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Re: Hurricanes/wind/and round homes
Old 06-15-2006, 08:18 AM   #21
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Re: Hurricanes/wind/and round homes

In the May issue of Concrete Monthly (good readin'!) it has a article about debris.

"Debris driven by high winds presents the greatest hazard to homeowners and their homes during tornados. [even though we're talking about hurricanes]*Laboratory testing at the Wind Energy Research Center at Texas Tech University in Lubbock, Texas compared the impact resistance of residential concrete wall construction to conventionally framed walls. *The frame walls failed to stop the penetration of airborne hazards. *The concrete walls successfully demonstrated the strength and mass to resist the impact of 100 mph wind-driven debris."

... gives some reference for windspeed, 100 mph is 100 mph, I guess.* Even though hurricanes and tornados both develop higher windspeeds.

-CC
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Re: Hurricanes/wind/and round homes
Old 06-15-2006, 08:38 AM   #22
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Re: Hurricanes/wind/and round homes

bbuzzard

According to a N.C. modular builder (Deltec). There homes can withstand greater
force since they have no single flat section wider than eight feet. " this minimizes
large areas where wind can build and create pressure, which would collapse a
conventional square or rectangular home. The circular design insures any force exerted against one side of the structure is distributed out the opposing side."
So, (if true) it may be possible to build a conventional home that could hold up
as well but would it be cost affective? They also claim to have a one of a kind
roof system with optimal pitch to equalize any downward pressure or uplift.
What do you think?
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Re: Hurricanes/wind/and round homes
Old 06-15-2006, 11:33 AM   #23
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Re: Hurricanes/wind/and round homes

Discovery Channel (or one of its clones) did a story on hurricanes and showed a house that was shaped something like a ship (a pointed "bow" facing the beach). Blow out lower level, massive concrete pillars all the way up through the structure, etc. But that was right on the water, a bit of overkill if you're farther inland.

If you're building outside the surge zone what I've read is that you have two concerns - both caused by wind - debris penetrating through windows (and even walls) and structural failure if the envelope of the building is compromised. The latter usually occurs when the roof goes as winds push up along the edges and too many roofs don't have hurricane straps/bracing (hip roofs seem to be somewhat resistant because there is no lip for winds to go under and push up against). But, if you lose a window from flying debris it would be much the same problem. The wind is no longer pushing on and around the house, but now is going inside.

Once the wind finds its way inside the house it is only a matter of time before the structure starts to come apart as the wind tries to find its way back out.
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Re: Hurricanes/wind/and round homes
Old 06-15-2006, 11:46 AM   #24
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Re: Hurricanes/wind/and round homes

Heh heh heh

The tree's - the stinking trees. Wonderful shade for years - then da hurricane.

Know two friends - well inland but the old trees bopped the house.

heh heh heh - if it ain't one thing it's another. BTY - I grew up at the foot of Mt ST. Helens. Mainly worried flash flooding in those days. Volcano - who'd have thunk it.
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Re: Hurricanes/wind/and round homes
Old 06-15-2006, 12:06 PM   #25
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Re: Hurricanes/wind/and round homes

Quote:
Originally Posted by mathjak107
i have a 5 sided hexagonal shaped tent...
Is that cheaper or more expensive than a six-sided pentagon?
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Re: Hurricanes/wind/and round homes
Old 06-15-2006, 04:09 PM   #26
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Re: Hurricanes/wind/and round homes

"Concrete Monthly?" Don't think I've ever read that. Not enuf, sex and violence. Readers Digest is racy enough.

But, it is amazing, the amount of information available, for someone with the inclination to seek it out.
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Re: Hurricanes/wind/and round homes
Old 06-15-2006, 05:31 PM   #27
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Re: Hurricanes/wind/and round homes

Quote:
Originally Posted by katfish
bbuzzard

According to a N.C. modular builder (Deltec). There homes can withstand greater
force since they have no single flat section wider than eight feet. " this minimizes
large areas where wind can build and create pressure, which would collapse a
conventional square or rectangular home. The circular design insures any force exerted against one side of the structure is distributed out the opposing side."
So, (if true) it may be possible to build a conventional home that could hold up
as well but would it be cost affective? They also claim to have a one of a kind
roof system with optimal pitch to equalize any downward pressure or uplift.
What do you think?
I assume you mean a mnodular dome? Domes are very efficient structures under uniform loads. They do not do as well with unbalanced loading. However, while I am uncertain of the overall efficiency, I strongly suspect a dome home is more efficicent than a normally framed house under wind loads.

The concept that "The circular design insures any force exerted against one side of the structure is distributed out the opposing side" is bs (otherwise known as marketing speak. If this was true you could make the dome structure out of tissue paper, right?

The size of the panels does not matter. In a stick built house, the hosuje is built of small modules call 2x4s, and the buildings still fall apart.
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