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Frequently Asked Questions (FAQ)
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The elements can be connected with the "Connect Elements" tool. To access the function, select Tools -> Connect elements or use the corresponding toolbar button. In the work window, simply draw a window across the area where the elements are to be connected (see Figure 2). It is not necessary to catch the objects completely.
If two members are hinged to each other, the corresponding release must be assigned to only one of these members.
If there are three members, which are all hinged, two of the three members will have the corresponding release.
Generally, a nodal point with a completely pinned design with an arbitrary number of member ends receives a total of one member hinge less than the existing number of member ends:
Number of member ends: n
Number of Member Hinges for Completely Hinged Connectors: n-1
Bei weniger als n-1 Stabendgelenken sind die jeweiligen Stabenden ohne Gelenk biegesteif miteinander verbunden.
Bild 1 zeigt drei Varianten eines Hauptträgers, an welchen ein Nebenträger anschließt:
Wird ein Stabendgelenk zuviel angesetzt, so kann es zum Abbruch der Berechnung aufgrund von Instabilität kommen. Demnach ist die oben beschriebene Regel zu beachten.
- Vollständig biegesteife Verbindung - kein Stabendgelenk
- Teilweise gelenkige Verbindung: Der Nebenträger schließt gelenkig an den durchlaufend biegesteifen Hauptträger an - ein Stabendgelenk
- Vollständig gelenkige Verbindung: Alle drei Stäbe schließen gelenkig aneinander an - zwei Stabendgelenke
AnswerWith the model check, members that cross each other but do not have a common node at the point of intersection can be found (see Figure 1). To check the model, select Tools -> Model check -> Opening or closing intersecting members.
The results are shown in the "Groups of Crossing Not Connected Members" dialog section. The crossing members are listed in groups; the current group is represented by a
The "What is to be done with" dialog section controls how the crossing members are handled. The "Connect members" option is suitable for actual transfer options for internal forces, but not for For example, for usual diagonal crossings with tension members.
Alternatively, it is also possible to use the model check to display the member pairs as an Excel list or to create visibilities. The visibilities created in this way can be quickly used to find and delete relevant members in the model.
AnswerIt is not allowed to transfer printout reports from one program to another. However, it is possible to include the SHAPE-THIN cross-section values and the SHAPE-THIN Cross tab with the RFEM or RSTAB printout report.To do this, open the printout report selection and add the cross-section details of the SHAPE-THIN cross-section, as described in Figure 1.
AnswerBasically, elements in RFEM are rigidly connected with each other. To solve this problem, RFEM provides two elements. The line releases and the line releases. The difference is explained in the link below.
AnswerIf the holes are subject to a regular grid, they may be defined by the composite cross sections (Figure 1).Otherwise it is still possible to reduce the cross section in the properties as a whole (Fig. 2).Thus, a flat reduction of the stiffness of the cross section is made. Unfortunately, it is not possible to distinguish between reductions in the compression and tension of the cross section.
AnswerThe design of wood joints with pin-shaped fasteners is currently limited to steel-wood joints according to Chapter 8.2.3. Pure wood-wood compounds on shear under consideration of the Johansen theory are therefore currently not possible. Direct wood-wood connections by means of full-thread screws are possible with the module RF- / JOINTS wood - wood to wood with which main secondary beam connections can be calculated.
AnswerIndependent submodels are not interconnected and are considered as separate submodels in the calculation. They are thus independent models without influencing each other (see Figure 2).It is recommended to edit submodels separately as individual files. Then a stability analysis with RSKNICK is possible.Otherwise, the partial models must be connected to each other. In this case, it should be taken into consideration that the static systems of the submodels should be retained when the submodels merge into an overall model (see Figure 3).The feature "Independent Systems" is helpful in detecting partial models. This finds all independent systems and lists them as groups (see Figure 4).One finds this function under Extras -> Model control -> Independent systems.
AnswerThere are many ways to tie a surface to rods in an articulated manner. On the one hand, the surface could be defined in a frame system or the like with an eccentricity and a coupling (Figure 1). This rigid rod is then connected articulated. This is explained in more detail in this article.As a practicable approximation, it may also be sufficient to connect the subsequent rods all articulated (Figure 2).Further options exist, for example, with the option of node sharing. This possibility is explained in more detail in this article.
There are basically two options:
- The use of member eccentricities, see Expertise Considering eccentricities of members and surfaces
- In the case of, for example, differently defined member hinges in combination with different dimensions of offsets, the use of couplings or rigid members may help, see Figure 1
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