IS 1893:2016 — Clause Reference

Seismic Zone Map and Zone Factor Z

Clause 6.4.2 divides India into four seismic zones (II, III, IV, V) based on the expected intensity of earthquake ground…

Importance Factor I

Clause 7.2.2 assigns an importance factor I to buildings based on their functional use and post-earthquake significance.…

Response Reduction Factor R

Clause 7.2.6 specifies the response reduction factor R, which accounts for the overstrength, redundancy, and ductile ene…

Design Response Spectrum Sa/g

Clause 6.4.5 provides the design acceleration response spectrum Sa/g as a function of the natural period T of the struct…

Design Seismic Base Shear VB

Clause 7.2.1 defines the total design lateral force (base shear) VB as the product of the design horizontal seismic coef…

Approximate Fundamental Natural Period Ta

Clause 7.6.2 provides empirical formulas to estimate the fundamental natural period Ta of a building for the equivalent …

Distribution of Design Force Along Height

Clause 7.6.3 specifies how the total design base shear VB is distributed as lateral forces at each floor level. The dist…

Regular and Irregular Buildings

Clause 7.1 classifies buildings as regular or irregular based on their geometric configuration and stiffness/mass distri…

Design Horizontal Seismic Coefficient Ah

Clause 7.2 defines the design horizontal seismic coefficient Ah, which is the key parameter linking seismic zone, soil t…

Seismic Zone Classification of Indian Cities

Table 2 of IS 1893 Part 1:2016 provides the seismic zone classification for important towns and cities across India. Thi…