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Type of Concrete and dept of pad

Type of Concrete and dept of pad

Type of Concrete and dept of pad

(OP)
I am trying to design a simple structure with one vertical pole about 15' high and attached @ a 45degree another 4' member, weighing 600#.  What forumlas should I use to calculate: the type of concrete and the dimensions of the support pad? Any help be great!  

RE: Type of Concrete and dept of pad

Well, first you need to choose type of foundation. You mentioned pad footing, but you may also consider pier foundation, considering the pole structure.  After that determine your vertical load, lateral load and moment.  Then determine soil bearing capacity. Now just open a reinforced concrete text and design the pier or square footing structurally given the bearing capacity and structural loadings.  Finally determine if the settlement is acceptable for the structure.

RE: Type of Concrete and dept of pad

SumMoments = 0
SumVertical Forces=0
SumHorizontal Forces = 0

RE: Type of Concrete and dept of pad

As simple as csd72 indicated. Good luck. Watch out for OT and twisting due to lateral load effect.

RE: Type of Concrete and dept of pad

What is the proposed use of this pole?  Describe the project in more detail.

 

RE: Type of Concrete and dept of pad

Looks like drilled pier would be a better choice than concrete pad.

RE: Type of Concrete and dept of pad

Kirkwood00007,

The design of this would take into account the following:

1.  Local wind and seismic forces.
2.  Soil conditions
3.  Frost considerations
4.  Area and configuration of the scanning panels (for wind)
5.  Other supplemental or possible loads in the future.

With the above, you'd have to do a wind/seismic analysis of the pole and size the footing/pier that supports it for the applied loads.

Also of concern is the connection of the pole to the base.  A type of moment connection is required here.

 

RE: Type of Concrete and dept of pad

(OP)
Thanks to all I have completed the design.

RE: Type of Concrete and dept of pad

What footing system is the final version? Sizes? Just curious.

RE: Type of Concrete and dept of pad

(OP)
I went with a pier foundation with 12" radius and 4' depth, because of the water level being so low in New Iberia.

RE: Type of Concrete and dept of pad

Good to know. Thanks, and good luck. Seems little too shallow for this conservative mind

RE: Type of Concrete and dept of pad

Good to know. Thanks, and good luck. Seems little too shallow for this conservative mind. But if you have done all cal with proper soil parameters, it should be good. Go back there at each season change (3-4 trips/year) to verify the assumption holds. That's what I would do.

 

RE: Type of Concrete and dept of pad

(OP)
Hear you, all I can do is make the reccomendation.  Sometimes operations rules, in this case they did.  My calculations had the depth set almost 1.5' deeper.   

RE: Type of Concrete and dept of pad

If "operations" is making the call what do they need you for?
 

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