This code provides criteria for the earthquake-resistant design and analysis of bridges, viaducts, flyovers, and aqueducts, including the determination of seismic base shear, hydrodynamic forces on submerged piers, and ductile detailing requirements.
Establishes criteria for earthquake resistant design of bridges, covering seismic forces, analysis methods, and detailing requirements.
Quick Reference Values
Zone factor (Z) for Zone V0.36
Zone factor (Z) for Zone IV0.24
Zone factor (Z) for Zone III0.16
Zone factor (Z) for Zone II0.10
Importance factor (I) for critical bridges1.5
Importance factor (I) for normal bridges1.0
Key Formulas
Ah = (Z/2) * (I/R) * (Sa/g) — Design horizontal seismic coefficient
Vb = Ah * W — Design seismic base shear
Practical Notes
Response Reduction Factors (R) for bridges differ significantly from those used for buildings; ensure Part 6 specific values are applied.
Hydrodynamic forces must be added to inertial seismic forces for bridge piers partially or fully submerged in water.
Consider vertical seismic forces for bridges with long spans, those located in Zones IV and V, or bridges resting on prestressed concrete components.