Bearing Wall on Existing Slab 1

[BadgerPE]

Hey all,

We are looking to add a mezzanine to an existing building. There are going to be offices below the mezzanine so walls will be used to carry the mezz loads to the slab. I have analyzed the slab capacity using Section 5.6 "Design for wall loading on slabs" in Ringo and Anderson and my slab has the appropriate capacity. However, there is no mention of reinforcement design. Can anyone point me in the right direction as to how to check that the present reinforcement is adequate for shear? I should note that the bearing walls are cold-formed so there is no bottom plate. Only a track.

Thanks Much!

 

[msquared48]

For shear, I would treat it as unreinforced, calculating the beam and punching shears accordingly, spreading out the load on 45 degree lines from the bottom of the track/header column.

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[Bagman2524]

Agree with MS^248. Shear in concrete is typically handled by stirrups which you don't have. There wall creates a punching shear in the slab which must be resisted by the concrete. The entire perimeter of the wall (with 45 deg cone) x slab depth is the area to be checked.

 

[BAretired]

Shouldn't that be m²48? Anyway I agree with you both.

BA