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Frequently Asked Questions (FAQ)
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AnswerNonlinear material models are only available in the 3D environment. Please make sure that the model type is set to "3D" (see Figure 02).
AnswerPrevious program versions can be downloaded from the menu item 'Support and Training' of the Dlubal website (see the Figure). You can find the relevant link below this FAQ.
You have a license of the program SHAPE‑THIN 7 or SHAPE‑THIN 8. Your service contract includes all updates within these program versions.
However, SHAPE‑THIN 9 is a fee-based upgrade. Our sales department will make you an offer for the program switch.
In RFEM and RSTAB, the simplified design from , Chapter 2.2.3, have been implemented for the automatic load combinations. This means that, strictly speaking, the structures concerning the final deformation may only be analyzed, in which the materials with identical creep behavior occur since the creep deformations are considered in a simplified way on the load side. If the structure is a combined structure made of timber with different creep behavior or in combination with steel, the final deformations must be determined according to  Amendment to 2.2.3 as follows:
"(4) If the structure consists of members or components having different creep behaviour, the long-term deformation due to the quasi-permanent combination of actions should be calculated using final mean values of the appropriate moduli of elasticity, shear moduli and slip moduli, according to 126.96.36.199(1). The final deformation ufin is then calculated by the superposition of the instantaneous deformation due to the difference of the characteristic and quasi-permanent combinations of actions with the long-term deformation."
However, this requires the superposition of the results from different load combinations, which cannot be implemented automatically in RFEM and RSTAB. If the different creep behavior should be taken into account, it is necessary to create the load combinations manually, and reduce the stiffness according to the creep coefficient. The procedure is described on an example of a timber-concrete composite floor presented on the Info Day 2017. Below this FAQ, you can find the link for this video.
AnswerTo display the isosurfaces of the results in monochrome, you have to edit the color scale. To do this, simply double-click the color scale or edit the color scale with the right mouse button (see Figure 01). The slider can then be pushed down so far that only one color remains. This can be changed by double-clicking the color. Then, the maximum value can be transferred manually to the penultimate input field (see Figure 02). If you want a colorless display, define a very small number for the penultimate value. It is also recommended to activate the ‘Outlines of Deformed Surfaces’ option (see Fig. 03).
AnswerThe increase of the crack factor kcr still has to be done manually because the program does not know where the end of the grain is defined. To do this, divide the member by 1.5 m from the end of the grain so that the affected areas can be designed as a separate member (see Figure 01).Two design cases are now required (File → New Case ...). In case 1, members within the 1.5 m are selected for the design. In case 2, it is necessary to select the members where the 30% needs to be considered. Then, in case 2, the kcr value is adjusted manually in the settings for the National Annex. Thus, a kcr of 0.65 results for C24, which is entered as shown in Figure 02. The design is carried out this way with an increased kcr value.
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 buckling analyzes of members according to the second-order analysis with seven degrees of freedom and a form of imperfection affecting the mode shape.You can find more information in the links below this FAQ.
AnswerTo consider average regions when designing in RF-LAMINATE, they must always be activated in the detail settings of the add-on module. See Figure 01 with the detailed settings in RF-LAMINATE for this.
The definition of surface supports should be as realistic as possible. Experience shows that the equation solver works most effectively with this. To simplify matters, degrees of freedom are often defined as 'fixed'. However, this can have a big impact on the overall stiffness matrix and cause numerical problems (see Figure 01).
It is better to work with springs in order to avoid the numerical problems. It is often sufficient to define very stiff springs (see Figure 02). The same applies to the foundation perpendicular to the surface. You can find more information in  and in the links below this FAQ.
To do this, select the checkbox in Table 1.2 Geometry in column J (see Figure 01).Then, it is possible to view the release definitions in the 'Hinges' tab (see Figure 02).If you want to modify the hinges, you have to set the support type to 'User-Defined' in the 'Support' tab. The releases can then be freely defined (see Figure 03).
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Wind Simulation & Wind Load Generation
With the stand-alone program RWIND Simulation, wind flows around simple or complex structures can be simulated 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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