What is hoop tension

Design Procedure for Circular Water tank

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7 step design procedure for RCC Circular Water Tank

In our previous article, we discussed some important theory and formulas required in the design procedure of Circular Water Tank.

Refer: Important theory and formula derivation for Circular Water Tank

 

Circular Water tank

We will now move on with the stepwise design procedure for Water tank design.

Step One

Determine the design constants such as σcbc, σct, m, σst

Where,

σcbc = permissible compressive stress in concrete

σct = permissible tensile stress in concrete

m = modular ratio

σst = permissible compressive stress in steel

Step two

Determine:

  1. Dimensions of the tank
  2. Volume of the tank
  3. Area of the tank (by assuming its depth)

Refer: How to calculate Water Tank Capacity?

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Reinforced Circular Water Tank | Design of RCC Structures

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RCC Circular Water Tanks

Circular water tanks have the properties of the cylinder. Cylinder stress is exerted on the circular water tank. It is distributed with rotational symmetry. The stress distribution remains unchanged if the object is rotated about a fixed axis.

There are three different patterns of cylinder stress namely;

  1. Hoop stress or circumferential stress – it is in tangential direction
  2. Axial stress – parallel to the axis of the cylinder
  3. Radial stress – It is perpendicular to the symmetry axis but is coplanar

Some important theory for Circular Water Tanks

The base of the circular water tank has a flexible joint. The tank rests on the ground. The wall of the tank is designed for hoop tension.

Formula for Hoop tension (Ht)

The formula for calculating hoop tension is,

Ht = PD/2      ———————————— equation 1

Where,

P = water pressure on wall

D = diameter of tank in metres

The formula for pressure is given by,

P = d x h    —————————————equation 2

Where,

d = density of water =  10kN/m3

h = depth of water in metres

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