Use M30 concrete & Fe415 steel. Use Working Stress

approach. The permissible stress in steel under direct tension is 130 MPa. The permissible stress in concrete under direct tension is 1.5 MPa. The following table can be referred to fix the thickness of the tank wall or, alternate approaches can be adopted. Draw reinforcement details. Use Working Stress approach.

Thickness of Members in Direct Tension (Uncracked Condition).

Ans:

Given,

$D=13 \mathrm{m}$

$H=5 m$

$6_{at}=1.5 N/mm^2$

$6_{st}=130 N/mm^2$

1) Volume of tank = $\pi R^2 H$

D=13m

$\therefore R = 6.5m $

$V= \pi \times6.5^2\times 5$

$V=663.66 m^3$

2) Hoop tension

$T=\frac{Lrw \times H \times D}{2}$

$T=\frac{10 \times 5 \times 13}{2}$

$T=325 \ KN$

3) Horizontal reinforcement

$A_{st}= …