Vulcarft 2 C Conform

[Lot2Learn]

A little confused about the three load tables they have for this non-composite deck.

1) Max construction load: I understand that, this is supposed to be with wet concrete.
2) Reinforced concrete allowable loads: I understand this one too, this is the capacity after concrete has cured.
3) Allowable uniform load: This is supposed to be the capacity the metal deck alone will carry. I don’t understand this table, why do I need it, I already have the above two for during construction and after construction capacities, why do I need to check this one?

Looking forward to some guidance from all the experienced folks here. Thanks,

 

[frv]

Remember that C is a non-composite deck.

The first table you mention is obvious- don't want "ponding" or failure of the deck when concrete is wet.

The second table is the capacity of the concrete slab alone- i.e. deck does not come into play.

You could have a case where you have a very lightly reinforced concrete slab (maybe just a wearing surface) and you want your structural capacity to be provided by the steel deck- there's your third table

 

[Lot2Learn]

frv-Thanks for the clarification.

 

[MiketheEngineer]

The third table can also be used for "man" loads. Don't forget to check the maximum span for "wet" concrete where shoring may be required.

We get 2 or 3 calls a year for an emergency shore when the EOR forgot to tell the contractor to shore the deck until the concrete has set. By the time we can get there - it is usually too late.

 

[Lot2Learn]

@ Mike:

Continuing on your explanation of table #3: Do you think that if its even a good idea to use a form deck like this alone to carry the load? Because a few months back I went for some balcony inspections, and the form deck under conc was just gone due to corrosion in most places. Or does this not fall under form decks?

Thanks

 

[MiketheEngineer]

Like all structural elements - they must be maintained. If that deck was designed as a composite structure - well it no longer fills that need.

Will it fall down. Maybe not - but if it really got loaded to the original design loads - it just might.