Rectangular section: I, Z and bending stress

Set the breadth, depth and bending moment to see I, Z and the maximum bending stress.

Works in metric or imperial units.

Learn second moment of area properly

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Questions students ask

Why are beams deeper than they are wide?

Stiffness grows with depth cubed, so depth gives far more strength and stiffness for the same material.

What formula does it use?

I = bh³/12; Z = bh²/6; σ = M/Z.

Free notes on second moment of area

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