IS 1893:2015 Part 4 is the Indian Standard (BIS) for criteria for earthquake resistant design of structures - industrial structures including stack-like structures. This code establishes the criteria for the earthquake-resistant design of industrial structures, encompassing plant buildings, elevated structures, and stack-like structures such as chimneys, silos, and cooling towers. It provides specialized design parameters including importance factors, response reduction factors, and damping ratios tailored to the unique dynamic characteristics and hazard levels of industrial facilities.
Specifies criteria for earthquake resistant design of various industrial structures and stack-like structures.
Importance factor by category, R-values, drift limits and equipment anchorage for industrial / process plant.
| Reference | Value | Clause |
|---|---|---|
| Scope | Industrial structures (incl. stack-like, large RCC silos, frames supporting equipment) | Cl. 1 |
| Importance factor I — minimum (industrial general) | 1.0 | Cl. 6.2.6 (Table 1) |
| Importance factor I — hazardous / Cat 1 | 1.75 | Cl. 6.2.6 (Table 1) |
| Importance factor I — Category 2 (high process) | 1.50 | Cl. 6.2.6 (Table 1) |
| Importance factor I — Category 3 (moderate) | 1.25 | Cl. 6.2.6 (Table 1) |
| Response reduction R — RC frame (SMRF) | 5.0 | Cl. 6.2.7 (Table 2) |
| Response reduction R — Steel SMRF | 5.0 | Cl. 6.2.7 (Table 2) |
| Response reduction R — Steel braced (CBF) | 4.0 | Cl. 6.2.7 (Table 2) |
| Response reduction R — Stack / chimney (cantilever) | 1.5–2.0 | Cl. 6.2.7 (Table 2) |
| Damping — bolted steel structures | 5 % (typical) — but lower for OWSJ / equipment skids | Cl. 7.5 |
| Sloshing / liquid in vessel — refer Part 2 | Use IS 1893 Part 2 (liquid retaining) | Cl. 1.3 / 7 |
| Time period — stack/chimney | Ta = CT · h^(3/4) (use Annex) | Annex C / E |
| Drift limit — industrial frame | 0.004 × storey height (general); 0.0025 for crane frames | Cl. 7.11.1 |
| Ductile detailing | Per IS 13920 (RC) / IS 800 ductile clauses | Cl. 7.2.4 |
| Vertical seismic — required when | Long span, cantilever, prestressed, equipment | Cl. 6.4.5 |
| Equipment anchorage forces | Per Annex F (rigid 0.6 g for Z=0.36) | Annex F |
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.