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Frequently Asked Questions (FAQ)
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AnswerIn the general printout report selection, you can only define the load cases to be displayed for results for all result types. Sometimes, however, it makes sense to differentiate this setting depending on the result type (for example, support forces of all load cases, internal forces should only be output by the governing load cases).On the one hand, this can be set with the special selection per result type (right-click the corresponding entry in the navigation tree).On the other hand, all load cases can remain selected in the general selection, and all unnecessary load case results are then removed manually from the navigation tree.This manual selection can be overridden in the global settings. The corresponding option "Overwrite individual settings" appears here.
If the result beam is defined correctly, there may be a coarse FE mesh in the lintel area, which leads to rough inaccuracies in the results (in this case, shear forces, see Figure 1).
It is recommended to create about ten finite elements above the height of the door opening. For example, if the height above the door opening is 0.5 m, a target FE mesh width of 0.05 m is adequate in this area so that the desired results are achieved (see Figure 2: Shear forces).
The settings are set globally (Menu → Calculation → FE Mesh Settings) or by using a local FE mesh refinement.
AnswerIn the viewer mode, all results, including the module results in the printout report, are available to you.However, there are the following restrictions:It is not possible to carry out any calculation, editing, saving, as well as import and export. Additionally, no modules can be started.
AnswerThe results of the RF-/DYNAM Pro add-on modules Forced Vibrations , Nonlinear Time History and Equivalent Loads are not listed directly in the printout report. This is generally due to the fact that a lot of data and results are required for dynamic calculations.In each of the mentioned modules, it is possible to create a result combination with the envelope results. In this generated result combination, you can find the same results as in the main programs and display them in the printout report as usual.Additionally, you can print pictures in the printout report as usual. There is also an option to display the time history graphically in the printout report.
AnswerThere is no program file size limit if you are using a 64-bit system and the 64-bit version of RSTAB 8 or RFEM 5.The 'Limit' is determined by the computer configuration.It may happen that the available random access memory plus the virtual memory defined in Windows (free memory space) is insufficient. In this case, the computer configuration can be optimized (more random access memory, more free hard disk capacity).
The 'Design Details' button is only available or can be selected if the required reinforcement has been selected from the ultimate limit state (ULS).As soon as the governing reinforcement consisting of ULS and SLS or only the SLS is shown in the results tables, the "Design Details" button is grayed out.You can select the design details for the serviceability limit state in Tables 3.1 - 3.3.
AnswerThe RSTAB and RFEM software have two axes for asymmetric, open or arbitrary sections. After the calculation, the results for the main axes are displayed. The user may, however, specify the desired base coordinate system for displaying the vectors. Just check one of the two box options between 'Main Axes' or 'Member Axes' in the Project Navigator - Results.
The differences between the two modules are explained in this FAQ .
In general, you should also calculate the same results for both add-on modules if the settings are identical. However, this does not apply to existing nonlinearities. This is because no nonlinearities are considered in the RF-/DYNAM Pro add-on module. If the results are output via the Forced Vibrations add-on module, all nonlinearities are ignored. In contrast to this, the equivalent loads are calculated on a linear system, but the exported load cases are then calculated on the real system, that is, with all nonlinearities in RFEM or RSTAB . This may lead to inconsistent results.
If you deactivate the nonlinearities for the exported load cases, they should have identical results.
The way of considering nonlinearities in the response spectrum analysis is described using the tension members in this FAQ.
AnswerIn general, all result combinations can be designed with the RF‑/TIMBER Pro program. However, there is the special feature in timber construction, that the governing load combination is not the combination with the largest internal forces due to the load duration class (LDC).In the case of the result combinations, it is necessary to distinguish between 4 basic types of combinations.
In this respect, there is a special feature of the combination from the RF‑/DYNAM Pro add‑on module. In this case, the results are constantly superimposed and additionally squared. However, these combinations are then comparable with the third combination mentioned above.Results used in TIMBER Pro for each result combination.
- Permanent and additive (+/-) superposition of all actions.
- Actions different in permanent or variable, but additive (+/-) superposition.
- All actions permanent, but superimposed with 'or'.
- All actions variable, but superimposed with 'or'.
- The maximum moment in the attached file is used. The 'Short' LDC is correctly taken into account.
- In a simple example, the moment is correctly taken into account. However, a support moment on the continuous beam can be taken into account incorrectly. The LDC in RC2 is considered as 'permanent' by default. Therefore, the design becomes very unefficient and must be changed in this case (see Figure 02). However, 'permanent' might be correct for the continuous beam mentioned above.
- In the case of RC3 and RC4, there is a pure result evaluation, which is possible in all design modules.
This is because no results have been selected. If at least one check box is activated which leads to results, the members are also displayed.
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