- Joined
- Jun 2, 2019
New construction typically continues on top of curing concrete with less time than that. People are crawling all over everything, but that’s nowhere near design level service loads in traditional construction.A foundation slab that had, optimistically speaking, a week to cure can be called many things, but not solid.
This has been posted before, but for reference here’s a link to the prefabs they seem to be using, or at least something very similar:
Source ready made cottage modular hotel construction on m.alibaba.com
ready made cottage modular hotel construction, You can get more details about modular hotel construction, cottage, ready made cottage from mobile site on m.alibaba.com
It’s worth a read for the product descriptions alone. I can tell you right away that similar light gage steel construction is relatively common in the US. Single units of this should be fairly stable, if on the edge of safety.
The floors are slightly raised to allow room for plumbing/electric, which is good. It’s not a ton of space, but it mitigates the need for cutting through joists to run conduit (although this is certainly still happening; cutting through load bearing members is basically the official international language of contractors).
What I’m skeptical of, aside from some of the other hilariously worded claims, is the purported ability for these units to be stacked. The company says up to 3 units high, so far I’ve only seen 2 high in pictures of the temporary hospitals.
Additionally, I have not seen any lateral force resisting system to speak of. The method with thin gage construction is typically cross-braced steel straps, which themselves are easy to hide but I haven’t seen evidence that they’ve given any real consideration for connection design. A single unit is likely not going fold in on itself, but once you start stacking high and deep, you’ve got to start tying things together to create a load path to the foundation. Wind uplift is likely going to be the controlling failure state.
When I have a little more time this morning I’ll do a quick analysis to get an idea as to what kind of load these units can take.
The TLDR is that these things are probably unsafe, especially for hospital live loads, but it’s not immediately apparent that they’re blatantly unsafe, without digging a little deeper into the math.
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