Steel Designers Manual - TheBestFriend.org

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Steel Designers' Manual - 6th Edition (2003)
51 mm
46 cm
225
vertical ribs
152 m
chevron indents
225m
circular indents
300 irmi
600 m
Fig. 20.2 Examples of modern composite deck profiles
Deck types 579
In the UK, spans of 3.5–3.75 m are achieved with profiles of typically 60 mm
depth.
Slimflor ® construction 2 has also led to the development of deep deck profiles of
210–225 mm depth and 1.0–1.25 mm thickness. The total slab depth of 280–310 mm
is such that the steel beam is fully encased in the slab except for its bottom flange.
The deep deck slab is designed for spans of 6 m when unpropped during construction,
or up to 7.5 m when propped. The beam may take the form of a universal
column section with a welded plate or three welded plates. Recent developments
by Corus have resulted in the rolling of asymmetric beams. 3 These are rolled with
a patterned top flange which enhances the composite action between the beam and
the overlying in situ concrete thus eliminating the need for welded shear connectors.
The rolled sections have webs of greater thickness than that of the flanges to
achieve superior fire resistance properties, and this extra web thickness also
enhances the torsional properties of the section.
The grades of steel used for decking are specified in BS EN 10147. 4 The common
grades in the UK are S280 and S350. Steel decking is usually galvanized to a standard
of 275 g/m 2 (roughly 0.04 mm per face), which gives adequate protection for
internal use.