Issue with Load Transfer in Multi-Level Load-Bearing Wall Modeling

[antonio_rh]

Hello everyone,

I’m currently facing a challenge in my structural model involving load-bearing walls across multiple levels. When I model the load transfer from the slab to the wall, it occurs uniformly as expected. However, when the load is transferred to the next lower level, it behaves as a point load rather than a uniform one. Additionally, when I model a wall on top of a slab, the wall behaves like a support.

Has anyone encountered a similar issue or can provide insight into why this might be happening?

Any advice or suggestions on how to resolve this would be greatly appreciated.

Thank you in advance!

[Rafacascudo]

Mesh size is probably too large. Forces  are transmited by the mesh nodes . If there are only the corner nodes ,than it will be concentrated.

Try to reduce the mesh size to get better results

[antonio_rh]

Thank you for the suggestion. I did reduce the mesh size for the walls, which indeed created more nodes and more concentrated point loads. However, the issue persists when the wall is placed on top of the slab. The slab doesn't behave as expected; it seems to partially support the wall, causing the bending moments to reduce significantly—up to five times less than they should be.

I’m still facing issues with the accurate representation of wall behavior and load transfer. Any further advice on how to resolve this would be very helpful.

[Rafacascudo]

zip and attach the model  ,telling where the problem lies

[antonio_rh]

"The file 'wall test' includes the modeling of the walls and the load transfer from the second-level slab through the walls that discharge onto the first-level slab. When reviewing bending moments in Mxx, there is a reduction of moments in the central part due to the wall.

In the second model "wall test external loads", the loads from the wall's weight and the discharge from the second floor are simulated. In this case, higher values are reached, which differ from the wall modeling results."

[Rafacascudo · Accepted solution]

That seems to be right as you have 2 strong walls supporting ,to some extent ,the wall that discharges some of its load on the slab beneath it. It is easy to see that effect when showing the principal wall forces graphically

If you want to discharge the whole wall load on the slab below , then you have some options to do it , described in my post on this thread

https://forums.autodesk.com/t5/robot-structural-analysis-forum/efficient-modelling-of-nonstructural-...

Also check another thread link inside my post on the thread above.

Orthotropic slab seems to be your best option

[antonio_rh]

Thank you so much for your solution! It worked perfectly, and the issue has been resolved. I appreciate your help and the time you took to guide me through this problem