Post load on slab
Post load on slab
(OP)
Im working a project where its desired to take out a load bearing stud wall (2x4) and put in a beam and posts to open up the wall. I am looking about about 2.2K DL and 5K LL on each post, supported on a baseplate 3.5"x6" (to keep within wall footprint thats remaining.
I have no info on the slab, other than thickness (6"). I checked punching shear and got about 65.3K which seems high to me. Anyone disagree with my number?
Also, as for cracking, what would you recommend doing?
Thanks
I have no info on the slab, other than thickness (6"). I checked punching shear and got about 65.3K which seems high to me. Anyone disagree with my number?
Also, as for cracking, what would you recommend doing?
Thanks






RE: Post load on slab
Any doubts - cut it out and pour a new footing!! Not that expensive and when you go to sell the property - everybody will be happy!!
RE: Post load on slab
Thanks
RE: Post load on slab
RE: Post load on slab
RE: Post load on slab
I saved it somewhere. I'll have to look tomorrow.
Or, you could sear the forum for it.
It basically showed that our normal approach to checking the slabs is overly conservative....but in case like yours where a new footing is so small and cheap, I'd just pour new.
RE: Post load on slab
RE: Post load on slab
@ toad, I searched, nothing came up, but of course I might be searching wrong.
@ Shobroco, bending is what I am concerned about. although the slab has been loaded for 30+ years, the soil should be good and consolidated, I am still worried about cracking. Shear looks ok, but long term its the cracks I dont want to be an issue. At the load magnitude I have, I dont see them been severe, so if they are going with carpet might be able to live with them. Its when they rip up the carpet and want exposed concrete or something. I assumed no reinforcing in the slab.
RE: Post load on slab
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RE: Post load on slab
Great article fancypants. I think I've both over- and under- designed this situation many times. Residential renovations seem to result in accepting the exisitng slab just for convenience, and industrial racking or mezzanine installations seem to result in a lot of concrete cutting just to CYA.