elevated concrete garage slab on metal deck and I-beams DESIGN 1

[patrox777]

I have a design for an elevated slab to support a garage... it's on a steep grade so the front will tie into the standard driveway on grade....

I'm not worried about the perimeter steel beam loading or anything.. .just the 'vehicle load' on the deck... punching shear...

I have floor beams spaced at 3' centers.. with a .6c 26 gage vulcraft deck... with 5 inch slab and w 4x4 2.9 x 2.9 wire mesh.... 3,000 psi concrete

all of my calcs point to no problem what so ever- am i missing something?

thanks for any responses.

 

[ChipB]

In my own design under same circumstances:

I use #4 bars at 6" o.c. perpendicular to the steel beams, and #3 at 12" parallel to the beams in lieu of WWM. Reason being, they never get the mesh located properly.

I space my beams out a bit further (5 to 6 feet) and locate to match cells of the masonry wall.

I use Vulcraft 1.5 VLR deck so the flutes match my reinforcing spacing. The gage of deck is 22. This eliminates the need for weld washers when fastening the deck to the steel.

I ignore the deck's contribution in the design as, it has been my experience, it is not properly maintained by homeowners, and goes away eventually.

I call out for 5" minimum concrete.

Other people's designs?????

 

[patrox777]

Chip...

This is pat... I appreciate your response... this is a new one for me... i just spaced the beams at 3' o.c..... they span 10' and are w12x14's.... two bays....

think the mesh will work? to get the load to the beams?

 

[jheidt2543]

Boy, that seems like a lot of structural steel at a time when steel prices are pretty high! What are you using for dead loading and live loading? I would think a dead load of 61 psf (5" slab) and a live load of 50 psf would be adequate.

It seems to me that a 8" precast deck (Flexicore or Spancrete) with a 2" topping might be cheaper, but it would depend on where you are in the country and jobsite access.

Just a thought!