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Transfer Slabs and Frame & Concrete Modules

VBWGE
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Hi,

As per the RAM SS Import table there are options to input transfer loads either from RAM FRAME or RAM CONCRETE. Obviously, since these 2 modules have rather different way to calculate the distribution of forces the results are quite different. In practical situation, it is not guaranteed that transfer floor (usually ground floor) will be propped until the whole building is constructed (more so in buildings over 5 stories high) so transfer forces will often be somewhere in between 'ideal' frame situation or simple 'tributary area' load down.

In this situation, there is a real need to have a sequenced construction to be analyzed by the software. What do developers of RAM SS suggest?

  • 0
    We don't have load sequencing, but it's fairly easy to take a full RAM SS model and chop off one or a few of the top stories and then re-check the transfer level, including a re-check of the linked Ram Concept model. That's probably the best you can do now short of manually editing the loads.



    Answer Verified By: VBWGE 

  • 0 Offline in reply to Seth Guthrie
    Seth,
    Could you please elaborate how that would be similar to non-linear staged analysis (ie give some examples)
    Also, could you advise if you are planning to add this module in the future.
  • 0 in reply to VBWGE
    There nothing really non-linear about it, but you could model variations of the structure of different heights to examine the forces or behavior before it's complete.
    It's something we would surely like to have in the software, but a pretty major undertaking and not commonly requested, so it's not at the top of the list right now. If you have any particular ways you would like to see such a thing implemented, please send over those ideas.



    Answer Verified By: VBWGE 

  • 0 Offline in reply to Seth Guthrie
    Seth,

    I have following situation:
    5-storey building with transfers at each floor. First 3 floors are going to be fully propped until L3 is completed and 100%cured.
    In this situation, Ram Frame gives totally different results to RAM Concrete. Since first 3 floors are propped, I believe that 3 lower floors can develop a full frame.
    How to analyze this sort of situation? Can RAM Frame module be used for transfer loads? Alternatively, I thought to chop off last 2 floors of the building and analyze bottom 3 floors as frame with transfer loadings on LVL3 applied manually. Levels 4-5 would be analyzed separately using Ram Concrete module.

    Please let me know your thoughts.
  • 0 in reply to VBWGE
    The analysis in Ram Concrete is always done one level at a time, where the results of a top level are basically added to the results of a lower level. This approach is great for most types of structures, but limited when it comes to multi-story transfer situations where the macro structure of columns and slabs is basically a Vierendeel truss. Only Ram Frame (within the Ram Structural System suite) can deal with the full 3D model in a single analysis step. You can certainly run the whole thing in Ram Frame (all relevant columns will need to be lateral), and you can design concrete columns for those Ram Frame forces in lieu of the Ram Concrete analysis results if that helps. Ultimately, running different models with different sets of stories present is the best way to envelope the worst condition.



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