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Question:

what types of stress require steel to be placed in footings?

In construction, what types of stress require steel to be placed in footings?

Answer:

Shear and bending stress.
Bending moment , shear stress and punching stresses
Steel is always added to concrete to handle local 'tension' stresses. (Sometimes to provide extra compression in 'pre-stressed' applications, but the steel is still in tension.) Steel would be added to the lower section of footings to stiffen them to 'bridge' local 'soft spots' in the substrate.

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