Monopole - Wind Load

[whydoikeepasking]

Hi, I got couple questions dealing with a cantilevered monopole sitting on a footing, using ASCE7-10 wind load procedure.
What would be the wind force coefficient, Cf in this case? The pole has a tapered cross-section and is very slender (height to depth ratio of 35 to 60). Is it more like a free-standing wall or chimney/lattice tower? Some of the tabulated values are not available for this slender ratio.
Thanks

 

[CELinOttawa]

Poles are like slender chimneys.... I don't know your code, but I don't think any code can dispute that.

 

[a2mfk]

In the USA you should be referring to AASHTO Standard Specs for Structural Supports for Highway Signs, Luminaires, and Traffic signals. It will answer all of your questions and then some...

 

[msquared48]

Or TIA222-G if this is a cell tower monopole.

Mike McCann
MMC Engineering

 

[dcceecy]

check guide specification for design of metal flagpoles ANSI/NAAMM FP 1001-07 (still use ASD wind load though). it gives a good idea about the wind load for poles.

 

[racookpe1978]

The practical difference between a flagpole and a "ideal" round cylinder is very, very small: But, pick the one closest to your application.

The flag "load" at the top of a flagpole adds some reserve margin.