What is considered 'low-strength masonry'?

Masonry with a prism compressive strength less than 5.0 N/mm^2, typically using weak mortars like mud or lime-sand (Clause 3.3).

What is the maximum number of storeys for a low-strength masonry building in Seismic Zone V?

Only one storey is permitted in Zone V (Clause 7.1.1).

What is the minimum reinforcement for a lintel band?

A minimum of two 8mm diameter steel bars in a 75mm thick concrete band (Clause 5.2.2).

IS 13828

: 1993

Improving Earthquake Resistance of Low Strength Masonry Buildings - Guidelines

CurrentSpecializedGuidelinesStructural Engineering · Masonry and Bricks

Download PDF BIS Portal Google

This standard provides guidelines for improving the earthquake resistance of buildings constructed with low-strength masonry. It outlines key planning considerations and construction features, such as horizontal bands and corner reinforcement, to enhance structural integrity during seismic events. Note: The requested code IS 13829 is not a valid BIS standard; this response is for IS 13828, which matches the subject matter.

Provides guidelines for improving earthquake resistance of existing and new low-strength masonry buildings.

Quick Reference Values

Maximum building height (Seismic Zone V)1 storey

Maximum building height (Seismic Zone IV)2 storeys

Maximum building height (Seismic Zone III)2 storeys

Minimum lintel band thickness75 mm

Minimum lintel band reinforcement2 bars of 8 mm diameter

Maximum wall length between cross walls5 m

Definition of Low-Strength Masonry< 5.0 N/mm² prism strength

Practical Notes

This code is specifically for 'low-strength' masonry (compressive strength < 5.0 N/mm^2) and is crucial for non-engineered or vernacular buildings.

The core principle is to provide a 'box-action' using horizontal bands (lintel, roof, plinth) and corner reinforcement to prevent wall separation and collapse.

Adherence to building planning rules, like maintaining a simple rectangular plan and controlling opening sizes, is as important as the structural elements.