Grade Beam @ Column
Grade Beam @ Column
(OP)
Situation: New addition next to existing construction. There are no documents for the existing building so we have no idea what the existing footing capacity is like. Therefore I am reluctant to place any new loads on the existing. I am proposing the attached detail, basically using a cantilever grade beam to pick up the new column. The new addition is on story so the load not really that high (max 5 kips). Do the seasoned folks here see anything in this detail that I am missing or any other avenues I should be exploring besides the grade beam? The downside of this detail is that the interior wall footing has to be at frost depth too to pick up the grade beam but since they are talking winter construction, so that might not be an issue at all.
Thank you.
Thank you.






RE: Grade Beam @ Column
The 2" gap, if you need it, should have compressible fill spec'd. You might not need it since, depending on sensitivity of the existing structure, you could develop the grade beam into the existing footing.
RE: Grade Beam @ Column
RE: Grade Beam @ Column
RE: Grade Beam @ Column
I figured as much about the dowels.
I have had to design a large number of pump handle grade beams lately with some of the cantilevers going out about 4 to 5 feet. Different jobs and different detailers.
I usually have addition bars on top at the cantilever and the detailers get it wrong every time. They put top bars on bottom and bottom bars on top. I had to go back and look at my details to make sure they were correct and they were.
best,
FP
RE: Grade Beam @ Column
RE: Grade Beam @ Column
RE: Grade Beam @ Column
Since it appears that you are not talking about a significant quantity of these, keep the T&B bars the same, hook the top ones as deep as possible or use headed bars. Provide good confinement steel around the longitudinal steel at the end of the cantilever. This will assure that you can develop longitudinal reinforcement as close as possible to the end.
I'm not sure why you would need to use an embed rather than anchor rods if proper confinement is provided. But I would want the flexibility of a baseplate, even if you use an embedded plate.
RE: Grade Beam @ Column