RFEM and RSTAB provide a wide range of selection options. Some of the previous posts have already described selection using "Special Selection" or tables.
Nodal supports are usually defined with regard to the global axis system. However, it is sometimes necessary to rotate the nodal support. For example, for a floor slab with a pile foundation. For geological reasons, the piles do not rest in the ground vertically, but in an inclined position. Each end point of the piles has a nodal support that can only absorb forces along the pile foundation direction. Therefore, rotating the nodal support is required. Various options for this are described in previous posts.
The RFEM or RSTAB user interface can be customized. The previous posts describe how to create toolbars and menu bars. Thus, this post focuses on the load case drop‑down list. This drop‑down list allows you to switch between individual load cases, combinations, and module cases.
In the following example, the stability analysis of a steel frame can be performed according to the General Method in compliance with EN 1993‑1‑1, Sect. 6.3.4 in the RF‑/STEEL EC3 add-on module. The first of my three posts shows the determination of the critical load factor for design loads required by the design concept, which reaches the elastic critical buckling load with deformations from the main framework plane.