ISSUE IN WALL ABOVE MODELING ON PICK UP BEAM IN SAFE

[Hamid2019]

thread802-237298

Hi Every body;

I have a safe model with wall above that it is settled on pick up beam in the slab, I have got amazing output for moment diagram of beam (see attachment).

Would you please take a look on this issue and help me how I have to consider wall above on a beam on slab in safe program?

Thanks

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1555430144/tips/BEAM_MOMENT_DIAGRAM_ks2hib.pdf[/url]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1555430153/tips/Model-SAFE_qmsnaw.pdf[/url]

 

[JoshPlumSE]

This sort of thing happens a lot in FEM analysis. Here's what you're seeing:
1) The wall consists of a number of plate elements, everywhere one of the plate elements connects to the beam you will see a spike in the shear diagram of the beam.... Because that's where vertical load is being transferred between the beam and wall.
2) In the FEM model, the wall is actually significantly more stiff than the beam. So, the beam isn't really supported the wall. It's more like the wall is supporting the beam (at least in the model).

What to do?
3) My tendency is to ignore the local FEM output for this beam and manually design it to support the vertical load that comes from the wall. This is certainly conservative.

4) There is a lot to be said about deflection compatibility between these two elements. So, there may be some extra detailing between the two elements required just to make sure you don't get too much cracking or separation at that location. Or, so that you can manage the deflection / separation that does occur.