books on building pole barns

[yooperdave]

Hi Soundguy,

I agree with your definition of a wood friction pile.

However, the friction on the pile is primarily generated from driving the pile usually many feet in the ground (depending upon the soil conditions) further than just the frost depth. The surface area of the pile in the ground multiplied by the depth and the coefficient of friction from the undisturbed virgin soil will dictate what capacity the friction pile will have.

Pole building manufacturers usually have a drill rig and will drill a hole in the ground just below the frost line so they can set a concrete pad below the pole. The load from the pole is taken out in end bearing and not friction. There might be a little friction but it is not accounted for in the structural design of pole buildings.

A pile driver along with the increased size of poles and depth of driving these poles would make the buildings too expensive for the average homeowner or farmer to afford.

Ask any pole building manufacturer of choice for a set of sealed structural calculations and my comments should be
more clear. The drilling of the large holes removed any hope for developing a usable quantity of skin friction in the virgin undisturbed soil.

We have a type of wood pile to support the building. However it is more of a end bearing pile and not a friction pile.

Pole buildings are cheap for a very good reason. Everything is cheap and simple with no geotechnical frills.

Regards,

Yooper Dave

 

[Soundguy]

Not disagreeing with anything here. Mostly our concerns are from uplifting forces. and high wind. Getting a good footer for a support piling is easy compared to making it stay in the ground during winds. In other words, down isn't the biggest problem for a friction pile, as it is easy to overcome with many footer options..... up on the other hand is a different story...
As far as pole barns go, we don't see to many people pile driving the wood supports.. just setting them with augers.

Some concrete.. most don't. Luckily we also live in a part of the country that doesn't really freeze.... just enought to annoy the plants, etc.

Soundguy

<font color=red>However, the friction on the pile is primarily generated from driving the pile usually many feet in the ground (depending upon the soil conditions) further than just the frost depth. <font color=green>The surface area of the pile in the ground multiplied by the depth and the coefficient of friction from the undisturbed virgin soil will dictate what capacity the friction pile will have.

<font color=black>The surface are of the pile will be directly proportional to the depth buried.

<font color=red>Pole building manufacturers usually have a drill rig and will drill a hole in the ground just below the frost line so they can set a concrete pad below the pole. The load from the pole is taken out in end bearing and not friction. There might be a little friction but it is not accounted for in the structural design of pole buildings.

 

[Mosey]

In case anyone is interested, there is a related post in the Off Topic and Just for Fun forum:

<A target="_blank" HREF=http://www.tractorbynet.com/cgi-bin/compact/showflat.pl?Cat=&Board=off&Number=184991&page=0&view=collapsed&sb=5&o=0&fpart=>Concrete & Treated Posts Debate</A>