## Foundation for Sign Pole

## Foundation for Sign Pole

(OP)

Hello,

i m designing a foundation for a sign pole(drilled shaft). i found the embedment length. anyone know which formula to use to calcs the necessary reinforcement.

i looked at some old design, they use # 5 Vertical with # 4 @ 12" without any clacs

anyone with some reference on how to design sign foundation.

thank you

i m designing a foundation for a sign pole(drilled shaft). i found the embedment length. anyone know which formula to use to calcs the necessary reinforcement.

i looked at some old design, they use # 5 Vertical with # 4 @ 12" without any clacs

anyone with some reference on how to design sign foundation.

thank you

## RE: Foundation for Sign Pole

Are you dropping the sign post in the hole and then pouring concrete around it? Then you don't need much more than some rolled WWR to keep it from cracking apart.

## RE: Foundation for Sign Pole

what the reason of calculating pressure at 1/3 of depth?

## RE: Foundation for Sign Pole

## RE: Foundation for Sign Pole

## RE: Foundation for Sign Pole

There's several of those, from AASHTO (sign structure spec & bridge design spec), ACI, and others.

Rod Smith, P.E., The artist formerly known as HotRod10

## RE: Foundation for Sign Pole

trying to figure out, how to design it.

## RE: Foundation for Sign Pole

## RE: Foundation for Sign Pole

I am puzzled. Usually one would need to calculate soil pressures to determine embedment depth, ...

## RE: Foundation for Sign Pole

i was looking at some calcs and they present final result show pressure at 1/3 of the depth.

this why i ask?

i m just trying to grasp the design of sign pole foundation

## RE: Foundation for Sign Pole

## RE: Foundation for Sign Pole

I'm not sure what example you're using for the 1/3 of the depth, but I can tell you that for a pole foundation, the maximum moment will occur somewhat below the soil embedment level. From my experience, a depth of 1/3 of the required embedment depth would generally be a decent approximation for the location of the maximum moment. The magnitude of the maximum moment could be roughly approximated assuming it to be unrestrained above that point.

Rod Smith, P.E., The artist formerly known as HotRod10

## RE: Foundation for Sign Pole

## RE: Foundation for Sign Pole

I haven't really used Brom's method, so I don't really have a feel for how it compares to the more detailed methods. I'll leave that to those more familiar with it.

Rod Smith, P.E., The artist formerly known as HotRod10

## RE: Foundation for Sign Pole

We try hard and have a bunch of experience. However, your primary resource should be your supervisor and colleagues.

## RE: Foundation for Sign Pole

## RE: Foundation for Sign Pole

Rod, can you please give some reference about more detailed methods.

i couldnt access your file dik.

thank you guys

## RE: Foundation for Sign Pole

https://en.smath.com/view/SMathStudio/summary

Dik

## RE: Foundation for Sign Pole

## RE: Foundation for Sign Pole

Rod Smith, P.E., The artist formerly known as HotRod10

## RE: Foundation for Sign Pole

jdonvilleon this one. This thread is getting scary. This thread should not be the main (only?) reference for learning how to design this sign foundation. Time forAbdel22to hire, or find in his or her office experienced engineers - one for the soils, pressures, deflections, etc. and one for the concrete shaft design.www.PeirceEngineering.com