1964_BUILDING_(CONSTRUCTION)_REGULATIONS — Page 97

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

-COLUMŃ-

-MIDDLE | STRIP

STRIP

0-25 £2

ì 0-29 £2 0-25 L2

HALF -COLUMN- STRIP

0-25 £2

than

148. The minimum thickness 1, 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;

L

(d) for fully continuous interior panels with drops.

40

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

Shcaring stresses in flat slabs.

!