how serious is the effect of a wall footing situated on top of a footing?
how serious is the effect of a wall footing situated on top of a footing?
(OP)
in situations where the wall footing is on top of the spread footing, is it recommended that I neglect the effects of the wall footing in designing a spread footing? what are thoughts anyone? for two stories is it recommended?





RE: how serious is the effect of a wall footing situated on top of a footing?
RE: how serious is the effect of a wall footing situated on top of a footing?
You should include the self weight of the footing concrete when calculating your bearing pressure. Depending on the width of your footing you may want to design it for the bending it may see in the transverse direction.
RE: how serious is the effect of a wall footing situated on top of a footing?
Mike McCann
MMC Engineering
RE: how serious is the effect of a wall footing situated on top of a footing?
RE: how serious is the effect of a wall footing situated on top of a footing?
Is this correct?
If the column's spread footing is not on the same level as AND interlocked via rebar to the continuous footing, then you should NOT include the continuous footing capacity into the support of your column. They act independently and therefore will have differential settlement when loaded.
Even if you footing above is locked in somehow to the column pedestal (or other mechanism) then you still have the issue of lower settlement nullifying upper settlement.
SHORT ANSWER: Do NOT combine their capacities.
Althalus
RE: how serious is the effect of a wall footing situated on top of a footing?
For two stories, the loads will be relatively small; however, you need to know and understand the influence so that you can answer questions in the event of an issue later on that might get blamed on you, rightly or wrongly.