pick best foundation expansion detail (see attached)
pick best foundation expansion detail (see attached)
(OP)
What do you think is the best existing foundation expansion detail? (see attached
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pick best foundation expansion detail (see attached)
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RE: pick best foundation expansion detail (see attached)
http://www.nceng.com.au/
"A safe structure will be the one whose weakest link is never overloaded by the greatest force to which the structure is subjected" Petroski 1992
RE: pick best foundation expansion detail (see attached)
BA
RE: pick best foundation expansion detail (see attached)
RE: pick best foundation expansion detail (see attached)
RE: pick best foundation expansion detail (see attached)
I don't think the combined footing (new+existing) will take the total load....The existing footing will only pick up a share of the new load (if any, due to them being tied in).
RE: pick best foundation expansion detail (see attached)
BARetired - I guess I meant I am expanding the width of the foundation :) Do you think adding expansion capability is needed here? how would it be achieved?
hokie6 - you said "just consider the dowels as transferring incidental shear" why do say incidental? development of shear transfer between two footings is one of my main concerns. The new masonry stemwall may be sitting entirely on top of the existing footing, although I could use a larger width block to provide a little bit of direct bearing on the new footing. Maybe I should detail 1/4" amplitude intentional roughening of the side of the existing footing?
slickdeals - why do you say they cannot act as a composite footing to take all applied loads together?
A is of course the easiest and what I would like to go with if I can develop load transfer between the two footings.
B was an attempt to utilize the concrete shear capacity in the shear transfer
C complete underpinning. any experience how this would be easily constructed? how do you shore the structure?
RE: pick best foundation expansion detail (see attached)
You would still run the risk of some settlements as this progresses.
RE: pick best foundation expansion detail (see attached)
RE: pick best foundation expansion detail (see attached)
Is this a suspended slab bearing on the masonry or slab on grade?
Would you guys underpin if this were a masonry bearing wall or a column location?
Sorry don't mean to hijack the thread.
EIT
RE: pick best foundation expansion detail (see attached)
http://www.nceng.com.au/
"A safe structure will be the one whose weakest link is never overloaded by the greatest force to which the structure is subjected" Petroski 1992
RE: pick best foundation expansion detail (see attached)
My comment about "incidental shear" assumed relatively light loading, which I inferred from your section showing stud walls above. And yes, I would roughen the edge of the existing footing, but I wouldn't depend on the dowels to transfer moment.
If heavy dead loading is involved, I would reconsider and possibly underpin, depending on the soil conditions. What are the conditions? For all we know, it could be mud or rock.
RE: pick best foundation expansion detail (see attached)
RE: pick best foundation expansion detail (see attached)
RE: pick best foundation expansion detail (see attached)
Why bother with less than 2 courses of CMU? Pour the entire thing with concrete up to the underside of the slab on grade. Install dowels at mid-height of the existing footing. Adhere 1/2" polystyrene to the top of the existing footing that will be over-poured with concrete.
Ralph
Structures Consulting
Northeast USA