IS 10045:1981 is the Indian Standard (BIS) for design and construction of prestressed concrete railway bridges. This code of practice provides guidelines for the design and construction of prestressed concrete superstructures for railway bridges. It covers materials, loads and forces, permissible stresses, design considerations for flexure, shear, and torsion, and detailing of prestressing systems specific to railway environments.
Provides guidelines for the design and construction of prestressed concrete railway bridges.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Design Philosophy | Working Stress Method (WSM) | Limit State Design (LSD) / Load and Resistance Factor Design (LRFD) | EN 1992-2 / AREMA Ch. 8 |
| Minimum Concrete Grade (Prestressed) | M40 (40 N/mm² cube strength) | C30/37 (30 N/mm² cylinder / 37 N/mm² cube strength) | EN 1992-1-1 |
| Permissible Compressive Stress in Concrete (Service) | 0.33 * f_ck (characteristic cube strength) | 0.60 * f_ck (characteristic cylinder strength) | EN 1992-1-1 (Quasi-permanent SLSC) |
| Permissible Compressive Stress in Concrete (at Transfer) | 0.51 * f_ci (cube strength at transfer) | 0.60 * f_ck(t) (cylinder strength at transfer) | EN 1992-1-1 |
| Permissible Tensile Stress (for crack control) | Limited to specific values (e.g., 1.0 N/mm²) or zero depending on conditions. | Not a primary limit; crack width is calculated and limited directly (e.g., w_k ≤ 0.2 mm). | EN 1992-2 |
| Nominal Concrete Cover (Post-Tensioned, Moderate Environment) | 40 mm | ~40-50 mm (Varies with exposure class, e.g., XC4 for 100-year life) | EN 1992-1-1 |
| Partial Safety Factor on Concrete (Ultimate Limit State) | Not applicable (WSM uses a global Factor of Safety on stress) | 1.5 | EN 1992-1-1 |
| Partial Safety Factor on Prestressing Steel (Ultimate Limit State) | Not applicable (WSM) | 1.15 | EN 1992-1-1 |