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Aashto LTS 6 Lap-Joint formula

Aashto LTS 6 Lap-Joint formula

Aashto LTS 6 Lap-Joint formula

(OP)
In another post I had discussed about induction heat treatment for aluminum street light poles to retemper T0 - T6 at the HAZ. I learnt that this is not possible by localised induction heat treatment. We will have to use a huge oven to solution heat treat the entire pole which is an expensive setup & handling. This even more expensive when we dont have an inhouse heattreatment facility & have to be sent out.

Alternatively I am thinking of welding a cast base to a ~3ft taper pole. Now the the overall height of the weldment is not taller than 5ft. Which makes its easier to solution harden to T6. After heat treatment I want to lap-joint the tall pole to this short base. something like this :

I have seen some street light poles that have this kind Lap Joint connection & have a trough bolt & nut at the joint.

I have got this image by googling. But in aashto code, I don't see any formula for calculating minimum overlap.
Can any one see any drawback in this method?

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