Steel Designers Manual - TheBestFriend.org

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Steel Designers' Manual - 6th Edition (2003)
70 Multi-storey buildings
• Services can be integrated between the decking ribs passing through webopenings
in the beam
• ASBs achieve composite action without the need for shear studs
• Rectangular hollow section edge beams provide good torsional resistance and
maintain the shallow floor depth
• Floor slabs can be used for fabric energy storage forming part of an environmentally
sustainable building solution.
Figure 2.27 illustrates a typical beam layout at the building perimeter.
Precast floor systems
Universal beams supporting precast prestressed floor units (Fig. 2.28) have some
advantages over other forms of construction. Although of heavier construction
than comparable composite metal deck floors, this system offers the following
advantages.
• Fewer floor beams since precast floor units can span up to 6–8 m without
difficulty.
• No propping is required.
• Shallow floor construction can be obtained by supporting precast floor units on
shelf angles or on wide plates attached to the bottom flanges of universal columns
acting as beams (Slimfloor).
• Fast construction because no time is needed for curing and the development of
concrete strength.
5 to 9 m
— — I
Ii
,i. ASB
Fig. 2.27 Slimdek ® floor arrangement
'1 deep
deck
fr span
RHSFB edge beam
5 to 9 m
-Ff1 column (UC or SHSI
tie
member