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Re: Masonry Foundation Supports
There is a big difference in capacity between masonry walls and masonry columns. You shouldn't use wall guidelines; the wall capacities assume there is distribution along the length of the wall; isolated columns can not distribute or share load like a wall.
The 80" height is based on the definition of a "pier" as being 5 times the length of the pier (16" x 5= 80"). However, it really depends on the load applied. If the pier is in a residence, typically light framed timber construction, a 16" x 16" x 6'-8" pier is most likely capable of carrying residential loads.
If its a foundation for any other use, the structural engineer should refer to ACI 530 part 3.2 for unreinforced masonry allowable compression loads.
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