Bearing area for base plate with grout
Bearing area for base plate with grout
(OP)
I have a 17" square baseplate sitting on a 7' square spread footing with 2" grout. When checking the bearing of the concrete, is the bearing area "A2" the area of the baseplate or is it (17" + 2*2")*(17" + 2*2") assuming the grout spreads out at a 45 degree angle on all sides? Or is it the smaller of the footing area, which is limited by 1.7*f'c*A1 where "A1" is the area of the base plate.






RE: Bearing area for base plate with grout
1) Bearing stress on the footing based on an area equal to the area of the grout that is in contact with the footing. for this check you can increase the bearing stress for confinement.
2) Bearing stress on the top of the grout base. This is the one that always makes me wonder. If I'm confident that the grout base will spread out at 45 degrees, can you increase bearing based on confinement? I usually don't because a) I don't trust the construction quality and b) generally the grout is of a high enough strength that it doesn't matter anyhow.
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Bearing area for base plate with grout
RE: Bearing area for base plate with grout
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Bearing area for base plate with grout
RE: Bearing area for base plate with grout
RE: Bearing area for base plate with grout