buckling provided that the ribs run perpendicular to the beam or are at an angle of at least 45° to the beam (6) acts as transverse reinforcement to the composite beams (7) distributes shrinkage strains preventing serious cracking. In addition it has a number of advantages over precast or in situ concrete alternatives: (1) construction periods are reduced (2) decking is easily handled (3) attachments (e.g. ceiling hangers) can be made easily (4) openings can be formed 577
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