I have a relatively large (500'x400'x 25' tall) single-story building where the client is looking to put a 50'x50' penthouse structure on the roof. The penthouse will be fairly far away (more than 50') from any roof edge. I'm checking the existing building bracing for the increased wind loads...
Canam lists different values for no studs versus full studs (2010 was the latest catalog I could find).
https://www.canam-construction.com/wp-content/uploads/2014/11/canam-steel-deck.pdf
The difference can be somewhat significant. For instance, I was looking at 5.25” LW on 18 ga. 2” deck...
Most manufacturers list capacities for composite metal deck for “no” studs and “full” studs with interpolation allowed between the values. In the past I’ve used (perhaps conservatively in some cases) the no studs value even when studs are provided at the steel beams. My question is if the...
Thanks for the feedback. Wannabe - yes it is type b deck with insulation and membrane roofing above.
Ron - these anchors are installed in the bottom of the deck rib, so I believe the anchor head does not project above the top of the metal deck (keeping it below the insulation/membrane layer)...
Just a guess, but I think what hokie66 means is that a dashed line typically indicates something below the slab. Per your sections, the beam that is dashed is the one projecting up above the slab.
On a current project, we've gotten a request from the contractor to hang 1" diameter sprinkler piping directly from the metal roof deck using Sammy x-press anchors (expansion-style hanger installed from the bottom of the deck flute). We get these requests every so often on projects and usually...
A couple of things...by connecting into the columns at each side, you are assuming the wall will span horizontally (4.5 m), not vertically. To use the 3.5 m span, you would need to connect into the beam at the top and the foundation wall. This can be achieved by doweling into these elements...
Thanks all, very helpful information. BA - I hear you on deck depth, but with snow load increases in recent years here in the northeast, 1.5" deck doesn't fly for those spans. I'll contact Simpson and Vulcraft as Brad and KootK have suggested.
Sorry, should have been more clear...by stating "space the dowels a bit further apart", I meant moving them into the center of the block to tie into bond beams rather than the mortar joints as you have shown.
The wall definitely needs positive anchorage at the edges to resist wind load. Assuming the concrete columns are designed for the imparted wind loads, doweling to these seems like a fine approach. I would perhaps try to space the dowels a bit further apart and instead install in grouted bond...
Thanks Ron. For the first point, the 3" Type N deck has sufficient capacity to span 10'-0" based on the loads per Canam/Vulcraft, so 8'-0" doesn't seem like much of a problem. Maybe I wasn't clear enough on the type of decking we were proposing to use.
The second point is an interesting one...
We're working on a project that's just in schematic design and the architect wants to look at using glulam beams combined with a 3" metal roof deck (glulam spacing will be about 8'-0" on-center). The framing at the perimeter of the roof will be steel beams, not wood; i.e. the glulams are just...
I'm working on a project where we have designed some retrofits for existing roof joists to increase their capacity. In particular, we are proposing to weld a 5/8" rod to each top chord of the joists (which are a pair of 1.75"x2"x1/4" angles). The roof system consists of metal deck (supported...
Hi - new to this forum, but based on my experience with this site I'm hoping someone may be able to shed some light on this question for me.
I'm working on a project where we have designed some retrofits for existing roof joists to increase their capacity. In particular, we are proposing to...
Can you just allow the HSS section to "twist" - i.e. assume the end supports are pinned? It may greatly simplify the design. HSS sections generally twist very little under torsional loads, so the surrounding structure may not be that sensitive to it. Just a thought.
