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Frequently Asked Questions (FAQ)
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In order for the program to calculate the failure due to tension, the "Net Cross-Sectional Area" function must be activated in the "Parameters - Members" window.
In order to consider the failure of certain members when using RF‑/DYNAM Pro – Equivalent Loads, proceed as follows:
1) Deactivating the corresponding members for the eigenvalue determination within the corresponding load case, see Image 01 (add-on module, tab Natural Vibration Cases, Calculation Parameters) and Image 02 (main program, Calculation Parameters, Deactivate and select).
2) Determining dynamic load cases from RF‑/DYNAM Pro by using the calculation, then deactivating the corresponding member in the main program within the global calculation parameters of the dynamic load cases, see Image 03.
AnswerThere are two options for defining the failure:
- Assignment of member nonlinearity
For the member types "Beam" and "Rigid", you can define a member nonlinearity for each member. You can find the corresponding option in the "Settings" tab (see Figure 01).
- Assignment of nonlinear member hinges
Alternatively, you can define a member end hinge with failure criterion for the member. For the desired degree of freedom, you can assign the hinge condition with nonlinearity accordingly (see Figure 02).
- Assignment of member nonlinearity
Define the ineffective foundation in the "New Member Elastic Foundation" dialog box, see the figure.
The positive and the negative direction refers to the axis system of the line release. The forces, such as vz, are related to the object on the original line.
In the following, the definition will be briefly explained by using the example of a release between a wall and a ceiling. If the wall is the released object, the definition of a failure for the lifting load would be as follows:
- Between the floor slab and the wall, the "Fixed if negative vz" nonlinearity should be selected.
- Between the wall and the ceiling above, the "Fixed if positive vz" nonlinearity should be selected.
If the failure is defined incorrectly, you can check it using the determined deformation diagram.
The dialog box for defining the soil profile is deactivated when deactivating the dependent designs in the detail settings.
It is not required to enter a soil profile for the following design types:
- Ground failure resistance according to EN 1997-1, Annex D
- Sliding design
- Settlement calculation
As soon as you activate one of the options mentioned above, the dialog box for entering the soil profile will also be available again.
There are two ways to do this:
- You can define the corresponding member as a null member. Thus, it is not considered in the calculation of all load cases and load combinations.
- You can deactivate the corresponding member in all or only for certain load cases and/or load combinations. To do this, it is necessary to activate the "Modify stiffnesses" option in the calculation parameters of the load case or load combination. Then, you can deactivate this member in the additional tab window.
However, you should pay attention to the following points:
- When using the null member, a warning message appears if the member loads have been defined.
- In the case of generated loads, the loads are redistributed automatically when using the null member.
- If deactivating the member in the calculation parameters, the member loads and the determined generated loads are not considered. No error message appears in this case. It is necessary to redistribute the loads manually.
AnswerSimilarly to surfaces, there are various smoothing options for displaying the results of support reactions. For a nonlinear support, you should always select the actual distribution to display the results.
AnswerIn the "Edit Load Cases and Combinations" dialog box, you can specify in the bottom right of the "Combination Expressions" tab which method of analysis should be used as the basis for the generated load combinations. By default, the linear calculation according to the geometrically linear analysis is preset for load cases and the nonlinear calculation according to the second-order analysis for load combinations.Thus, you can quickly determine whether the load case or the load combination is calculated according to the geometrically linear, second-order, or large deformation analysis. The postcritical analysis option allows you to carry out the stability analysis according to the large deformation analysis with regard to the post-critical failure of the entire structure.In case the model includes cable members, the calculation according to the large deformation analysis is preset in all cases.
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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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