Composite Metal Deck (Fastening)

[palk7 EIT]

Hi,

To consider as a composite deck slab (1.5"x18GA. metal deck with Normal weight concrete topping, total slab depth = 4.5") and use the composite deck slab load table to determine the allowable superimposed loads.

The connection of the metal deck to the supporting beam underneath, should it be traditional headed studs, or is it ok to have Hilti Powder actuated fasteners as the connection system and still consider the deck to be a composite deck?

Thank you

 

[JAE]

The manufactured ripples in the deck itself make it a "composite deck" with the concrete placed on top. This is for composite action of the deck-slab spanning between the beams.

The headed studs provide a mechanism to create a composite deck system - making the beams and deck act compositely - for the beam spans.

Two different things.

Little power driven fasteners don't do anything for the beam-slab system.

 

[palk7 EIT]

Thank you JAE, for the connection between the metal deck to the supporting beam is it ok to consider the Headed studs welded as the attachment and get rid of the powder actuated fasteners ? This makes the beam and deck to act compositely as well

 

[GeorgeTheCivilEngineer]

If there are welded studs then the fasteners aren't needed.

However there are some advantages to fix the deck in place for construction and safety reasons - but that would fall to the Contractor to consider and decide on, and shouldn't make any structural difference given the eventual presence of the welded headed studs.

It is fairly common to have composite deck on a non-composite beam, with the deck affixed using fasteners. If properly specified, the fasteners can provide lateral restraint to the non-composite beam to give full plastic capacity.

 

[JAE]

Agree with GeorgeTheCivil.