Tilt up T.I. mezzanine attachment

[carsonwjohnson]

I'm just looking for info on what other engineers in the industry are doing for projects like this. I have an existing 6" tilt up in which my client wants to build a mezzanine, and I'm going back and forth between ledgering on to the existing wall, or wood framing a wall inside. My fear is that the movement of the existing structure will cause excess stress to the new wood structure if I use the ledger design, but on the other hand, it would be nice to use the shear properties of the concrete walls. Any input would be greatly appreciated.

 

[HermanLJ]

Get design calcs and plans for the existing structure. Check deflections (especially from wind load) then design from there.

Timber is pretty flexible though and most small single storey r.c. structures wont deflect more than 10mm so you should be fine.

 

[BAretired]

Probably could be done either way. If you use separate wood framed walls, what would they bear on?

What does T.I. mean?

BA

 

[HermanLJ]

Just to expand on what I meant by "Check deflections (especially from wind load) then design from there": I would put in fixed supports in my analysis model of the r.c. structure where the timber structure would attach the the existing. That will give you reaction forces which you can use to design the mezzanine.

 

[JoshPlumSE]

Just thinking about strain compatibility here. If the wood wall and tilt-up wall are connected then the STIFFER element (i.e. the tilt-up wall) is likely to take additional load. So, I wouldn't tend to be worried about the wood wall getting damaged. Quite the opposite actually, I would worry about how much additional load the mezzanine + wood wall imparts on the tilt-up wall.

 

[ztengguy]

the tilt up wall would be ok usually, it would cut the unbraced length down of the wall.

 

[Qrs]

BA: T.I. = Tenant Improvement

 

[msquared48]

I would be careful here if you are in a high seismic area as the lateral from seismic will probably control over wind.

If you attach the mezzanine to the tilt-up structure, you will have to run an updated seismic for the entire building, and it will probably fail. You will not want to go there. The best course would be to make the mezzanine its own separate structure with shear walls or frames.

Mike McCann
MMC Engineering

 

[BAretired]

Thanks Qrs, I wouldn't have guessed "Tenant Improvement" in a million years.

BA