Dome test & Dome shelter

This 15′ 9″ 2″x4″ half scale model of our full sized dome product was subjected to a failure load at the University of Alabama’s large structure testing laboratory.

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Interior attachment was thru a 1″ diameter grade 8 bolt and eyelet attachment on the points of the cupola in normal configuration.

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Well secured at the bottom thru a 1″ steel plate with similar grade 8 bolts and eyelets connected to a jack under the floor which would pull it to “failure”

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This occurred at 44,000 lbs.

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 The DOME didn’t fail…the scaled down straps pulled the short nails in the smallest of the strap test configurations. Our intent was to demonstrate the role the proper strapping played in increasing the strength of our domes.

Simply stated…that’s 6 to 10 TIMES stronger than standard framing, even allowing for 2×6 and 2×8 rafters!


After the test one side….

straps after 1

And the other

straps after2

They get bigger…

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This particular model is rated for any cat 5 hurricane just as you see it. Another layer of plywood and extra strapping and it becomes a full fledged tornado shelter. Fully FEMA compliant for wood framed shelters!


So let’s talk for a moment about those FEMA “compliant ” shelters.

Here are the various stages of our “World’s First FEMA 361G tornado shelter which doubles as our new manufacturing facility.

Our basic 2×6  domes already meet FEMA requirements for tornado shelters at 250 mph, so the approved specification for missile impacts is met by adding additional plywood and metal plate.  Easy enough.

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We did a little ballistic testing of our own this month by subjecting our  metal reinforced shelter panels to impacts a little faster than your average FEMA flying 2×4 at 100 mph.

Backed off 25 yards and started shooting them.

We started with low power .22, then mid, then Yellow Jackets,then .22 magnum, no dents in the metal visible on back side after penetrating 1 1/2″ of plywood. Next up was 9 mm, then .41 SW.

Nada.

Nobody had a .45 so we had to settle for what I was sure would do it…357 magnum from 8 1/2″ barrel.

Nope!

Soft point .308 bent the heck out of it but it took Full Metal Jacket .308 to get through badly deformed. From 25 yards.


 

 Independent lab confirmed results


cal/dia./grain/ft per sec/bullet energy/result/FEMA min/result
.22          65      1750         3079        no penetration    972    + 300%

9mm      115     1500         3893       no penetration     972   +400%

.41 SW   140     1100         6896      no penetration     972    +700%

.357 mag 125   1400         6397      no penetration      972    +700%

.308FMJ  165   2700       35868    penetration           972    +3700%

Conclusions.

One Full Metal Jacketed bullet penetrated the steel inner liner of a New Age Dome shelter series panel, with an impact force 37 times greater than FEMA approved specs.

All other bullets were stopped from penetrating with a factor 3-7 times greater than approved specs, with all allowances made to show forces on even scale.


 

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You can see how an impact load is transferred much the way a spider web absorbs energy. Anything pushing one way has a web of framing members pushing back.012

And here we are…latest shop 008

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The NEXT time somebody walks in my shop and asks me where Ive built a FEMA compliant shelter before, I’ll tell them, “You’re standing in it”. Still got a few pieces of siding and trim going on, with dome 2 on the cutting table.


Consider these facts…

A study performed by Texas Tech and Colorado state university in 1998  demonstrated why a dome has a better ability to deflect wind.

A rectilinear of “box” structure is impacted by an F5 tornado at the rate of 400 lbs per square foot. NOT expected to survive a tornado strike at all. So you can reason out why the common thought for storm protection in box form is immensely thick walls.  In short…Build a bunker. Ugly…and useful for one purpose.

To HIDE in.

A DOME is impacted by an F5 tornado at the rate of only 100 lbs per sq ft. So if your dome is rated for more than that you can reasonably expect it to survive and at have SOME damage from debris to repair.  Our 40′ residential domes are rated at 250 MPH wind. Resilient!

Useful for community centers, or other practical purposes yet STILL possessing the structural integrity to shield it’s occupants from danger. Why rush to a shelter when you are safe at home?


 

Lets be honest…the odds of being struck by a tornado are far less than the more common problems with storms…wind driven debris or trees toppling.This tree caused incredible damage. This box could only take about 2-4 tons till it broke.

OLYMPUS DIGITAL CAMERAOur dome  was impacted by a 120′ white oak tree in this same storm and subjected to an oblique force of over 150,00 lbs. That’s 75 tons!

OLYMPUS DIGITAL CAMERADidn’t even come through the drywall!