PRESTRESS CONCRETE DESIGN
WELCOME TO THE PRESENTATION
ON FLAT PLATE
ID NO: 10.01.03.052
What Is FLATE PLATES
Flat Plates are concrete slabs
which are carried directly by
columns, without the use of
beams or girders..
Commonly used where spans
are not large (20 to 25 ft).
& also loads not particularly
heavy (60 to 100 Psf)
TWO WAY & FLAT PLATE
TWO WAY SLAB:
Slabs are resting on T-Beams.
Slab load transfer to the beams and then in to the
FLAT PLATE SLAB :
load is directly transferred to the columns
the shear is very critical at the area of
connection of slab with column (called punching
LITTLE CONFUSION REGARDING
FLAT PLATE & FLAT SLAB!!!!!!!!!!!!!
The flat plat is a slab of uniform thickness while in flat
slab there is thickened slab region in the vicinity of the
column that includes either drop panel or column
Figure: Drop Panel & Column Head
should be properly
detailed between the
columns and slabs.
Punching shear checks
are critical & vertical
should be detailed
Analysis (Moment Determination):
A method of frame analysis such as
moment distribution, or stiffness
method or a Computer.
2. A simplified method using the
moment & shear co-efficient Table.
STEPS OF FLAT PLATE SLAB DESIGN
DEAD & LIVE LOAD CALCULATION
MOMENT CALCULATION BY USING
TABLS & CO-EFFICIENTS
Figure: Design Moment &
Shears for flat plate floor
interior Panel C.
Another Important Aspect regarding flat
plate design is punching shear at the
columns which require supplementary
shear reinforcement, & transfer of
unbalanced moments to the column which
may require additional flexural bars in the
negative bending region of the column
The simplified Formwork.
Reducing the Story Height which makes it Economical.
There are no beams to obstruct light & circulation of air.
Less danger of concrete spalling & exposing reinforcement.
Loads due to higher thickness of plate elements as required to control
Stiffness & weight consideration in earthquake areas