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Car Port post load calculation

  1. Feb 7, 2012 #1
    Good day everyone.

    I have built a car port post in an inverted L shape and want to calculate the load that it can support.

    I think I have “over-killed” the posts enough.
    I am curious to see how much weight this structure could hold.

    Any way of calculating the load at the area which support the wood beam ?

    All metal is 1/4" thick.
    Base mounting bolts/rod is 5/8"
    All joints are welded with arc-welding @ 7018 @ 1/8" rod.

    Concrete base 12" sonotube with 24" footing @ 8" thick.
    Embedded re-bar 2 part setup .

    See attached pictures.


    Attached Files:

  2. jcsd
  3. Feb 7, 2012 #2
    Other pics.

    Attached Files:

  4. Feb 7, 2012 #3


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    Where do you live?

    Where I live - in Canada, Sonotubes are not a good thing. Water seeps down, freezes in the winter and then pushes the concrete straight up the smooth inside of the Sonotube.

    And we gotta go down 36" - 48".

    (Just finished building my own carport.)

  5. Feb 7, 2012 #4
    Thanks for the reply Dave, I live near Ottawa, Canada.

    I have poured a 24" diameter footing @ 5ft deep then poured the sonotube on top of it with rebar joining the concrete footing and sonotube. Code require 4ft deep, I have 5ft, it should be good.

    Sonotube without "base/footings" if not deep enough will be moved out of the soil from freeze and thaw. (i.e. most people do the sonotubes for fences and dig only 24", 2 years after the fence is out of alignment).

  6. Feb 7, 2012 #5


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    Ah! (Chance were highly unlikely you were anywhere near as far North as I - let alone farther. High five!)
  7. Feb 7, 2012 #6


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    Jesoosi Chistoosi - are those four inch square steel tubes? You could park a second car up there!
  8. Feb 7, 2012 #7
    Almost ... 3.5" tubing @ 1/4" in thick.
    I know, it's overkill haha, but I would really like to see how much it can support.
    A car... or a dump truck ? haha.
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