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Re: Pole Foundations

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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,

SYED FAIZ AHMAD; MENGG, MASCE
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA.



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

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