Wood stairs moment connection
Wood stairs moment connection
(OP)
Hello everyone,
This is my first post on this forum, however, I've been reading threads for quite some time. Thank you for all your help!
I have a question about a moment connection in a wood frame. Attached to this post is a sketch with an issue I'm dealing with. Could you please look at the sketch and tell me what do you think I should use to carry a moment at the stringer/joist connection? In addition to that, is there any way to reduce the deflection other than more material (sistering a stringer)? I have never designed a moment connection in wood so any help would be appreciated.
2x12 SPF#2
Thank you,
This is my first post on this forum, however, I've been reading threads for quite some time. Thank you for all your help!
I have a question about a moment connection in a wood frame. Attached to this post is a sketch with an issue I'm dealing with. Could you please look at the sketch and tell me what do you think I should use to carry a moment at the stringer/joist connection? In addition to that, is there any way to reduce the deflection other than more material (sistering a stringer)? I have never designed a moment connection in wood so any help would be appreciated.
2x12 SPF#2
Thank you,






RE: Wood stairs moment connection
RE: Wood stairs moment connection
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Wood stairs moment connection
Floor plan of the stair area is attached. There is nothing on the "left" site of stairs. There is a wall on the right side.
Thanks
RE: Wood stairs moment connection
RE: Wood stairs moment connection
RE: Wood stairs moment connection
RE: Wood stairs moment connection
RE: Wood stairs moment connection
There's one version of this I might be able to get behind:
- bottom of the stringer fixed against lateral translation.
- top of the landing joists fixed against lateral translation at end opposite the faux moment connection.
- just enough of a bullshit moment connection that you can call the thing rigid body stable-ish.
Toss that out to your architect before the calcs show up to ensure that these other guys don't look sharper than you. "Here's one, somewhat questionable, approach...".
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Wood stairs moment connection
BA
RE: Wood stairs moment connection
Make the stringers out of plywood layers (with multiple 8 ft sections in the middle 8 feet).
This might not work well due to the relatively shallow section available at the tread/riser zones.
Use steel flitches for the stringers.
You might be able to use a channel or tube section placed at the edge (as a way to avoid making 4 or 5 flitches) and then frame the landing off of the flitch.
I like BA's suggestion too. The whole thing doesn't seem so big that it can't be managed with wood and well positioned anchorage.
Steve
RE: Wood stairs moment connection
With too many Archs. these days, nothing is impossible or too expensive when it comes to the edifice they are building to show their design talents; that is, as long as it is someone else’s responsibility to make it work without any problems and as long as they can blame that other party for the ridiculous extra costs and efforts involved in their perfect design. To often, they have no idea why it won’t work or isn’t a good idea, and they don’t seem to give a damn. They (or CAD) can draw it, so it must work. I would design cranked steel stringers spanning from the lower floor, up the steps plane to landing plane change and on to the LVL. Make the bot. flg. about 4" wide and centered on the web. Make the web shallow enough so as to miss/clear the tread/riser cuts on the 2x12's at the steps. Make the top flg. one sided, and thicker, like a channel flg. Have the fab’er. weld some threaded studs on the opp. side of the web (away from the top flg.) to fix the sistered 2x12 stringer framing to the steel. The wood stringers bear on the bot. stl. flg., with the bolts sistering them Install some wood blocking for stability. This is all done for Arch. sex appeal, at great expense. A few 4x4 posts with invisible paint would work better.
RE: Wood stairs moment connection
We asked for calcs for this stair 'z' wood stringer and never received any.
RE: Wood stairs moment connection
RE: Wood stairs moment connection
RE: Wood stairs moment connection
Maybe there's a "yardarm" on there holding things up.
I've done similar things before.