Design Procedure for Circular Water tank





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?

Step three:

Water tank section

Find:

  1. Hoop tension, Ht = d x h x D/2  

  2. Area of steel, Ast = d x h x D/2 σst

Step four:

Thickness of the wall of water tank

Ht = [1000t + (m – 1)Ast] x σct

Step five

Reduction in hoop steel. The steel calculated in step 3 is for 1m height from the bottom of the water tank. The pressure of water decreases at the top. Hence, steel can be reduced by keeping the same thickness of wall.

Step six

Distribution steel (vertically placed)

Ast = 0.3% of Ag

Step seven

Floor of the tank

Provide 0.3% of Ag both ways

We will also do some good examples for the circular water tank in our succeeding articles.



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  1. #1 by Maawa Hassan on October 8, 2013 - 1:34 am

    Am glad to recieving new posts from your blog, the design provcedures for designing circular tans helped me so much in group project in which we designed an under groung cistern for rain water harvesting.
    could you kindly send me the design procedures for designing a bridge which i want to undertake in my final year project. assuming we have rain fall data, survey information and soil test results.
    i ‘ll be grateful
    Regards
    Maawa

    • #2 by BenzuJK on October 22, 2013 - 7:56 am

      We are glad our site has been helpful. We will try and work on the design procedure for bridges. Keep visiting.

  2. #3 by Albertus Joewono on October 15, 2013 - 1:44 am

    Dear Sirs,

    Thank you for your information about ” How to design Circular Tank”. f ct(permissible tension in concrete), this value is less than 0.5 fr (modulus of rupture). The result amount of Ast is very little. Is there any minimum amount of Ast for hoop reinforcement ??.
    Thank you for your clarification.

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