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RE: Pole Foundations
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- Subject: RE: Pole Foundations
- From: "Dennis Wish" <dennis.wish(--nospam--at)gte.net>
- Date: Sat, 8 Dec 2001 16:12:26 -0800
If you are an Excel user, there is a spreadsheet that will calculate the moment in the pole due to the wind applied to the sign area. It follows each of the steps in the basic logic that Syed indicates below with a couple of exceptions: 1. The spreadsheet allows for up to three signs to be placed on one pole. 2. The spreadsheet calculates the height of the signs above the base to determine the wind load applied. In other words, if the sign lies between two regions where the wind load changes then the area of that sign section is broken into two and the wind pressure is applied to each area above and below the line. 3. The wind on the pole is neglected in this spreadsheet. I suppose it can be argued that the pressure against the area of the pole is significant and it would be if the area of the sign is quite small. 4. The moment is calculated due to each sign segment so that the designer may change the pole section as the moment increases or decreases. 5. The pole and foundation is not designed in the spreadhsheet - this is left to another spreadsheet or one of the commercial programs such as Enercalc. However, if someone is ambitious and would like to improve the spreadsheet, you are welcome to do so. The spreadsheet is available on The Structuralist.Net Professional Discussion forum 'Cybrary' in the Spreadsheet Template forum. The Pole-sign spreadsheet is available along with nearly 20 other spreadsheets available for download at: http://www.structuralist.net/cgi-local/yabb/YaBB.cgi?board=Spread_Tplts Enjoy! Dennis S. Wish, PE California Professional Engineer Administrator - The Structuralist.Net Website: http://www.structuralist.net Professional Forum: http://www.structuralist.net/cgi-local/yabb/YaBB.cgi Public Forum on Housing: http://www.structuralist.net/cgi-local/yabb2/YaBB.cgi -----Original Message----- From: syed faiz ahmad [mailto:syedfaiz23(--nospam--at)hotmail.com] Sent: Saturday, December 08, 2001 12:26 PM To: seaint(--nospam--at)seaint.org Subject: Re: Pole Foundations 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 > ><< attach1 >> _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp ******* ****** ******* ******** ******* ******* ******* *** * Read list FAQ at: http://www.seaint.org/list_FAQ.asp * * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to: * * http://www.seaint.org/sealist1.asp * * Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. 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