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load capacity of square steel tube

I am building a house and the draftsman says that standard 3" round steel
jackpost which are rated at 8000lbs each would be borderline, how much
weight will 3"x3"x1/4" wall square tubing support?
Reply to
habbi
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A deliberately vague answer-it depends on the length and the assumption of the end restraint conditions....
Best answer is "whatever the structural engineer specifies and inspector approves"
Reply to
Rick
This is one of those questions that lots of guys would hesitate to answer. What if one of us said 10k pounds and you built it and it fell down in a storm?
I suggest you look this up in Machinery's Handbook and if I were you I would suggest being conservative. Build it once to last forever. Steel is cheap compared to rebuilding.
And the thing you're worried about here is crumple mode. So your end design may well have stiffeners welded to the sides of the tube.
GWE
Reply to
Grant Erwin
I've scanned and posted column analysis here:
formatting link

Reply to
Rick
Sorry, but this is something you don't want to fool around with. Take your plans to a certified Structural Engineer and get him/her to review them. The engineer will make recommendations and provide you with the necessary calculations for the building permitting process. Should cost around $250, a small investment to avoid unnecessay worry and headaches with the inspector.
Reply to
Kelly Jones
Most of the standard round posts I see in the building centers have rated capacities well in excess of 8,000 pounds. Round post, 4" of adjustment. Check them out.
I had some posts and beams special made at my local steel yard. I certainly could have made my own, these came with certs that the building inspector accepted. Paid retail price for the steel, delievery was included. All in all, a good deal.
habbi wrote:
Reply to
RoyJ
I think Marks Handbook has values for steel pipe filled with concrete. The concrete keeps the pipe from buckling as well as supporting load.
Dan
Grant Erwin wrote in message
Reply to
Dan Caster
Anyway I ordered 4 X 4 X 1/4" wall square tubing and I think it will be way overkill but anyway still much cheaper than the local engineering/steel erectors want.
Reply to
habbi
I designed and built the steel columns that support the glue-lam beams in our basement. Without more detail, all I can tell you is my 3"x3"x3/16" square tube columns, 7.2' in length were ssomewhat overkill in my house but that was fine with me and the steel was available locally.
Ted
Reply to
Ted Edwards
After you reach a certain length, buckling is the critical element.
John
Reply to
john
Do think about filling them with concrete. It will increase the amount they will support, and also help a little with increasing the life if there is ever a fire. Steel columns fail rather quickly in a fire.
Dan
Reply to
Dan Caster
and only the elastic modulus matters not the tensile or compressive strength if the column is long enough.
Ted
Reply to
Ted Edwards
Ah man what a bunch a sissys. What if what if. Sir if I had to translate the answers... Well I don't have a clue in hell how much they support...because we have never tested that particular product for that circumstance.
Reply to
Mr chrome

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