Engineering
Advanced

Second Moment of Area (Rect.)

Resistance of a rectangular section to bending.

Formula

I=bh312I = \frac{bh^3}{12}

Variables

bWidth
hHeight

Example

A beam 0.1 m wide, 0.2 m deep: I = 0.1·0.2³/12 ≈ 6.7×10⁻⁵ m⁴.

Did You Know?

An I-beam puts material far from the center because bending resistance grows with the cube of depth.

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