This part of IS 3370 provides the code of practice for the structural design and detailing of prestressed concrete structures intended for the storage of liquids, ensuring stability, durability, and leak-tightness.
Provides guidelines for the design and construction of prestressed concrete structures used for the storage of liquids.
Quick Reference Values
Minimum concrete grade for post-tensioned structuresM 30
Minimum concrete grade for pre-tensioned structuresM 40
Max allowable compressive stress in concrete at transfer0.5 fci
Max principal tensile stress in concrete0.24 √fck
Key Formulas
f = (P/A) ± (P·e/Z) ± (M/Z) — Resultant stress in concrete section
Practical Notes
Must be used in conjunction with IS 3370 (Part 1) for general requirements and IS 1343 for general prestressed concrete design.
Special attention is required at wall-to-base junctions (sliding or pinned) to accommodate radial deformations caused by prestressing without causing severe secondary bending moments.
Strict limits on tensile stresses at the liquid-retaining face are crucial to prevent cracking and ensure watertightness.