Which result combinations can I design with the RF‑/TIMBER Pro program and what should I pay attention to?

Answer

In 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.

  1. Permanent and additive (+/-) superposition of all actions.
  2. Actions different in permanent or variable, but additive (+/-) superposition.
  3. All actions permanent, but superimposed with "or."
  4. All actions variable, but superimposed with "or."
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.

  1. The maximum moment in the attached file is used. The "Short" LDC is correctly taken into account.
  2. 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.
  3. In the case of RC3 and RC4, there is a pure result evaluation, which is possible in all design modules.



Keywords

LDC Result evaluation Permanent Short

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RFEM Timber Structures
RF-TIMBER Pro 5.xx

Add-on Module

Timber design according to Eurocode 5, SIA 265 and/or DIN 1052

Price of First License
1,120.00 USD
RSTAB Timber Structures
TIMBER Pro 8.xx

Add-on Module

Timber design according to Eurocode 5, SIA 265 and/or DIN 1052

Price of First License
1,120.00 USD