IS 3370:2009 Part 4 is the Indian Standard (BIS) for concrete structures for storage of liquids - design tables. This part of IS 3370 provides comprehensive design tables containing coefficients for calculating bending moments, shear forces, and hoop tensions in the walls of cylindrical and rectangular liquid storage structures. It accounts for various boundary conditions such as fixed, hinged, or free edges under triangular hydrostatic pressure.
Contains design tables and curves to aid in the design of concrete structures for liquid storage.
Coefficient tables for moments, shears and ring tensions in cylindrical and rectangular liquid-retaining structures. Use with Parts 1–3 for stress checks.
| Reference | Value | Clause |
|---|---|---|
| Application | Design tables / coefficients for moments, shears and ring tensions | Cl. 1 / Foreword |
| Cylindrical tanks — hinged/free base | Coefficients tabulated for H²/Dt ratios | Annex A (Tables) |
| Cylindrical tanks — fixed base | Coefficients tabulated similarly | Annex A (Tables) |
| H²/Dt — common range | 0.4 – 16 (Tables provided) | Annex A |
| Rectangular tanks — coefficients | For ratio L/B and B/H per panel boundary conditions | Annex B |
| Triangular load — wall fixed at base, free at top | Coefficients for hoop/vertical moments | Annex B |
| Uniform load — wall fixed at base, hinged at top | Coefficients tabulated | Annex B |
| Ring tension — coefficient symbol | T = coefficient × γ·H·D/2 | Annex A (notation) |
| Vertical bending moment — coefficient | Mv = coefficient × γ·H³ (cylindrical) | Annex A (notation) |
| Plate-bending — Poisson's ratio assumed | 0.20 (concrete) | Annex A (Note) & Annex B (Note) |
| Bottom slab on ground — uplift case | Treat as plate on elastic foundation; tables in Annex C | Annex C |
| Roof slab — flat dome assumptions | Coefficients per ratio rise/span | Annex D |
| Continuity at base — partial fixity factor | Designer judgment / soil-structure interaction | Cl. 5 |
| Design temperature gradient — guidance | 10 – 25 °C through wall (typical) | |
| Safety factors — applied via Part 1/2 stresses | Tables give moments only; combine with Part 1/2 | Cl. 1 |