IS 1893:2014 Part 4 is the Indian Standard (BIS) for criteria for earthquake resistant design of structures - industrial structures including stack like structures. This part of the IS 1893 series focuses on the earthquake-resistant design of industrial structures and stack-like structures (chimneys, silos, cooling towers). It provides specific importance factors, response reduction factors, and guidance on dynamic analysis for structures with irregular mass and stiffness distribution.
Provides criteria for the earthquake resistant design of various types of industrial structures and stack-like structures.
Overview
- Status
- Current
- Usage level
- Specialized
- Domain
- Structural Engineering — Disaster Resilience and Retrofitting
- Type
- Code of Practice
Also on InfraLens for IS 1893
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Industrial structures often have highly asymmetrical mass and stiffness distributions; a detailed 3D dynamic analysis is strongly recommended.
! Ensure the operating weight of equipment, fluids, and stored materials is appropriately considered in the seismic weight calculations.
! For tall stacks and chimneys, P-delta effects and soil-structure interaction often play a critical role and should not be ignored.
Frequently referenced clauses
reinforced concretesteelmasonry
International Equivalents
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International Comparison — Coming Soon
We're adding equivalent international standards for this code.
Key Values7
Quick Reference Values
Importance factor (I) for structures storing hazardous materials1.5
Importance factor (I) for power plant structures1.5
Importance factor (I) for regular industrial structures1.0
Response reduction factor (R) for RCC chimneys3.0
Response reduction factor (R) for Special Steel Moment Resisting Frame5.0
Damping for steel stacks2%
Damping for concrete stacks5%
Key Formulas
Ah = (Z/2) * (I/R) * (Sa/g) — Design horizontal seismic coefficient
Vb = Ah * W — Design seismic base shear
Tables & Referenced Sections
Key Tables
Table 1 - Importance Factor, I
Table 2 - Response Reduction Factor, R, for Industrial Structures
Key Clauses
Clause 6 - Design Criteria
Clause 7 - Mathematical Modeling
Clause 8 - Stack-Like Structures
Clause 9 - Industrial Structures
Frequently Asked Questions4
What is the importance factor for a structure storing highly hazardous materials?+
1.5 (Table 1)
What is the response reduction factor (R) for an ordinary steel moment-resisting frame in an industrial plant?+
4.0 (Table 2)
Do we need to consider soil-structure interaction for stack-like structures?+
Yes, especially if the structure rests on soft soil, as base flexibility significantly alters the fundamental time period.
How is the seismic weight computed for silos?+
It includes the dead load of the silo plus the appropriate percentage of the stored material's weight, accounting for friction and pressure.
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.