Flag Pole Footing - 180'
Flag Pole Footing - 180'
(OP)
I'm designing a 180' flag pole with a 40’x80’ flag. I used NAAMM's FP1001-07 but updated loads using ASCE 7-10. My question has to do with the footing and embedding the pole. The pole base is a 42" diameter steel pipe sitting in a 52" corrugated sleeve. The manufacturer/installer insists that the sleeve be filled with sand and that no grout is necessary. The footing itself is 6’ diameter and 19’ deep concrete. I’ve agreed to the sand but am insisting on 6” of non-shrink grout at the top so that the pipe has something to bear on and transfer the force to the footing at the top. Is there either a specification or standard somewhere that would shed some light on the grout/sand installation?






RE: Flag Pole Footing - 180'
http://www.eng-tips.com/viewthread.cfm?qid=32235
Separately, and claiming zero expertise, I wonder if the sand is intended to act as a semi-flexible anchorage that will yield a bit in uncommon storms, and not act as a stress raiser as the pole vibrates in any kind of wind.
If the pole someday suffers a brittle fracture at the top of your grout, will the pole manufacturer accept any responsibility?
Mike Halloran
Pembroke Pines, FL, USA
RE: Flag Pole Footing - 180'
There is one of the NAAMM manuals that describes the generic ground set pole with guidelines - including grounding and a seal at the top of the hole. Hope you have some decent ground.
I didn't know that ASCE 7-10 had a formula for the flag forces. Is your pole a tapered pole or a step-tapered pole?
Hope your installer isn't from Texas.
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
What is the installer's track record?
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: Flag Pole Footing - 180'
But we have seen instances of surprises when a ground-set pole shows up and the ground turns out to be rock. (or under water) (or just plain crap).
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
https://www.youtube.com/watch?v=uNtsny9-48M
Flagpole swaying:
https://www.youtube.com/watch?v=N9k7ajsCTJ4
Story on the pole, scroll down to the "Flag" link, I assume this is the one referenced in the "Texas" comment above, note that it has been replaced/reworked 3 or 4 times now:
http://en.wikipedia.org/wiki/Acuity_Insurance
I recall an inquiry coming in a several years back on the replacement of the 338' pole, as a fabrication-only job, all design was by others.
In regards to the original question, it seems to me that one obvious approach would be to inquire about previous flagpole installations of similar or larger size that used this same kind of construction.
I assume that the NAAMM standard is intended for generic flagpoles, and when you get into the "biggest flagpole in the world" type stuff, previous favorable experience on smaller poles might not be adequate.
RE: Flag Pole Footing - 180'
There are much higher flagpoles now in the world with more coming. The preliminary design of the Acuity flagpole was based on the AASHTO Standard Specification for Structural Supports for Highway Signs, Luminaries, and Traffic Signals, 6th edition for a F2 wind, -40 degree F temperature, 5" of ice and infinite fatigue criteria. The information in the NAAMM standard basically comes from the AASHTO code except for the flag loading. The NAAMM standard also provides a methodology for doing preliminary designs.
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
http://www.asce.org/cemagazine/Article.aspx?id=236...
RE: Flag Pole Footing - 180'
I meant to say that my first video was UNinformative, sorry about that, cool to see but doesn't tell you anything. Except that half the cost of that thing was probably moving the crane in!
RE: Flag Pole Footing - 180'
https://www.youtube.com/watch?v=0mBJtqg9LfA
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
RE: Flag Pole Footing - 180'
http://www.wceng-fea.com/vortex_shedding.pdf