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Originally Posted by Arm&Kedzie
Apparently none! I can't think of another supertall that has split foundations, i guess i'm in the minority who finds this interesting.
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No, I'm sure we all find it interesting, I'm just not sure that it's too surprising given the engineering challenge of spanning a roadway. I have a feeling there will be some pretty hefty structural members connecting the two halves together between the different roadway levels. That would essentially serve the same purpose as having a mat or sleepers tied together at ground level. Let's face it, Chicago's mud isn't doing anything significant to hold up a building of this size anyhow, so it shouldn't matter if the structural connections are one floor off the ground or 5' into the dirt. It's not like the mat itself is preventing settling, it's just tying the cassion tops together and, if there are no cassions under lower field, then there is nothing to tie together under lower field and the two mats can be linked above grade.
In any case, things are about to get even more interesting as I'm sure there will be some structural acrobatics with this one until we get a few floors above upper Wacker.