Section Maker Symbol Definitions

fy Yield stress

fu Ultimate tensile stress

rx Radius of gyration about the X axis

ry Radius of gyration about the Y axis

rz Radius of gyration about the principal axis (for when the principal axis is neither the x or y

axis such as for an angle section.)

Sx Elastic section modulus about the X axis

Sy Elastic section modulus about the Y axis

I1 Moment of Inertia about the Major principal axis at the centroid (Strongest axis)

I2 Moment of Inertia about the Minor principal axis at the centroid

Angle that the Major principal Axis makes with the x axis.

The following values depend on the position of the centroid of the current section:

xc The distance along the x axis of the current section centroid

yc The distance along the y axis of the current section centroid

(If you select all shapes and choose Align to Centroid from the Shape menu

then these will both be 0.0.)

Ixc Moment of Inertia about the X axis through the centroid

Iyc Moment of Inertia about the Y axis through the centroid

(If you select all shapes and choose Align to Centroid from the Shape menu

then they will be equivalent to Ix and Iy )

Ixyc Product of Inertia about the centroid

These values define the extents of the section

xl X (left ) the left most extent of the section on the x axis.

xr X (right ) the right most extent of the section on the x axis.

yt Y (top ) the top most extent of the section on the y axis.

yb X (bottom ) the bottom most extent of the section on the y axis.

Note: B =xr - xl and D= yt - yb

Sxt Elastic section modulus about the X axis at yt

Sxb Elastic section modulus about the X axis at yb

Syl Elastic section modulus about the Y axis at xl

Syr Elastic section modulus about the Y axis at xr

Iw Warping Constant (not used, included for future expansion)