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1.7.7 Composite Beams and Composite Decks
There are two methods in STAAD for specifying composite beams.
Composite beams are members whose property is comprised of an
I-shaped steel cross section (like an American W shape) with a
concrete slab on top. The steel section and concrete slab act
monolithically. The two methods are:
a) The EXPLICIT definition method – In this method, the
member geometry is first defined as a line. It is then assigned
a property from the steel database, with the help of the ‘CM’
attribute. This method is described in Section 5.20.1 of this
manual. Additional parameters like CT (thickness of the slab),
FC (concrete strength), CW (effective width of slab), CD
(concrete density), etc., some optional and some mandatory,
are also provided.
Hence, the responsibility of determining the attributes of the
composite member, like concrete slab width, lies upon the
user. If the user wishes to obtain a design, additional terms
like rib height, rib width, etc. also have to be separately
assigned with the aid of design parameters. Hence, some
amount of effort is involved in gathering all the data and
assigning them.