While RISA-3D does not have an explicit tool to punch a hole in a plate, you can use the following steps to manually model them

Have you ever received an instability warning when running a three dimensional RISA-3D model? This is because RISA-3D cannot build the stiffness matrix with the configuration you have modeled.

RISA-3D will optimize your member size based on the analysis results. This means it will up or down-size your member to get closer to the unity/code check you’ve specified in your Design Rules.

In RISAFloor on the roof level, you layout only the top chords of the truss and create your slope.

In RISAFloor, the beams are susceptible to two forms of buckling; Euler buckling and lateral-torsional buckling. The unbraced length is determined in RISAFloor using the deck properties and framing.