IS 7192:1974 is the Indian Standard (BIS) for design and construction of concrete railway bridges. This standard outlines the code of practice for the design and construction of reinforced and prestressed concrete bridges intended for railway loading. It primarily follows the Working Stress Method, specifying permissible stresses, load considerations like impact and longitudinal forces, and detailing requirements for both superstructure and substructure components.
Provides guidelines for the design and construction of plain and reinforced 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 |
|---|---|---|---|
| Primary Design Philosophy | Working Stress Method (WSM) | Limit State Design (LSD) / Load and Resistance Factor Design (LRFD) | EN 1992-2 / AREMA Ch. 8 |
| Partial Safety Factor for Concrete (ULS Material) | Not directly used; a global Factor of Safety (~2.5-3.0) on strength is implicit in allowable stresses. | γc = 1.5 | EN 1992-2:2005 |
| Partial Safety Factor for Steel (ULS Material) | Not directly used; a global Factor of Safety (~1.8) on yield is implicit in allowable stresses. | γs = 1.15 | EN 1992-2:2005 |
| Standard Railway Live Load Model | Broad Gauge (BG) Loading - 1926 or Revised Broad Gauge (RBG) - 1975 | Cooper E-80 or specific agency-defined loading | AREMA MRE, Chapter 8 |
| Minimum Concrete Cover (Moderate Exposure, RC) | 25 mm for Cast-in-situ concrete members | ~35 mm (nominal cover, depending on concrete grade and specific exposure sub-class) | EN 1992-2:2005 |
| Consideration of Creep and Shrinkage | Acknowledged, but calculations are based on simplified methods and coefficients (e.g., modular ratio). | Detailed models for predicting time-dependent effects based on concrete composition, member size, and environmental humidity. | EN 1992-2:2005 |
| Maximum Design Crack Width (RC, Serviceability) | Not explicitly calculated; controlled by limiting steel and concrete stresses under service loads. | 0.3 mm (for moderate exposure, under quasi-permanent loads) | EN 1992-1-1:2004 |