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Hi, By way of quick introduction... I'm a long time burner, and BIG fan of domes, who just discovered this tribe. I'm anxious to see what's going on here.
A few weeks ago we had a regional burn. After it ended, one participant left his dome standing, intending to take it down a few days later. Strong winds came in and rolled the 3V dome into a cigar. (I just posted photos to the tribe) It wasn't covered, so the wind load should be low, but it wasn't staked down either. Word is that wind speeds were 70+ mph. The dome was pretty darn heavy. You can see from the photo how far the wind rolled it.
I could imagine this happening to a covered dome (with larger wind surface) but am very surprised this happened to a bare steel dome. Has anyone else seen large domes fail?
A few weeks ago we had a regional burn. After it ended, one participant left his dome standing, intending to take it down a few days later. Strong winds came in and rolled the 3V dome into a cigar. (I just posted photos to the tribe) It wasn't covered, so the wind load should be low, but it wasn't staked down either. Word is that wind speeds were 70+ mph. The dome was pretty darn heavy. You can see from the photo how far the wind rolled it.
I could imagine this happening to a covered dome (with larger wind surface) but am very surprised this happened to a bare steel dome. Has anyone else seen large domes fail?
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Re: dome failure
Mon, June 19, 2006 - 4:45 PM--Interesting; sort of a shortcut to Zome design eh? ;-) I guess it's important to take compression loads, as well as tension loads into consideration when building these things. I suppose it might have been prevented either by staking it down, but an alternate method that springs to mind might be to hang a couple of heavy objects inside the structure...
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Re: dome failure
Tue, June 20, 2006 - 5:36 AMremember, the dome is essentially a hemisphere which relies on the ground plane for that part of it's integrety.
If it were well founded and securely staked it would probably still be standing.
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Re: dome failure
Tue, June 20, 2006 - 6:52 AMActually, i did see something like this last year at BM. An unstaked Dome withuot a cover getting rolled over by high winds. I'm not really sure about the physics of it, but apparently it's not a completely uncommon occurence. -
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Re: dome failure
Wed, June 21, 2006 - 1:57 AMI remember that rolling dome last year. it rolled from 700 to about 900 then stopped finally. It was a PVC dome I believe. What a sight....
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Re: dome failure
Sat, June 24, 2006 - 7:25 PMI remember there was a large dome of aluminum EMT tubing near the 9 O'Clock plaza that rolled early in the week (Monday, I think).
I recall being warned that using a heavy re-bar staple to anchor domes was necessary.
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Re: dome failure
Sun, June 25, 2006 - 6:00 PMyeah, this was the dome I was talking about. It flew about a hundred feet.
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Re: dome failure
Tue, July 4, 2006 - 9:46 AMI'm only surprised that there was no cover on it. Maybe there was and the wind finally shredded it off?
Geodesics encompass the largest amount of volume for it's mass in materials, so it's basically a big cup shaped sail waiting for the right wind.... Gotta anchor it. If it were a complete sphere, the wind would most likely cut around it, but it might roll a little.
Still, I don't think the dome failed. The builder did. -
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Re: dome failure
Tue, July 4, 2006 - 12:18 PMNo, the owner removed the cover. He intended to take the dome down a few days later. He assumed that the free standing, bare pipe dome would be ok in nearly any weather, so he wasn't in a hurry to take it down.
The dome was very heavy, so he didn't think there was a need to stake it down. In previous years he didn't have a problem with wind, even when the dome was covered and not staked down.
Also, it was fairly stoutly built. It supported a lot of weight while in use.
The wind rolled that thing up like a tortilla, and rolled it over a hundred yards along the desert. I would have never guessed that could happen. -
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Re: dome failure
Mon, July 31, 2006 - 1:00 AMI remember J. Baldwin, a contemporary and friend of Bucky's, a few years back in SF, saying that a dome (I don't know size or windspeed, but lets assume between 20' adn 40' in diameter, and 60+mph) was susceptible to uploads of ~40 tons. This is what scares me on the Playa, is that people are actually capturing that much energy (I'm sure that's what's got The Man and the ISS lookin' so closely @ The Playa, J/K). Just for fun, try looking for the ISS (International Space Station) with your naked eye, sometime around sunrise on Sunday of The Burn. It's rad, and The Playa is on their yearly flightplan, just like clock work. Any way..... The whole dome failure thing..... They aren't ever actually blown down, but sucked. The side that's facing the winds forces shears it to it's sides, and as the wind accellerates and reforms somewhere past the back end, a vacum is created on the backside of the winds impact. It's the side opposite the wind to really watch when it all comes crashing down. As far as the uncovered dome going down, yikes! That, I could have never taken a guess at. Live and Learn, except here, we only have to share our experiences, and distribute or null the grief of human mistakes. Thank God, we don't all have to learn each mistake. One per group suits us quite well.
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Re: dome failure
Fri, April 6, 2007 - 1:23 PMHi,
A late reply but it was not mentioned. Here is a link to the construction www.gregsfrontporch.com/HISTOR...nal.htm
And the failure
www.southpolestation.com/news/news.html
It does not mention the specific failure on this page but what I have heard is that the weight of snow sprung the bottom of the dome from it's concrete foundation and they could not figure out a way to fix it.