What are the standard bay spacings recommended by IS 8640?

The code recommends bay spacings of 6 m, 8 m, 10 m, and 12 m. (Clause 4.2, Table 2)

Are the dimensions in this code mandatory for industrial building design?

No, they are recommendations intended to achieve standardization and economy. Deviations are permitted based on project-specific needs. (Clause 1.2)

What are the recommended truss or portal frame spans?

For spans up to 30 m, the code recommends spans in multiples of 3 m, e.g., 12 m, 15 m, 18 m, 21 m, 24 m, 27 m, and 30 m. (Clause 4.1, Table 1)

How is the height of the building determined according to this code?

The code recommends clear heights in increments of 0.6 m. The final height is determined by functional requirements, particularly crane operation. (Clause 4.3)

IS 8640

: 1977

Recommendations for dimensional parameters for industrial building

CurrentSpecializedGuidelinesBIMStructural Engineering · Structural Engineering and Structural Sections

Download PDF BIS Portal Google

This standard provides recommendations for the dimensional parameters of single-storey industrial buildings to promote modular coordination and economy. It suggests preferred spans, bay spacings, and heights for structural frames, facilitating the use of standard components and simplifying design and construction.

Recommendations for dimensional parameters for industrial building

Quick Reference Values

Recommended Spans12 m, 15 m, 18 m, 21 m, 24 m, 27 m and 30 m

Recommended Bay Spacing6 m, 8 m, 10 m and 12 m

Basic Planning Module (M)100 mm

Horizontal Multimodule3 M (300 mm)

Vertical Multimodule2 M (200 mm) up to 6m height, 6 M (600 mm) above 6m height

Recommended Clear Height Increment0.6 m

Practical Notes

These dimensions are recommendations, not mandatory rules. Deviations are permissible to meet specific functional, operational, or economic requirements.

Adhering to these standard dimensions can significantly simplify the design and procurement of Pre-Engineered Buildings (PEB).

The building height is often governed by crane operational requirements (hook height, gantry dimensions). Always coordinate with crane data (as per IS 807) early in the design process.