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Frequently Asked Questions (FAQ)
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AnswerIn the printout report selection, you will find filter options, for example, to display only the maximum amount of evidence in the table. These filters reduce the size considerably. The filter options are also available directly in the module.
AnswerYou can change the profile, generally adapt the model and its loads, or enable stabilization in STEEL EC3.In particular, the settings for latitudinal bedding and shear field in the mask 1.12 Bar parameters or 1.13 Bar set parameters, which are then taken into account in the module-internal eigenvalue solver for determining the branch load, are suitable for this purpose.
In an older model in RFEM 4 or RSTAB 7 I measured a DuenQ cross section or general cross section in STAHL EC3. At that time a cross-sectional class 1 or 2 was determined. I have now opened the model in RFEM 5 and now the cross section is classified only class 3 or 4. Why is that? Was the design more economical at the time?
AnswerThe dimensioning of general cross-sections or DuenQ cross-sections in STEEL EC3 is always elastic, ie after class 3 or 4. Since the interaction conditions are restricted to a few cross-sections, no plastic dimensioning is possible for any cross-sectional shapes. In RFEM 4 and RSTAB 7, however, a cross-section could still be classified as class 1 or 2, although the subsequent design took place elastically.To eliminate this ambiguity and to create consistency, the classification has also been changed to cross-sectional class 3 and 4.
AnswerThe reason for the warning is that rod sets are detected by default according to General Procedure 6.3.4 EN 1993-1-1. However, this method is only for a load in the supporting plane, so no cross bending moment allowed and therefore the warning appears.You can perform a proof of stability according to theory II. Order as a cross-sectional proof,which is possible with the additional modules FE-BGDK or STAHL arching torsion.Alternatively you can neglect the transverse bending in the filter options of the "Details / Stability" or in the dialog "National Annex" the extended procedure according to Dr. med. Enable Naumes, which allows transverse bending.The best option in this case, however, is to select the equivalent bar method for the design of the bar sets in the "Details / Stability".
That's right, both add-on modules count on the 7th. Degree of freedom, warping.
The difference is that in RF- / FE-LTB, only those loads that act directly on the set of members are automatically recognized. Loads from other structural components that have an indirect effect on the design set must be added manually as additional loads. In RF- / FE-LTB, a complete recalculation of the system takes place.
RF- / STEEL Warping Torsion, however, analyzes the internal force diagrams from the calculation of the main program and then calculates the loads back. They will be newly applied and calculated. This eliminates the load input, which saves time.
The length L T represents the buckling length for torsional buckling and lateral-torsional buckling under the axial concentricity pressure. The length L T is similar to the columns D and G: A torsional buckling and lateral-torsional ultimate buckling load is calculated for the design of a compressive force according to EN 1993-1-1, clause 184.108.40.206.
The length L W, however, is not a buckling length but the length to which the moment and shear force distribution is related with the boundary conditions k z and k w (columns J and K) as well as the lateral intermediate supports. This length should i. d. R are not changed.
No, they are not. In the add-on module RSBUCK, no stability analyzes for lateral-torsional buckling are performed.
AnswerFor example, the checkbox activates the use of the simplex method also for I-profiles,which otherwise automatically with the partial section size method incl. Rearrangement be measured. If the checkbox is deactivated, the Simplex Method or the partial section size method, depending on the choice, is only used if a general cross section (for example from DuenQ) is to be dimensioned.
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