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Staad Pro V8i Foundation Compression Only Automatically being unchecked

Rharting
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I often use the compression only function of the foundation elastic mat with a specified subgrade modulus. However, I have found over and over again that Staad is automatically unchecking this box and reverting back to allowing uplift reactions if any change is made to the model. For instance, if I run an analysis with compression only then want to modify a load, I go back to model and modify the load and run the analysis however the compression only portion is removed.

Has anyone else had this issue? Is there a solution to this?

Thanks in advance.

Ryan

  • 0
    I tested this scenario using Staad.pro 20.07.10.64 along with the EXAMP23.std file. I checked the compression-only behavior initially, then change a load as you noted and rechecked things. In my tests the compression-only setting for the Supports is saved and the analysis produces correct results.
    Please send in a sample file where you experience the problem in case is has to do with the order of the commands. Also please confirm the version you are using.



  • 0 Offline
    I tested with version 20.07.10.65 and it seems to work fine as well. I do vaguely remember encountering this issue in an old version. So the version is most likely the culprit in your case. An easy workaround would be to add the word COMPRESSION at the end of the command line using the editor as shown next

    SUPPORTS
    1 TO 50 ELASTIC MAT DIRECT Y SUBGRADE 10 COMPRESSION



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