Thin-Walled Section

The following method is used to calculate characteristic properties of thin-walled section geometry:

the cross-section is assumed to be reduced to the central section line consisting of points with ascribed mass m(s)=r(s) d(s)=1*d(s),

where d(s) refers to the thickness of the section wall, while s is a partial coordinate on the central line.

A thin-walled section is treated as a one-dimensional figure, and is divided into an arbitrary yet finite number of segments and/or arcs.

The following values are presented in the graphical or numerical form for a thin-walled section:

• Area (Ax).
• Center of gravity - position (Yc, Zc) in the global coordinate system.
• Main angle (Alpha) - the angle of inclination of the first main axis in relation to the positive direction of the axis Y of the principal coordinate system.
• Moments of inertia and deviation in relation to the user-defined global coordinate system axes (Iy, Iz, Iyz) as well as to the main, central axes (Iy, Ix).
• Moment of inertia for torsion.
• Location of the shear center (Yr, Zr) in the global coordinate system.
• Weight per bar length unit (WU).