Raft on piles

[M.hagag]

Hi all, I have a suspended raft on piles which is supported on some of its edges by basement walls, I noticed some piles reactions are way less than columns reactions they are supporting, my assumption is that due to the presence of the rigid retaining wall, anyone faced a similar issue , please refer to attachment for more detail

 

[Greenalleycat]

Are the walls underneath the slab or above it?

You have to be very careful with mixing and matching raft/piles and walls/strip footings
I have been dealing with a damaged house that has a basement with this system...the walls have settled far more than the piled foundations and there is now a 50mm+ hogging pattern in the floor and the 400mm thick slab is busted up

You haven't given enough information here to really understand the issue. All we can see is "potentially" the basement walls are contributing to the walls not matching what you expect...or it could be an error in your modelling....

 

[Ron247]

I assume the basement walls are under the raft. I assume the columns you mention are the solid shaded areas over the pile caps. I agree with Greenalleycat, mixing foundation systems tends to create an additional set of uneven settlement issues beyond the typical ones all structures face.

In addition to the difference in support, how reliable is the presence of the loads in each combination? To model 50 psf here with 30 psf there, and then get some different real-life mixture adds to the complexity.

Still need a better description of what is what in your drawing.