[486]
ugh, that guy again?
Been thinking further about my concrete plans for next year once this shit thaws
Was looking at buying a few containers and tossing a steel roof between them, then ran the numbers and for only a little more I can do poured concrete.
Figuring on making a building that is 30x40.
I really like the idea of earth sheltered stuff, so it'll be all poured with an arched roof.
Imagine an 8-10' tall silage bunker with a roof on it, then a few feet of dirt on top of that.
I'm having a ton of trouble finding information on the roof arch design. Almost like there's schools out there making tons of money on this shit.
Basic shit I've found says that the arch height should be at least 1/10 the span, and more height atop that reduces thrust pushing the walls out
so at a 30' span I'd want at least 3' of height in the middle
I'm fine with running a few tension rods at the base of the arch through the building, so I figure I'll keep it near that minimum figure
the question comes in here
I plan on having a wall run down the middle of the arch, dividing it into two 15 foot wide bays
conventional wisdom would have me just make two 15 foot wide arches, would certainly be easier to form up, but it makes for trapped water in the center
Curving the two arches in the other direction as well would solve drainage but jeez louise I don't know if I can figure out how to make all that not horribly wavy and shitty looking.
If I support the center of the arch does it make it into some sort of form with no strength that'll collapse and kill me?
I'm thinking it might put some of the roof in tension rather than all of it in compression.
Figuring on 8-10" thick walls, then the center divider being something like 6" because I figure it'll be taking less of the load than the side walls due to how the arched roof works?
inb4 hire a structural engineer
Was looking at buying a few containers and tossing a steel roof between them, then ran the numbers and for only a little more I can do poured concrete.
Figuring on making a building that is 30x40.
I really like the idea of earth sheltered stuff, so it'll be all poured with an arched roof.
Imagine an 8-10' tall silage bunker with a roof on it, then a few feet of dirt on top of that.
I'm having a ton of trouble finding information on the roof arch design. Almost like there's schools out there making tons of money on this shit.
Basic shit I've found says that the arch height should be at least 1/10 the span, and more height atop that reduces thrust pushing the walls out
so at a 30' span I'd want at least 3' of height in the middle
I'm fine with running a few tension rods at the base of the arch through the building, so I figure I'll keep it near that minimum figure
the question comes in here
I plan on having a wall run down the middle of the arch, dividing it into two 15 foot wide bays
conventional wisdom would have me just make two 15 foot wide arches, would certainly be easier to form up, but it makes for trapped water in the center
Curving the two arches in the other direction as well would solve drainage but jeez louise I don't know if I can figure out how to make all that not horribly wavy and shitty looking.
If I support the center of the arch does it make it into some sort of form with no strength that'll collapse and kill me?
I'm thinking it might put some of the roof in tension rather than all of it in compression.
Figuring on 8-10" thick walls, then the center divider being something like 6" because I figure it'll be taking less of the load than the side walls due to how the arched roof works?
inb4 hire a structural engineer