Use the Cross-Section Data node to describe the section for the truss elements on the selected edges.

The default is User defined. Select Common sections to choose from predefined sections.

For User defined go to Basic Section Properties to continue defining the cross section.

For Common sections select a Section type — Rectangle, Box, Circular, Pipe, H-profile, U-profile, T-profile, C-profile, or Hat. Then go to the relevant section below to continue defining the section. Each Section type also has a figure showing the section and its defining dimensions.

Enter a value or expression for the Diameter do.

Enter the cross-section Area A.

Enter the Smallest principal moment of inertia, Imin. This is the area moment of inertia in the weakest direction of the cross section. This input is only required for a user-defined cross section. For one of the predefined cross sections, the moment of inertia is computed from the geometrical properties.

Enter the Effective length factor, K. This is a multiplier to the physical length of the bars, intended for compensating for end conditions. The default value, 1, corresponds to a pure Euler 2 buckling case.

Physics tab with Truss selected: