Statics › Section J · Moments of inertia › Topic J.4
Moments of inertia of composite shapes
Beams, columns and brackets have cross-sections built from rectangles, triangles and circles. Break the section into those parts, shift each part's moment of inertia to a common axis, and add: a tidy table keeps the whole job under control.
In this topic
- Building sections from parts
- The composite area method
- Setting out the table
- Worked example: a T-section
- Checking by a second route
- Worked example: a plate with a hole
- Worked example: an I-section
- Standard steel sections
- Common mistakes to avoid
- Key takeaways
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