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Useful Program Features
The Knowledge Base includes technical articles on a wide array of structural analysis and design topics.
These articles are intended to help you navigate through the Dlubal programs, learn efficient tips and tricks, and provide further insight into the program features.
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The RF‑STABILITY and RSBUCK add‑on modules for RFEM and RSTAB allows you to perform eigenvalue analysis for frame structures in order to determine critical load factors including the buckling modes. It is possible to determine several buckling modes. They provide information about the model areas bearing stability risks.
The RF-/STEEL EC3 add‑on module performs a detailed cross‑section classification at each design before the design is carried out. Thus, the susceptibility to local buckling of all cross‑section parts is evaluated. The defined cross-section class has an effect on the resistance and rotational capacity determination.
When modeling a structure, irregular numbering of objects may occur due to copying, dividing lines and members, and so on. Automatic renumbering allows you to restructure the numbering and thus to improve the clear arrangement. This function is applicable to nodes and members as well as for lines, surfaces and solids in RFEM.
For structural reasons, shear connections usually include fin plates or flange angles. Main and secondary beams arranged on the top edge require notching or long fin plates. Hinged end plate connections are often welded to the web.
The previous post on this topic describes instabilities that may occur when using tension members. The example shown refers primarily to wall stiffening. Now, instability error messages can also refer to nodes within the range of supports. Especially truss girders and support trusses are susceptible to this. So what causes the instability here?
Shoring braces usually obtain the ‘tension member’ type. There are a few specifics to note because in the case of uniform, symmetrical structures and solely vertical loads, an error message often appears as follows: ‘The model is unstable in Node 20 relocatable in the Y‑direction’.
A previous post describes the stability analysis of double angles. It dealt with the analysis performed on a single member.
Diagonals of double angles are used for pipe bridge construction or for truss girders, among other things. They are usually subjected to tension, but it is necessary to transfer them in smaller compression forces with regard to the load application. Especially in the case of slender diagonals, you should consider also the bending due to self‑weight.
If you look at the cross‑section properties of the metal category, you can see that there are three types of shear area, whose meaning and calculation are described here.
In the case of horizontal beam‑like supporting structures, the favourable and unfavourable load components of the permanent actions should be considered separately. In RFEM and RSTAB, this is possible as follows.
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