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# Re: Pole Foundations

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Pole Foundations
• From: "syed faiz ahmad" <syedfaiz23(--nospam--at)hotmail.com>
• Date: Sat, 08 Dec 2001 23:25:36 +0300

```Randy,

You have to do it by first principle; its simple.

For such a height wind will govern. You have to proceed as follows:

-  establish wind pressure; use ASCE manual
for the purpose.

-  from the given geometry of the luminaire,
establish C.G of the luminaire; for all
practical purposes the center of the
luminaire should be its C.G.(CENTER OF
GRAVITY).

-  establish the C.G of the light pole
itself; use simple mathematics to do
that.

-  the next step is to determine the
surface area of the luminaire & the
light poles;that is the surface exposed to the
wind.

-  apply the wind pressure to the surface
areas to establish the wind loads.

- apply these wind loads to the C.G of both
the luminaire & the light poles; multiply
the wind load with the lever arm to
determine the wind moments at the base of
the pole.

- after determining the wind moments, make
stability checks; that is checks to
satisfy:

-  stability against overturning
-  stability against sliding

- the contributions for the stabilising
moments would come from:

-  dead weight of the footing
-  soil overburden weight
-  passive resistance from the soil.

- the size of the footing should however be
first established through vertical
reactions divided by the bearing capacity;
however, the size would ultimately have
to be such as to satisfy the stability
requirements.

Hope that helps. Regards,

SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD

```
```From: Randy Diviney <rsdiviney(--nospam--at)hayeslarge.com>
To: seaint(--nospam--at)seaint.org
Subject: Pole Foundations
Date: Tue, 04 Dec 2001 15:27:54 -0500

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