Drag coefficient of a flag pole 2

[caddone]

Hi,

I came across this link for the drag force.
[URL unfurl="true"]http://en.m.wikipedia.org/wiki/Drag_coefficient[/url]
Which one of these is applicable for a flag pole?

It's a taper pole dia 5in to 3in 15 ft tall.

Thanks
C1

 

[bridgebuster]

Go to this link

http://www.acmelingo.com/flagpoles/FP1001-07.pdf

The NAAMM flagpole spec was updated to be consistent with AASHTO regarding drag coefficients, based on wind speed.

 

[caddone]

That was a great link thanks.

But I am unable to apply this to accessories. So I need refer to the kind of chart I posted originally(wiki chart)

So my question is still open. The wiki link in my original post shows drag coefficient values. How do I appy this chart on accessories.

1. Say I have a pair of speakers fixed on extended arms.
Arms are steel 3 x 3 sq tubes 1 ft long.
Speakers are cylindrical. Dia 6 x 2 ft. Cylinders run parallel to pole.

2. There are 2 planter baskets. I guess they are shaped half sphere. Dia 2 ft . On 3 ft extended arm.

In the wiki chart, I am able see there is a semi sphere shape that I can refer for the planter basket. But I don't know which shape to refer for speakers. The cylindrical shapes are confusing on the chart?
Are the views Top views OR side views ?

 

[jmcoope3]

When you calculate the load on the segments you should add in the additional load from the attachments to that segment (ASCE 7-05 ch.6, it gets a bit hairy in 7-10, but most construction isn't up to that yet).

http://www.ce.udel.edu/courses/CIEG407/CIEG_407_Protected/Chapter 6 Wind Loads.pdf

I'd use the nonstructural wind loading calcs (qz) and treat it as an additional point load/moment at the point of attachment.

 

[JStephen]

I'm not sure how closely tabulated drag coefficients would correspond with the wind loading coefficients in the building codes. For example, if there is a considerable range of values for a particular situation, you'd expect a fluid dynamics book to show the average value. For a building code, you'd want it near the upper bound of possible values for that situation. There is also some variation of drag coefficient with Reynold's number, etc., so it would help if the tabulated values were derived from situations similar to your application.