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Re: flag-pole

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Hello there!

Over turning Moment at the base is a very important factor in the stability analysis of a pole (be it a light pole or a flag pole); which infact determines the size of the footing to be used to give a Stabilising Moment, at least 1.5 times the Over turning Moment.

But remeber, the size of the pole (implying height & diameter or width) is important together with the size of flag or the luminaire.

If you provide me the size of the pole, I can let you know how to compute the Overturning moment at the base. This will help you determine the size of the footing. Regards,

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

From: Puebla Raul <rpuebla(--nospam--at)cee.gov.ec>
Reply-To: seaint(--nospam--at)seaint.org
To: seaint(--nospam--at)seaint.org
Subject: flag-pole
Date: Mon, 17 Sep 2001 13:59:08 -0500



Hi Everyone,

If anyone can help me.
What considerations  With Respect to wind pressure I need to make  for to
realize the analysis and design a flag pole of heigh 50 meters in steel .
with wind of 80 kph. The flag is 8x6 meters..

Thank you very much in advance,

Marino Puebla
Ecuador Sudamerica










-----Mensaje original-----
De: Ron Hill [mailto:ronhill(--nospam--at)hillce.com]
Enviado el: Lunes, 17 de Septiembre de 2001 12:49
Para: seaint(--nospam--at)seaint.org
Asunto: RE: Natural Frequency

For "flag-pole" type (first mode) I find the Modified Rayleigh Method as
noted in Biggs "Introduction to Structural Dynamic" is a good one. You load
the structure in the horizontal direction with the dead load and determine
the deflections.  You can use your general FEM program to calculate
deflections.


Ronald Hill, P.E.
HILL Consulting Engineering
Birmingham, Alabama  USA
Phone: 205.823.4784
FAX: 205.823.4145
Email: ronhill(--nospam--at)hillce.com
Efax: 509.275.8095
http:\\www.hillce.com

-----Original Message-----
From: Padmanabhan Rajendran [mailto:rakamaka(--nospam--at)yahoo.com]
Sent: Monday, September 17, 2001 12:29 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Natural Frequency


Anyone out there who can give me the formula for
natural frequency of a tapered cantilever member
(Larger end at the clamped edge)?
(1) self weight only
(2) with a concentrated load at the tip

Thanks.

Rajendran

P.S. I have derived it from first principles, using
the book by Clough & Penzien, but the math being
complicated, I want to check my results.

___



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