The structural analysis software RFEM 6 is the basis of a modular software system. The main program RFEM 6 is used to define structures, materials, and loads of planar and spatial structural systems consisting of plates, walls, shells, and members. The program also allows you to create combined structures as well as to model solid and contact elements.
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Where the geometries become complicated, it is difficult to use analytical methods for the design. The weld elements in RFEM 6 are particularly helpful for such applications.
RFEM 6 allows for design checks for different types of welds.
In the Joint type list, you can select how the surfaces to be connected are related to each other.
Then, select a weld type.
Finally, it is necessary to define the weld parameters.
The welds do not affect the stiffness of the model. You use the stresses from the surface elements and evaluate them according to the regulations.
The default Design Situations (DS1 and DS2) do not include the seismic load combinations. To add the seismic COs, add new Design Situations with design situation type “Section 2.3 (LRFD), 6 and 7” and/or “Section 2.4 (ASD), 8 to 10” (Image 1).
Under the Load Combinations tab, the generated seismic COs are shown.
1) The default orthogonal combination factor is set to 0.3 (30%). This value can be changed by going to Edit Parameters of Edition in the Load Cases & Combinations (Image 1)
2) Under the Load Cases tab, create the seismic load cases in the X and Y directions with Qe as the Action Category. Specify the direction under the Additional Settings tab (Image 2)
3) Under the Design Situations tab, select the Edit Combination Wizard button. In the Standard Options tab, make sure that the Include orthogonal combinations option is activated (Image 3)
4) The generated COs including the orthogonal combination factor are listed in the Load Combinations tab (Image 4)
When designing general cross-sections in the RF‑STEEL AISC add-on module, a "Non-designable" message is given for the design ratio. General cross-sections are defined in the program as user-defined sections or shapes which are not included in the specification. Though, some user-defined cross-sections can be designed under specific conditions. The warning message is displayed because shear buckling is not provided for general cross-section in the AISC 360‑16 [1] Chapter G. More info on this topic can be found in the RF‑STEEL AISC manual linked below.