https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/158562/ram-concrete-vs-frame-forces-for-columns-not-matching
I understand that the analysis methods are different between the two modules, however the difference in axial gravity dead loads between the two can be drastic in some cases. What is the primary reason for this in the program?
Transfer slabs I suppose lead to the greatest difference.
Answer Verified By: Eric Feuge-Miller
It seems rather extreme if that's the case, possibly a setting needs to change?Below is a shot from the Rz DL reaction from Frame:
Below is a shot from the Level 1 Dead reactions in Concrete Analysis:
From what I can tell there is a shifting of DL in some areas, but the greatest difference is the 3rd and 4th line of lateral columns from the top.
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Take a look at the deflected shape in RAM Frame. You'll see the "cantilever" slab at the roof deflecting a lot under gravity load because those gravity beams are not considered in Ram Frame analysis, but the gravity beams are an essential part of the support for the 2-way slab. Those gravity beams are considered in the Ram Concrete analysis, and the deflections are much more reasonable there. This also changes the overall load path to the columns, So, proceed with the Ram Concrete analysis or make those beams all lateral.
I knew it was something so simple. Thanks Seth!
Results from changing the beams at the Roof from Gravity to Lateral w/ pinned connections.