This code specifies the criteria and general principles for the earthquake-resistant design of structures, with a specific focus on buildings. It details the calculation of seismic base shear, categorization of seismic zones in India, and establishes requirements for static and dynamic analysis to ensure structural safety.
Provides criteria for earthquake resistant design of buildings and structures, including general principles, design loads, and detailing requirements (older version).
Quick Reference Values
maximum storey drift0.004 times the storey height
zone factor zone V0.36
importance factor hospitals schools1.5
response reduction factor SMRF5.0
response reduction factor OMRF3.0
Key Formulas
Ah = (Z/2) * (I/R) * (Sa/g) — Design horizontal seismic coefficient
Vb = Ah * W — Design seismic base shear
Ta = 0.075 * h^0.75 — Approximate fundamental natural period for RC frame building without brick infill
Practical Notes
If the base shear calculated by dynamic analysis is less than the base shear calculated by the equivalent static method, the dynamic analysis base shear and associated forces must be scaled up.
Storey drift must be evaluated using a partial safety factor of 1.0 for all load cases.
The stiffness of masonry infill walls should be properly accounted for in the structural model unless they are explicitly separated from the frame.