Design Procedure Of Circular Tank Step By Step

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Design Procedure Of Circular Tank Step by Step



Step1:  Thickness Of Wall
The Thickness Of wall may be selected from the following considerations:
1.Thickness of wall may be at least 150mm
2. Thickness of wall may be about 30mm per meter depth + 50

Step2: Pressure Intensity
      
Consider the bottom of 1m height of the wall. Pressure intensity corresponding to the centre of the bottom 1 metre height of wall.
                             
                                        p= w×h
            Where w= Specific weight of water
             And    h= Height of water

Step3: Hoop Tension
            
                       T= pD/2
           Where T=Hoop Tension
                      p  = Pressure intensity
                        D=Diameter of Tank


Step4: Steel Required For 1m Height
    = Hoop tension/Permissible Tensile stress




Step5: Minimum Steel Required      
              = 0.3% of gross area




Step6: Spacing  
         
             = (79×1000) ÷Minimum steel Required


Step7: Actual Area Of Steel Provided
       

Step8: Check For Tensile stress in Concerte
    Tensile stress in concrete= T÷[A+(m-1) Ast]
                 Where T= Hoop Tension
                            A= gross Area
                         m= Modular ratio=13.33
                       Ast= Area of steel


Step9: Vertical Distribution Steel
           
  This shall be at least 0.3% of gross area

Step10: Base Slab

         This will be a 150mm to 200mm thick slab with a top mesh and a bottom mesh of steel with 10mm diameter bars at 250mm c/c distance.
             


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