Column landing on slab courtyard
Column landing on slab courtyard
(OP)
Ok, I hope I can explain this very well.
So lets say I have basement foundation wall, lets say the top of footing is at 90ft elevation. The main floor is at 100 ft. The courtyard is only 6" below the main floor and its all covered with 4" slab + stone veneer.
Lets say I have a column from a deck that lands on the courtyard. This column is only 3 ft away from the basement wall. Can I just stop this column at the courtyard level and maybe thickened the slab around the column? (It will be sitting on fill material)
OR do I need to go extra few feet for frost depth?
OR do I need to use sonatube all the way to the native material probably around 90ft elevation because it is so close to the basement foundation wall.
So lets say I have basement foundation wall, lets say the top of footing is at 90ft elevation. The main floor is at 100 ft. The courtyard is only 6" below the main floor and its all covered with 4" slab + stone veneer.
Lets say I have a column from a deck that lands on the courtyard. This column is only 3 ft away from the basement wall. Can I just stop this column at the courtyard level and maybe thickened the slab around the column? (It will be sitting on fill material)
OR do I need to go extra few feet for frost depth?
OR do I need to use sonatube all the way to the native material probably around 90ft elevation because it is so close to the basement foundation wall.






RE: Column landing on slab courtyard
As far as the load goes, you can figure the additional load on the wall and superimpose that with the regular basement load in your analysis. Das goes over at least one procedure to do this, either in Foundation Engineering or Principles of Geotechnical Engineering, I don't remember which.
RE: Column landing on slab courtyard
RE: Column landing on slab courtyard
Or if you just want to go to frost level with the footing, the existing wall needs to be checked for the new load from the new footing.
RE: Column landing on slab courtyard
Older Bowles texts have these conditions shown and the applicable equations you can use to calculate the additional load on the basement wall system.
Sperling's suggestion is correct if you do not want the post load to impact the design of the basement wall.
RE: Column landing on slab courtyard
RE: Column landing on slab courtyard
If you are going to place the footing in the fill, a three foot square footing with it's centerline 3'-0" away from the wall should be placed around 91'-6".
Talk this over with your supervisor. There are always other factors specific to your project that will not be considered by persons answering questions.