Hello,

I have a doubt regarding design of underground tanks.While designing a  circular tank for water pressure we take coefficients for hoop tension and design it. Can we apply same method for the external soil pressure acting on the walls in case of underground circular tanks. Can we consider same co-efficient and permissible tensile stress to calculate the steel required. As the pressure acting from outside acts as hoop compression what is the exact procedure to calculate the area of steel required.

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