Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
A strap beam is a stiff concrete beam linking an edge footing on the boundary to an inner footing. The edge footing cannot extend past the plot line, so its load is eccentric, and the strap carries the moment and balances it.
Why it matters on a project
Without it, the edge footing tilts and columns and walls can crack. It is a common solution for villas and buildings next to a neighbour.
Measurement and pricing
Concrete in cubic metres, steel in tonnes from the bar bending schedule, and formwork in square metres.
Common mistake
Treating the strap as an ordinary tie beam and reducing its section and steel, though it carries a large moment.
Frequently asked questions
When do I need a strap beam?
When a column footing sits on the plot boundary and cannot extend past it.
Is a strap beam a tie beam?
Both sit at foundation level, but the strap carries a large moment and is designed for it.
Related terms
- Footings (foundations)Structural elements that transfer the building loads to the soil.
- Ground beam (tie beam)A ground-level beam tying the footings and carrying walls at ground level.
- Column neck (stub column)The part of a column between the footing and ground beam level.
- Bar bending schedule (BBS)A schedule listing the diameter, length, shape and number of reinforcement bars per element.
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