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Frequently Asked Questions (FAQ)
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Answer
If you use the "Within cuboid  general" integration option, the reason may be incorrectly defined parameters for the application area. The application lengths must be entered as an amount. This is especially important in the negative direction: If you enter the application length as a negative value, this value is subtracted from the positive direction.Example: You want to define an integration area of 1 m for the result beam. For the "Within cuboid  quadratic" option, simply enter an application length of 1 m. In the case of the "Within cuboid  general" option, you have to enter a length of 0.5 m as the amount in both the positive and the negative direction. These lengths are added together and you get a total application area of 1 m. 
Answer
You can activate the display of the local axis system of members either by rightclicking a member in the member shortcut menu or in Project Navigator  Display.
Figure 01  Activating Local Member Axis Systems
Member internal forces are displayed with regard to the member axes or the principal axes (FAQ 003291).
You can also find the definition of member internal forces in the online manual.

Answer
If you want to display the results at a specific location of the crosssection, it is necessary to divide the element at this location.
To divide the element, rightclick it and select the "Divide Element" option in the shortcut menu (Figure 01).
For example, if you want to determine the stress at a distance s = 32.5 mm from the start of Element 1, you have to divide Element 1 at this point. This is also shown in the video.

Answer
This change can be done in the Display navigator under "Results" → "Deformation" → "Members" → "Lines," see Figure 01.

Answer
The "Extended Display" button allows for a targeted evaluation of the results for each stress point. It opens the "CrossSection Properties and Stress Distribution" dialog box (Figure 01).
Figure 01  CrossSection Values and Stress Diagram
In the "Position" section, the current member number and location x on the member are preset. You can also select other members or x‑locations in the list.
The "Stress Points" section lists all stress points of the crosssection. The "Coordinates" columns show the centroidal distances y and z, and the "Static moments" columns show the surface moments of the first degree S_{y} and S_{z}. The "Thickness t" column shows the thickness of the crosssection part that is required for the determination of shear stresses. In the case of closed crosssections, the cell area A* is specified, which is required for the determination of the stress due to torsional moment.
The "Stresses" section shows all stresses at the current stress point (selected in the section above). In this dialog box, it is also possible to select a stress type by a mouse click to display the stress diagrams in the graphic.

Answer
In the detail settings of the respective result beam, you can specify which objects (members, surfaces, or solids) are to be considered by this result beam.
For example, if there is an unexpected result displayed for the result beam, you should check in this dialog box whether the integration area has been set correctly for the objects.

Answer
There are two ways to display result values:
 Click the "Show Result Values" button in the toolbar (see Figure 01).
 Activate the result values in the Display navigator under "Results" (see Figure 02).

Answer
This information is available in the Results navigator for members (see Figure 01). The member lengths are displayed with regard to the stressed structural system and the unstressed system. The "stressed length" is obtained from the formfinding under consideration of prestresses.
The recalculation to the "stressed length" can be done manually using Hooke's law:
${\mathrm l}_{\mathrm{unstressed}}\;=\;{\mathrm l}_{\mathrm{stressed}}\;\;\mathrm{Δl}\\\\\mathrm\sigma\;=\;\mathrm E\;\cdot\;\mathrm\varepsilon\\\frac{\mathrm F}{\mathrm A}\;=\;\mathrm E\;\cdot\;\frac{\mathrm{Δl}}{\mathrm l}\\\mathrm{Δl}\;=\;\frac{\mathrm F\;\cdot\;\mathrm l}{\mathrm E\;\cdot\;\mathrm A}\\\\{\mathrm l}_{\mathrm{unstressed}}\;=\;{\mathrm l}_{\mathrm{stressed}}\;\;\frac{\mathrm F\;\cdot\;{\mathrm l}_{\mathrm{stressed}}}{\mathrm E\;\cdot\;\mathrm A}\;=\;{\mathrm l}_{\mathrm{stressed}}\;\cdot\;\left(1\;\frac{\mathrm F\;}{\mathrm E\;\cdot\;\mathrm A}\right)$

Answer
Yes, it is possible.
The result tables show in color whether there are the positive or negative internal forces and what is the relation to the extreme values. The negative values are symbolized by red bars, the positive ones by blue bars. Thus, the table also allows for a visual evaluation of results.Figure 01  Table "Internal Forces  Members" with Colored Reference Scale
The result tables of the design modules use color scales to represent the respective design ratios. In this way, the governing locations are apparent immediately.

Answer
The message shown in Figure 01 is displayed if you select the "Minimum distance between stiffeners: 30 ε t" check box in Details and the clear distance between the stiffeners is smaller than this minimum distance a_{min}. The minimum distance is calculated as follows:
a_{min} = 30 ⋅ ε ⋅ t
where
ε = √(235 / f_{y }[N/mm²])f_{y} is the yield strength,t is the thickness of the buckling panel.
In this case, the distance of the stiffeners must be increased in Window "1.2 Stiffeners." For the buckling panel shown in Figure 01, the clear distance between the stiffeners is:
Δz = z_{2}  z_{1}  (t_{1} + t_{2}) / 2 = 890  600  (10 + 10) / 2 = 280 mmThis distance is smaller than the minimum distance:
a_{min} = 30 ⋅ ε ⋅ t = 30 ⋅ √(235 / 355) ⋅ 12 = 292.9 mmTherefore, the position of Stiffener 2 should be entered at least
z_{2} = z_{1} + (t_{1} + t_{2}) / 2 + a_{min} = 600 + (10 + 10) / 2 + 292.9 ≈ 903 mm
This distance is also displayed as information in Window "1.2 Stiffeners" when placing the mouse pointer over Stiffener 2 (Figure 02).
Figure 02  Proposed Position of Stiffener
If the calculation should also be performed for a stiffener distance smaller than the minimum distance, the "Minimum distance between stiffeners: 30 ε t" check box must be deactivated (Figure 03).
Figure 03  Deactivating Option "Minimum Distance Between Stiffeners"
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First Steps
We provide hints and tips to help you get started with the main programs RFEM and RSTAB.
Wind Simulation & Wind Load Generation
With the standalone 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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