Flat Slab Floor System
Flat Slab Floor System
Flat Slab Floor System
09 December 2014
A flat slab is a two-way reinforced concrete slab that usually does not have beams and girders,
and the loads are transferred directly to the supporting concrete columns.
The column tends to punch through the slab in Flat Slabs, which can be treated by three methods:
a. Using a drop panel and a column capital in flat slab
b. Using a drop panel without a column capital in flat slab
c. Using a column capital without drop panel in flat slab
Column heads reduce the clear or effective span, and therefore, reduce the moment in the
flat slab floor
BENEFITS
Flexibility in room layout
Saving in building height
Shorter construction time
Ease of installation of M&E services
Prefabricated welded mesh
Buildable score
FLEXIBILITY IN ROOM LAYOUT
allows Architect to introduce partition walls anywhere required
allows owner to change the size of room layout
allows choice of omitting false ceiling and finish soffit of slab with skim coating
BUILDABLE SCORE
allows standardized structural members and prefabricated sections to be integrated into the design for ease of
construction
this process will make the structure more buildable, reduce the number of site workers and increase the
productivity at site
more tendency to achieve a higher Buildable score
he principal features of a flat slab floor are a flat soffit, simple formwork and easy construction. The economical span L of a reinforced concrete flat
slab is approximately D x 28 for simply supported, D x 32 for an end span and D x 36 for an interior span. Prestressing the slab increases the
economical span to D x 35, D x 40 and D x 45 respectively, where D is
the depth of the slab excluding the drop panel.
Simple formwork
Medium spans
For reinforced flat slabs, deflection at the middle strip may be critical.
Standard sizes
2
3
4