310
Structure: Generic Design Options
312
GENERIC DESIGN OPTIONS
The four systems described below are options for the framing of the
service modules exclusive of the service bays. The service bays and the
shear elements will typically be cast-in-place concrete, though steel may
be used in conjunction with Option 2.
312.1
PRESTRESSED CONCRETE BEAMS, CAST-IN-PLACE
Columns, girders and slabs are cast-in-place reinforced concrete. Beams
are post-tensioned pan joists. Under most conditions this system will give
the lowest first cost.
312.2
STEEL
Columns, girders and beams are steel. Slab is cast-in-place reinforce
concrete. Beams are in composite action with the slab. In some cases,
the shorter erection time of steel may offset its higher labor and material
cost.
312.3
PRESTRESSED CONCRETE BEAMS, PRECAST
Columns and girders are reinforced concrete, either precast or cast-in-
place. Beams are precast, prestressed concrete. Slab is cast-in-place
reinforced concrete. Precast members will be appropriate only for a
limited range of situations. They should be considered when spans are
relatively short and building height is relatively low. Precast columns and
girders are not recommended in high seismic load zones.
312.4
REINFORCED CONCRETE, CAST-IN-PLACE
Columns, girders, beams and slab are cast-in-place reinforced concrete.
This system may be applicable for the shorter spans, but the depths
required to control deflections in general make it undesirable.
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