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Originally Posted by javadog
You don't specify whether or not you will have risers in addition to the treads. If so, they will add considerable stiffness to the stairs. Rather than make the center support out of plate, I would suggest you make it in a box section. The wider and deeper, the better. If it contains internal bulkheads, so much the better. I would use a structural adhesive on any mechanically fastened connection. You can also use the railing on both sides to substantially stiffen the structure, depending on how it's constructed.
I don't know if you are building this in a permitted project, you might consider getting an engineers stamp on whatever design you come up with.
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I agree with the above, this is why drawings help, they are part of the design process and problem solving.
Right now nobody has any idea how all the parts fit together because it has not been drawn.
Plan view, elevations, sections and details in addition to any 3D sketches showing intent are necessary.
What you started out describing sounded a lot like what is built in Europe, our building codes will not allow for such artistry.
My feeling on this is you are perhaps building this in an earthquake zone, which means all bets are off. You better hire a structural engineer TRE Cup.
Recent Earthquakes Near Van Nuys, California, United States
https://earthquaketrack.com/us-ca-van-nuys/recent
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17 earthquakes in the past 30 days
246 earthquakes in the past 365 days
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