1985 Ed.]
Building (Construction) Regulations
[CAP. 123
B 97
147. Flat slab panels shall be assumed to be divided into--
(a) a middle strip which shall run the full length of the panel symmetrical about the centre line of the panel and the width of the panel;
(b) a column strip which shall run the full length of the panel and consist of 2 adjacent quarter panel widths, 1 on each side of the column centre line,
as shown in Diagram 5.
5
DIAGRAM 5
Division of flat slab panels into column and middle strips
[Subsidiary]
Division of
panels in flat slab construction.
0.5 D
1
MID-SPAN AND
POSITION OF MAXIMUM POSITIVE
MOMENT
POSITION OF MAXIMUM
NEGATIVE MOMENT
1
I
HALF
-COLUMN-
-MIDDLE | STRIP
STRIP
0.25 L2
0.25 L2 0.25 L2
HALF -COLUMN- STRIP
0.25 L2
than
148. The minimum thickness t, of a flat slab shall be not less
(a) 125 mm;
Minimum thickness of flat slabs.
L.N. 294/76.
(b)
L
32
for end panels without drops:
(c)
L
36
for fully continuous interior panels without drops and for end panels with drops;
(d)
L
40
for fully continuous interior panels with drops.
whichever is the greatest.
149. (1) The critical sections for shear shall be assumed to be-
(a) at a distance from the column head or, when no column head is provided, from the column of the thickness of the drop, or, where no drop is provided, the thickness of the slab; and
Shearing stresses in flat slabs.