Drilled holes in 2x8 joists near end of span

[CANeng11]

Just wondering how others look at situations like this attached picture.

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The electrician notched two holes, for some reason, a few inches from the end of the floor joists span. These are 2x8 joists spanning about 11'6". Would you take the net section remaining above and below the holes to determine a remaining shear capacity of the joists? Or could you look at it like a notch and assume the bottom of the joist is completely removed? If you find there is enought remaining shear capacity with these joists, would you say no improvements are needed?

 

[XR250]

I would not worry about it. It is unlikely that shear will control this situation.

 

[dauwerda]

As long as it is within the notching and drilling requirements of the IBC I wouldn't analyze it at all.

https://codes.iccsafe.org/content/IBC2018P4/chapter-23-wood#IBC2018P4_Ch23_Sec2308.4.2.4

The design capacities of wood account for things like knot holes - a hole drilled for electrical wire won't be much different than a knot hole would be.

*edit* I see you are in Canada, but I would assume your building code also has something similar to what the IBC has for notching and drilling of joists.

 

[CANeng11]

The National Building Code of Canada has something similar: "Holes drilled in roof, floor or ceiling framing members shall be not larger than one-quarter the depth of the member and shall be located not less than 50 mm from the edges, unless the depth of the member is increased by the size of the hole."

Is the 50mm to the center of the hole of the edge?

 

[LittleInch]

Not drilling it in the centre is poor practice and two close together worse as is drilling it that close to the end. Building regs / codes should give you the allowable based on your locale and region.

shouldn't be that hard to find out what is allowable, e.g.

https://www.labc.co.uk/news/how-get-it-right-notches-holes-solid-timber-joists

"The electrician notched two holes, for some reason,..." That's because he's an electrician who doesn't even give a scintilla of thought about drilling holes anywhere he wants when no one is looking.

Charge him for destroying your beams and replacing them and then he might not ever do it again without asking.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[skeletron]

I see this a lot in existing buildings.
The holes are specified somewhere in O86 or NBCC. Usually the middle 1/3 of the member, and a reasonably small hole are acceptable. If you are really worried about it, you can get them to strap it with those little Simpson metal straps along the bottom edge. I would look at the shear capacity of the net section to ballpark whether or not to lose sleep.

 

[Dvdt18]

See attached. May be helpful but also for Timber Construction. Can be found here

https://aitc-glulam.org/index.php/technical-notes/

 

[dik]

for glued laminated wood.

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