Where should seismic bands be provided in a masonry building?

At plinth level, lintel level, roof level, and gable ends to tie the walls together (Clause 8.3).

What is the minimum thickness of a reinforced concrete seismic band?

75 mm where two longitudinal bars are provided, and 150 mm where four bars are required (Clause 8.3.1).

Can IS 4326 be used for RCC framed structures?

No, IS 4326 is primarily for masonry and timber buildings. RCC framed buildings should follow ductile detailing as per IS 13920.

What is the rule for placing windows/doors near a wall corner?

Openings should be at least 600 mm or 1/4th the height of the opening away from the corner, whichever is more (Clause 5.3.2).

IS 4326

: 1993

Earthquake Resistant Design and Construction of Buildings - Code of Practice

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IS 4326 provides essential guidelines for the earthquake-resistant design and construction of load-bearing masonry and timber buildings. It specifies structural detailing rules such as the provision of seismic bands (plinth, lintel, roof) and vertical reinforcement at corners and junctions to ensure integral 'box-action' and prevent sudden collapse during seismic events.

Provides guidelines for earthquake resistant design and construction of buildings, relevant for seismic retrofitting.

Quick Reference Values

minimum RC band thickness 2 bars75 mm

minimum RC band thickness 4 bars150 mm

minimum distance of opening from corner600 mm or 1/4 of opening height

minimum lap length for vertical steel50 times bar diameter

maximum total length of openings ratio single story0.50 (50% of wall length)

Practical Notes

This code is specifically for load-bearing masonry buildings; for RCC frame structures, IS 13920 must be used.

Ensure proper continuous detailing of lintel and roof bands at corners and T-junctions to maintain structural integrity.

Openings in walls (doors/windows) should be kept small, centrally located, and sufficiently away from corners to avoid weakening the masonry.