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Frequently Asked Questions (FAQ)
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AnswerYou have probably forgotten to define "extra bolts" in the upper and lower flange of the beam for the end plate connection. If this function is not activated, JOINTS only allows you to arrange the bolts within both beam flanges.
AnswerIn RF-/JOINTS Steel - Rigid, the design is implemented according to EN 1993‑1‑8, Section 6.2.7, Equation 6.24. If the design axial force exceeds 5% of the plastic resistance Npl, Rd, Equation 6.24 applies.
AnswerThe design of a rigid connection of this type without a web stiffener or an end plate is only possible with the JOINTS Steel - Rigid add-on module. You can find an example under Downloads below.
AnswerThe option to enter a taper on a beam can be activated in the Arrangement section of Window 1.4 Geometry. Here you can model the taper on the bottom or top side of the beam.The plate thicknesses as well as the height of the taper are defined by selecting the cross-section of the taper, since the cut rolled cross-sections are often used, for example. If user-defined plates are used, you can select a parametric T‑section. The length of the taper as well as the material are entered in the same section. The weld thicknesses for connecting the taper to the beam can be defined in the Welds section.If there is a tapered member already used as a beam (entered in the "Nodes and Members" section by specifying different cross-sections and lengths), it is not possible to model an additional taper.
AnswerIn addition to geometry input errors, this discrepancy is usually caused by a different calculation basis of both add-on modules.The design of an end plate joint with the RF‑/JOINTS Steel - DSTV add-on module is carried out by comparing the saved ultimate limit states with the design internal forces. The underlying resistances are taken from the current DSTV guidelines.When using the RF‑/JOINTS Steel - Rigid add-on module, the joint resistances of are calculated according to DIN EN 1993‑1‑8 by means of the component method. Thus, you can directly affect the results via the settings you have made.In this case, an elastic distribution of bolt forces is used as a basis by default. By selecting the plastic force distribution in the joint, you can activate additional load capacities. These are already included in the ultimate limit states according to the DSTV guidelines.In order to obtain the comparable results between both add-on modules, it is necessary to apply the plastic force distribution for the calculation. Furthermore, you should pay attention to the correct modeling of the joint geometry.
The geometry depends on the definition of the structural components. In Window "1.2 Nodes and Members," there is the specification of which member is calculated as a column and which one as a beam. The program always recognizes the column as a continuous structural component by default (see Figure 01).In order to make the beam continuous, simply change the status of the individual members (see Figure 02). The actual beam will have the "Column" status and the actual column will be defined as a "Beam."
AnswerIn the current set of rules, fasteners or connections are always designed in one plane only. The reason for this is that the designs for shear etc. can only be analyzed in the 2D plane. The design of bearing, for example, is not possible for a failure from the plane.Since internal forces in vy and vz can always occur in a three-dimensional calculation, it has been proven in practice to allow a small proportion of internal forces in secondary direction and not fully utilize the connection. However, if the ratio of shear force in secondary direction is too high, a detailed analysis with an FE simulation might potentially be necessary.
The easiest way to find the internal forces at these nodes is to print the graphics of the members in the printout report.
If this solution is not possible, you can also find the values in the results table 4.1 in the printout report. Since the extreme values are only activated by default, it is still necessary to activate the nodal values in the selection.
It is usually not reasonable to include the internal forces of all member in the printout report. Therefore, you can only select the members that are relevant to you.
The designs with our RF-/JOINTS Steel-Rigid module are based on the assumptions and regulations of the EN 1993-1-8 standard. The bending from the main bearing plane is not considered here. This is also displayed as a note during the design.
With RFEM, it is possible to model any rigid joint. All internal forces can be considered there. You can find an example file in the appendix to this FAQ.
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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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