Deck supported on three sides ?

[Samwise Gamgee]

I have a unique condition where the deck can only be supported on three sides . On the fourth side, the deck is only connected at the locations where the infill beams are (See the screenshot below).

The fourth side has stud wall sitting on it. Should I have additional beams to fill the fourth side ?

 

[rb1957]

how much will the edge deflect ?

if it's easy, why not put in edge members ?

another day in paradise, or is paradise one day closer ?

 

[Celt83]

continuous deck edge angle sized for diaphragm chord forces plus nominal loading from the assumed one-way deck.

My Personal Open Source Structural Applications:

https://github.com/buddyd16/Structural-Engineering

Open Source Structural GitHub Group:

https://github.com/open-struct-engineer

 

[dik]

Do you need the diaphragm for lateral (add an angle)? If not, then just a normal deck closure strip and screw the CFS stud wall track to it.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Samwise Gamgee]

The deck doesn't need to be a diaphragm for lateral system. I will just add a deck closure angle.

 

[dik]

That's the way to do it... and use screw type fasteners.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[JoshPlumSE]

Can I assume we're talking about vertical deflections?

If so, most of the time w pretend that decking is one-way and that the Deflection is based on a unit width, the loading and a simply supported beam with the span length shown.

This isn't technically true, but it is conservative. In reality, continuity across supports will decrease the deflection by a good amount. So will two-way bending.

 

[Celt83]

The deck doesn't need to be a diaphragm for lateral system.

You sure? Looks like a stepped down roof, how do you envision lateral load path through this region?

My Personal Open Source Structural Applications:

https://github.com/buddyd16/Structural-Engineering

Open Source Structural GitHub Group:

https://github.com/open-struct-engineer

 

[dik]

I generally consider walls to be more stiff than deck.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Samwise Gamgee]

The only lateral load on the canopy area is due to the wind load on the surface of the canopy which isn't much. The lateral load into the columns will be an internal moment in the column and the column has enough capacity to resist it.

 

[MotorCity]

Before we even discuss diaphragms and deflections, the first basic question is whether the deck spans 1 way or two way.
If it spans one way, is it spanning the correct direction or does it need the fourth member to support the span in that direction?

If it is spanning two ways, is that even possible? What material is this deck? Plywood? Concrete?

Is it intended to be a continuous span? 4 Single spans?

How is it loaded? Are there heavy concentrated loads near the middle of the unsupported edge???