Creep and Shrinkage Static Analysis in RFEM 6

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1

Hi,

For my MEng thesis, I am analyzing localized models of a flat slab. My aim with these models are to assess the deflection and rotation of the slab under creep and shrinkage. However, each time I run my analysis, i get a failure/error message which says the load combination could not be calculated/executed.

  • I have selected the correct analysis type in the Load Combinations dialogue box i.e. Static Analysis (Creep and Shrinkage|Linear)
  • I have ticked/selected Creep & Shrinkage in the material and cross section/thickness dialogue boxes.
  • I have also enabled non-linear material behavior and time-dependent analysis in the model Base Data.

Previously I created a different slab column local model where i selected the exact same settings, and the creep and shrinkage load combinations seem to calculate in that model but not the current one i am assessing. Could you please advise on how to rectify this error. The model is attached below.
MEng Thesis-Parkade- Column C133-C25-C53.rf6 (1.3 MB)

2

Hi AzharHoosain,

Thank you for your inquiry.

If you want to account for creep and shrinkage in the ULS under the sustained load from the quasi-permanent combinations, you need to take the following steps.

  1. Turn off the Combination Wizard. (Image 1)

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  2. Set the load cases to 'Static Analysis' (Image 2).

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  3. You can then select the combination as desired (Image 3).

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Alternatively, you can select only permanent load cases directly in the combination. Please see the following image.

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Best regards,
Bastian Kuhn

3

Hi Bastian,

Thank you for your reply. I tried the above mentioned, however, that still does not seem to resolve the issue. For some reason, the analysis is unable to run and I end up with an error as shown below.

image
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I noticed that if i de-select "shrinkage" in the time dependent properties dialogue box (leaving only "Creep" selected) then the analysis runs. With both "Creep" and "Shrinkage" selected, the analysis fails.

Regards,
Azhar Hoosain

4

Hi AzharHoosain,

hm that`s strange. Could you please update the programm to the current version 6.15?

Which Option did you choose first or second I described in my previous post?

If it still doesn`t work please send me updated model.

Best Regards

Bastian Kuhn