Uplift Connection Procedure

[aka83]

hello all, im looking for a detailed procedure for the uplift connection detail for a timber pile, design and construction procedure would be very helpful. thanks

 

[Qshake]

How about bolting a steel pipe collar at the top that has rebar welded to the side? The rebar can be hooked 180 at the top to provide the development length and anchorage necessary.



Regards,
Qshake

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[Ron]

Similar, use flat bars, lag bolted or thru-bolted into side of pile, extending above with holes through which rebar are passed to develop connection.

 

[aka83]

both the methods looks like i can work with, but how do i determine the top of pile to bolt dim, hook dim and rebar size?

 

[hokie66]

That depends on the uplift load. Knowing the loading, apply your wood and concrete codes.

 

[Qshake]

As hokie66 notes this detail is all about codes. The development length of a rebar hooked 180 degrees into concrete will provide a connection that will develop the strength of the bar. So you can calculate the tension load resisted for the total rebar that way.

The bolt location and number is similar to the above. Determine the minimum edge distances for what bolts you want to use and then determine if the bolts will shear off or crush the wood. The smaller of the two governs and with that you can determine how many bolts to use and then find the total resistance of that part of the connection.

Next compare the rebar total to the bolt/collar total and see which will govern. Alternately it's likely the rebar will be high so you can set your total bolt force to that and determine how many bolts to use.

Regards,
Qshake

Eng-Tips Forums:Real Solutions for Real Problems Really Quick.