Torsion Constant (J) – also known as the polar moment of inertia or J, is a value that describes a material's resistance to twisting or torsional deformation.

For instance, Szt is the section modulus about the Z axis to the top fibre of the section. They are usually calculated to the top and bottom fibres section. Zz, Zy in Britain or Australia) – Also known as statical section modulus, and are used in bending stress calculations.

Elastic Section Modulus (Sz, Sy in America.

The calculator will provide this value, but click here to learn more about calculating the first moment of area.

These are typically used in shear stress calculations, so the larger this value the stronger the section is against shearing. Like the Moment of Inertia, these are in both the Z and Y direction. Statical Moment of Inertia (Qz, Qy) – Also known as First Moment of Area, this measures the distribution of a beam section’s area from an axis.The above calculator also acts as a centroid calculator, calculating the X and Y centroid of any type of shape. Learn how to calculate the centroid of a beam section. For non-symmetrical shapes (such as angle, Channel) these will be in different locations. For symmetrical shapes, this will be geometric center. Centroid (Cz, Cy) – this is the center of mass for the section and usually has a Z and Y component.See Moment of Ineria of a circle to learn more. Also worth noting that if a shape has the same dimensions in both directions (square, circular etc.) these values will be the same in both directions.

This is because sections aren’t designed to take as much force about this axis Minor Axis (Iy) – This is about the Y axis and is considered the minor or weak axis.Major Axis (Iz) – This is about the Z axis and is typically considered the major axis since it is usually the strongest direction of the member.The higher this number, the stronger the section. Moment of Inertia (Iz, Iy) – also known as second moment of area, is a calculation used to determine the strength of a member and it’s resistance against deflection.Area of Section (A) – Section area is a fairly simple calculation, but directly used in axial stress calculations (the more cross section area, the more axial strength).Here is a concise list of the section property terms and definitions: The moment of inertia calculator will accurately calculate a number of important section properties used in structural engineering.

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