How is hoop tension calculated for circular tanks using this code?

By finding the coefficient 'C' from the tables based on the H^2/Dt ratio, and applying it to the formula T = C * w * H * R.

Which dimensionless parameter is used to enter the circular tank tables?

The parameter H^2/Dt, where H is height, D is diameter, and t is wall thickness.

Does this part cover rectangular tanks?

Yes, Section 3 provides extensive moment coefficient tables for rectangular wall panels based on span ratios (a/b) and various edge support conditions.

IS 3370 Part 4

: 1967

Concrete Structures for Storage of Liquids - Code of Practice - Design Tables

CurrentSpecializedCode of PracticeBIMStructural Engineering · Swimming Pools and Sports Facilities

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IS 3370 Part 4 provides comprehensive design tables for calculating bending moments, shear forces, and hoop tensions in concrete liquid retaining structures. It includes coefficients for both circular and rectangular tanks subjected to hydrostatic loading under varying support conditions.

Provides design tables for use in conjunction with other parts of IS 3370 for concrete structures for liquid storage.

Quick Reference Values

shape parameter circularH^2 / Dt (Height squared over Diameter x thickness)

shape parameter rectangulara/b (Ratio of span dimensions)

hydrostatic load distributionTriangular (wH at base, 0 at top)

Key Formulas

T = C * w * H * R (Hoop tension formula using table coefficients)

M = C * w * H^3 (Bending moment formula for vertical walls)

V = C * w * H^2 (Shear force at base)

Practical Notes

Ensure the correct base boundary condition (fixed vs. hinged) is established before selecting the circular tank table.

For rectangular tanks, verify that the aspect ratio and edge support conditions (free, hinged, fixed) exactly match the physical design.

Interpolation is often required for H^2/Dt values or aspect ratios not explicitly listed in the tables.