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Frequently Asked Questions (FAQ)
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In this case, the only solution is to increase the limit value for special cases for bending in Details, for example, from 0.01 to 0.05 (see the figure). In this way, the correspondingly small moments are not considered.
AnswerUnfortunately, this is not possible. The design module can only be used together with the internal forces from RFEM or RSTAB.
AnswerIn this case, it is recommended to use the module extension RF‑/STEEL Warping Torsion:RF-/STEEL Warping Torsion is an extension of the RF-/STEEL EC3 and RF-/STEEL AISC add-on modules. It performs flexural-torsional (flexural-torsional) buckling analysis of members according to the second-order theory with seven degrees of freedom and application of imperfection with regard to mode shape.You can find more information under the links below this FAQ.
AnswerTo add different supports to a structural component, this must consist of several members and the design must be carried out by using a set of members. It is then possible to assign different parameters to the individual members. The video shows the procedure.
AnswerIf you need to define different types of lateral intermediate supports, it is necessary to divide the specific member. After that, you can create a set of member and with that done, you can easily define different types of intermediate supports along this set of member, or you can use different nodal supports in the nodes of the set of member.
AnswerFor a stability analysis of any cross-section, the add-on modules RF‑/STEEL EC3 Warping Torsion (extension for RF‑/STEEL EC3) and RF‑/FE‑LTB (stand-alone module) are particularly suitable.By using the calculated critical buckling value, you can determine critical loads and perform the design according to the second-order analysis.
AnswerIn the printout report selection, you can find filter options, for example, to display only the maximum design by member in the table. These filters considerably reduce the extent. The filter options are also available directly in the module.
AnswerThe DUENQ cross-section consists of several non-contiguous partial cross-sections, so that in DUENQ it is calculated according to the theory of stiffening systems. DUENQ also gives a hint before the calculation. The dimensioning of such cross sections is not possible in add-on modules such as RF / STEEL EC3, RF / ALUMINUM etc.In most cases, however, the cross-sectional parts should be connected to each other. The FAQ describes how this connection can be modeled.
AnswerAll effective length factors are preset to 1.0 by default. There is no calculation of the factors based on the model.The effective length factors must be adjusted manually for the design or can be imported from the add‑on modules RSBUCK or RF‑STABILITY.
I have modified cross-section properties or reduced stiffnesses of a members in RFEM/RSTAB. After a new calculation, the deformation of the structural system has adjusted itself to the new cross-section properties. However, this change is not taken into account when performing design in add-on modules.
In principle, the modified cross-section properties are not transferred into add-on modules, such as RF‑/STEEL or RF‑/STEEL EC3. They are only used for the calculation of internal forces.
In the add-on modules, stresses are calculated using the real cross-section dimensions, which cannot be modified. This would be difficult to implement as many designs require the element width or height and due to the modification, it is not known which parameter has been reduced exactly. This is important for the c/t-designs in RF‑/STEEL EC3, for example.
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Wind Simulation & Wind Load Generation
With the stand -alone program RWIND Simulation, you can simulate wind flows around simple or complex structures by means of a digital wind tunnel.
The generated wind loads acting on these objects can be imported to RFEM or RSTAB.
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