I am puting elevated 7inch thick slab of concreet on on top of 2 12"x8"x.5" rectangular steel tubing with a free span of 30 feet. Slab is 7.5'x30'. Is tubing overkill and how much rebar and what size do I need. This is a extension of my existing concreet walkout deck off my house. It will need to suport people weight. What grade of concreet should I order how many bag mix. I am using tubing instead of I beam because birds nest on I beam.
you can not figure concreet wihout knowing what suports it and visa versa
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I got no answer other than wanting more money so not interester I can have local shop I trust answer for less
I'm sorry you feel that way, but I can assure you that you will not get a licensed PE to answer this for less than your deposit here - it will be more in the 300 range, at a minimum.....with no stamp.Of course you can design each separately, I do it every day. The slab design is dependent only on the span and loading, that has nothing to do with the actual size of the steel beams. The beam can be designed with the load, span, and beam spacing.....it has nothing to do with the actual rebar in the beam. The slab thickness would make a difference, but you've defined the thickness an are only asking for the rebar.I do wish you the best with your project.