Design Home Standard Beams Steel W Type I-Beam Steel S Type I-Beam Steel Channels Steel Angles Aluminum I-Beams Aluminum Channels Common Beams Square I-Beam Tapered I-Beam Uneven I-Beam General Shape Square Channel Tapered Channel Square L Beam Rectangular L Beam Square T Beam Semi-tapered T Beam Tapered T Beam Rectangular Cross Applications Beam Bending Bibliography
 Home Membership Magazines Forum Search Member Calculators
 Materials Design Processes Units Formulas Math

The Radius of Gyration kx of an Area (A) about an axis (x) is defined as:
equ. (1)
kx equ. (2)
Where Ix is the Moment of Inertia about the axis (x), and A is the area. If no axis is specified the centroidal axis is assumed.
Using the Perpendicular Axis Theorem and equ. (1) from above it can be shown that:
equ. (3)

The Radius of Gyration kxx of a Mass (m) about an axis (x) is defined as:
equ. (4)
k equ. (5)
Where I is the Moment of Inertia about the axis (x), and m is the mass.
If no axis is specified the centroidal axis is assumed.
Radius of Gyration Definition and Concept