Trent,
you are definitely going to need a structural engineer. I just finished building a storm shelter; I'm going to bury it, which adds a lot of ballistic protection.
When designing my shelter one of my best sources of data were a series pdfs:
http://faculty.delhi.edu/hultendc/AECT480-Lecture 6-REV.pdf
Change the "206" to 201-207 to get the other ones. There's a lot of high level data in there that was way above my head. But I think what you want is attainable at a lot less cost than you are looking at.
I built a 12 by 20 shelter for just over $3,000. It's 8" reinforced concrete everywhere but the roof, which is 7". It would be easy to add more rebar and increase the thickness of the slab. I poured 4,000 PSI concrete but that also could be increased.
You can see some pictures here: http://diystormshelter.com
I'm happy to try to answer any questions you might have.
Jowy
you are definitely going to need a structural engineer. I just finished building a storm shelter; I'm going to bury it, which adds a lot of ballistic protection.
When designing my shelter one of my best sources of data were a series pdfs:
http://faculty.delhi.edu/hultendc/AECT480-Lecture 6-REV.pdf
Change the "206" to 201-207 to get the other ones. There's a lot of high level data in there that was way above my head. But I think what you want is attainable at a lot less cost than you are looking at.
I built a 12 by 20 shelter for just over $3,000. It's 8" reinforced concrete everywhere but the roof, which is 7". It would be easy to add more rebar and increase the thickness of the slab. I poured 4,000 PSI concrete but that also could be increased.
You can see some pictures here: http://diystormshelter.com
I'm happy to try to answer any questions you might have.
Jowy
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