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.
Quick Reference Values
Density of water (w) standard design assumption10 kN/m3
Max table aspect ratio (L/B or c/b) for rectangular tanks3.0
Max shape factor (H^2/Dt) for cylindrical tank tables16.0
Key Formulas
M = Coefficient * w * a^3 — Bending moment in rectangular tank walls
T = Coefficient * w * H * R — Hoop tension in cylindrical tank walls
V = Coefficient * w * H^2 — Shear force at the base of cylindrical tanks
Practical Notes
Carefully verify the boundary condition (fixed vs. hinged base) before selecting the appropriate table.
Coefficients are given for specific dimensional ratios; linear interpolation is typically required for intermediate values.
Ensure appropriate sign conventions are followed for moments (positive vs. negative) to correctly place tension reinforcement on the liquid face or outer face.