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Frequently Asked Questions (FAQ)
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AnswerYou can either define the nodal support or the intermediate restraint in RF- / STEEL EC3.If you already have nodes in your actual RFEM or RSTAB model, we recommend directly entering the nodal support in the 1.7 dialog box, because you can select the nodes directly in the model. See Figure 01.If you want to consider intermediate storage at a point in a horizontal beam where you do not have a node available in your actual system, you can use the intermediate support and select the intermediate support (for example Preload (lateral / torsional restraint)). See Figure 02.
AnswerThe module works according to DIN 18800 and proof with torsional forces is not possible there. An elastically plastic proof with torsion is possible with the STAHL EC3 module.
AnswerIn order to carry out a fire protection certificate in STEEL EC3, you must select a load case or a load combination in the "Fire protection" tab for which the fire protection certificate is to be carried out.As soon as you have selected a load for the fire protection certificate, an additional mask "Fire protection bars" or "Fire protection - Rod sets" appears in the module navigator on the left (if rod sets are to be dimensioned in the module case). In this screen 1.10 or 1.11 further settings for the fire protection proof of the component can be set.Further detail settings (eg. example required duration of fire protection, etc.) can also be found by pressing the [Details ...] button and selecting the "Fire protection" tab.Further information can be found in the manual for STAHL EC3.
AnswerThis is because the effective lengths or buckling lengths of bars and staff sets differ. While the actual length of the bars is used for the proof of stability, for bar sets it is the length of the combined bars.exampleThe frame shown in the picture (see picture 1) consists of a bar divided into 4 bars of equal length. In addition, a set of rods is created for the 4 rods. The proof of stability is carried out for both cases according to the substitute rod method.When dimensioning the bars, the length is calculated to be 1.00 m. In contrast, the rod set is 4.00 m long (see Figure 2). Of course, the difference in lengths has an effect on the stability rating, which means that the workloads also differ (see Figure 3)It is also not recommended to calculate all bars and sets of bars in a design case, as this leads to falsified results.
AnswerThis effect usually occurs in DUENQ cross-sections. When modeling the cross-sections, it should always be ensured that the inputs for height and thickness were not reversed for the elements (see Figure 1).
AnswerFor a vault-free cross-section, a proof of the complete system is recommended using theory II. Order - internal forces and local imperfections. The entry of the effective lengths and nodal bearings (with staff sets) can thus be omitted. However, please activate gamma_M1 for cross-section verification.
AnswerUnfortunately not. Intermediate supports and nodal supports have to be set manually. The default configuration for effective lengths is 1,0*member length and for set of members, one nodal support with definition u_y' and phi_x' is defined on each side of the set of member.To speed up the process of defining nodal supports, you can pick more nodes in one step by using the highlighted function in the attached picture.
AnswerThe modulus of elasticity of the material is reduced for the proofs according to EC 3, but not for the internal forces, since this is not intended according to the method of DIN EN 1993-1-2. It is always assumed that the structure is cold. In the calculation of the internal forces, one has to take into account only the internal constraint of temperature stress, if this is present.
AnswerThat is correct. For the verification of the relevant components, these must be defined as rod sets and selected for design. It is also important that in the design case of the wölbkraftanalyse no bars are selected for the dimensioning, which are either already included in the staff sets or claimed to torsion, since the module RF- / STEEL EC3 then want to measure these by means of replacement rod method and this possibly no proof due to the torsion is possible and the warning appears.
AnswerA dimensioning of cold-formed, thin-walled components and sheets according to EN 1993-1-3 is not possible with RF- / STEEL EC3.
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