Timber strength perp to grain

[mmoott]

Hello all,
I have what I think is a very basic engineering query, would be great if any of you can help me out.
I need to lift some oak columns by a 16mm diameter pin. I want to work out whether the oak above the pin has the strength to carry the column when it is lifted. See attached diagram for details.
Any advice or explanations very welcome.

 

[phamENG]

No diagram. Most wood codes have provisions for connections - that's where I'd look.

 

[XR250]

What is the distance from the end of the member to the pin? How thick is the tenon?

 

[jayrod12]

I've rarely seen the guys lift by the dowel holes. They usually wrap a cinch strap around the column. I've watched a lot of Timber Kings and have never seen them lift anything any other way.

 

[MotorCity]

What your diagram shows is the load being applied parallel to the grain, not perpendicular to the grain (which is not allowed). Do you have any specific questions about checking this connection? I think its certainly feasible but I'd be more inclined to put the pin through the post section rather than the tenon ( or use another method that does not use a lifting pin at all).

 

[mmoott]

 

[mmoott]

Yes, parallel to the grain! not perpendicular
Unfortunately we cant strap the post because it will be wrapped in plastic for protection, too slippery for the strop to hold.
We cant put the bolt through the post either since it will all be visible and the clients do not want to see plugged holes. Hence we're trying something a bit unconventional

 

[XR250]

perhaps remove the plastic where the strap fastens

 

[jayrod12]

Based on the information provided, a single 16mm pin with those edge distances in "weak" lumber would be good for about 5 kN. But there's not a lot of redundancy there, and if you damage the hole, there isn't really a good way to repair it. So I'd be more inclined to do as XR indicates.

 

[mmoott]

Thanks all for the advice, first time posting here and it was really helpful

 

[Tomfh]

How heavy is the column?

This looks feasible. Be mindful that lifting operations should have much higher factors of safety than regular members, to account for dynamics effects, bumps, general mishandling.