Deck Edge Angle 3

[Samwise Gamgee]

I have a 3" metal deck on roof. For the closure of the deck, I was planning on using an angle like shown in the picture. I have a couple of questions

[ul]
[li]Is it safe to say that the deck angle only acts as a chord member[/li]
[li]How do I design the weld between the edge angle and the deck ? I have seen it shown as 1/4" fillet weld at 3-12. I am assuming that means 3" per every 12" . What determines if this is adequate ? [/li]
[/ul]

 

[dik]

How do they get applied as discreet values. I would have thought the diaphragm was rigid enough that they would be a 'fixed' value across.

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]

@dik , what forces are you referring to ? Collector forces or chord forces ?

 

[phamENG]

I will never have factored wind and factored dead load at the same time.

I'm fairly certain ASCE7 and the IBC disagree with you, unless I'm misunderstanding your meaning.

4. 1.2D+1.0W+L+0.5(L_r or S or R)

1.2(D+F)+1.0W+f₁L+1.6H+0.5(L_r or S or R)

 

[Samwise Gamgee]

phamENG , I meant to say that I will never have 1.4D and 1.0W at the same time. Sorry I didn't state that clearly.

 

[bones206]

If you are going to have a welder up there for the beam connections, might as well have them do field splices to make the bent plate continuous as well. Many ways to detail that, but might be easiest for you to just call it out as continuous and see what the detailer comes up with for a detail on the shop drawings.

 

[Samwise Gamgee]

Bones, the tricky part is the deck edge is only 4" and it gets interrupted by HSS 8x8 columns at every bay as I showed in the picture. One way to make the angle continuous is to weld a plate between the angle on either side of the column. But again , the plate would be unbraced for those 8" and it cannot take much compressive load.

 

[bones206]

This is a roof correct? Wouldn't the column stop at the top of steel elevation, with the edge angle set on top?