ABSTRACT
The slab in Fig. 3.1.1 is simply supported with a uniform load of 9 kN/m". The lines of zero shear force are chosen as shown in the fi gure in accordance with the rules given in Section 2.2. The average span moment in the x-direction is, Eq. (2.4):
The average span moment in the y-direction is, Eq. (2.5):
9 x 2 . 2 2 ( 6 . 5 + 2 x 2 . 5 ) m f - = 12.84 (3.2)
yf 6 x 6 . 5
The lateral distribution of design moments follows the general recommendations in Section 2.4.2. Thus, for example, we may choose to have moments in the side strips which are half those in the central strip (and with distances between bars twice as large). I f we choose
the widths of the side strips to 1.1 m in both directions, we get in the central strips, Eq (2.20):
HI - 6.0
X o 9 oo _ + 0 . 5 ( 1 - — ) 4.4 v 4 .4 )
12.84 my= 43 4 3 ~
- 5 + 0 . 5 ( l - l £ )
= 15.46 (3.4)
6.5 x 6.5^
This moment distribution is illustrated in Fig. 3.1.2.
