Stud Compromised?

[XR250]

I am building a house. In one area, I have 2x6 studs @ 16" O.C., 5'-6" tall. The plumber needed to drill a 4 1/2" hole thru the dead center of 3 studs (the hole is centered top to bottom). I figured I would reinforce them with angle iron later. However, when I run the numbers on the stud as is (1/2" material left on each side of the hole), I end up with a combined gravity and wind load stress of under 700 psi for the remaining portion of the stud. They are #2 SPF studs. Should I even worry about reinforcing them?

 

[phamENG]

XR - if you can wait an indeterminate amount of time for me to find the time to finally finish *cough* do *cough* my Master's thesis (assuming my other credits haven't expired, of course), I already have preliminary approval to study this very issue...though looking at holes bored in joists not studs, but same difference.

One issue I've found in my informal literature research is that very few people have really looked at this from a research/theoretical perspective. All of the code requirements have been around since the early 20th century (I think the earliest reference I've found so far that is identical to current code provisions was 1920s) with no real reference to hard data - just a "we've found this works well" sort of justification if anything.

Without any hard data to back it up, I would reinforce it. My limit is usually 1-1/2" to let rely on plywood reinforcing for a handful of joists. For this, I'd only let them bore this hole in a few studs - maybe 4 - and then I'd double the studs and add the reinforcing. That's just a judgement call - no data to back it up.

 

[XR250]

Thanks Pham

 

[Celt83]

the attached paper came from an older thread, it was either Agent666 or PhamEng that linked to it originally, but it has some good info in it for beam reinforcement. Link

My Personal Open Source Structural Applications:

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

Open Source Structural GitHub Group:

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

 

[dik]

Can you cobble one together from 18 or 20 ga material. You need right and left handed shears to cut the curve.

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

-Dik