Cantilever vs. Butressed Foundation Wall

[BadgerPE]

Background:
45' wall warehouse. 15' tall foundation wall (full soil fill) with 30' tilt-up panel on top. No bracing for either wall. Built on weathered dolomite (qa=5,000 psf) so rotation of a cantilever wall is likely minimal.

Question:
Are there any quick rules of thumb for establishing which is more economical to construct? This is for preliminary discussion purposes only. I feel like the base moment will be rather significant at the base of the wall due to the soil/wind loads. Leaning toward buttresses at this point, but could be persuaded otherwise. Given the proximity to another building and the likelihood of future buildings, I don't think soil nailing or any other form of tieback would be acceptable.

**Edit: I meant to say counterfort as this would be on the soil-retained side. Sorry for the incorrect terminology.**

 

[Lomarandil]

Economy lies largely in the common practice among contractors in your area. I can't think of the last time I saw a buttressed wall formed up. How much length of wall -- will custom forms be a big cost?

On the other hand, to have the rotational stiffness I'd want to support that 30' tilt up wall, buttresses sound a lot better than a cantilever wall in flexure.

When you say "no bracing"... what happens at the top of the tilt-up wall?

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just call me Lo.

 

[BadgerPE]

About 550’ of wall....why do I need bracing at top of the tilt-up wall?...haha. There is a diaphragm at the top. Should have said no bracing below the diaphragm level so the foundation wall need to be “fixed” for stability.

 

[Lomarandil]

OK, we're on the same page.

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just call me Lo.