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Thread: Steel beam span table help

  1. #1
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    Steel beam span table help

    Can some clever person tell me what the loading is for the following RHS beams please. I can't find any tables for steel only the timber span tables in 3604

    A beam 200 x 100 x 6mm spanning 4 metres.

    A beam 150 x 50 x 5mm spanning 4 metres.

    If the loadings for the same beams with shorter spans this would be very helpful.
    'Bother' said Pooh, as he chambered another round ... Wong Far King Way

  2. #2
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    Hopefully there's a structural engineer on here to give you an idea. But a bit more info from you might help, what are you planning on spanning? Doors/windows, mid floor or subfloor. Ie just roof load or floor load also.
    What sort of cladding or roofing is to be used?
    All this information needs to be considered to calculate loads and spans. A scribble/sketch might help a little as well.

  3. #3
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    Have you tried the manufacturer of the beams?

    If your project involves a building consent you will probably require the services of a structural engineer who will provide structural detailing, calculations and a PS1.
    Voltair once said: if you want to know who rules you, ask who you can't criticize.

    "You have enemies? Good. That means you've stood up for something, sometime in your life." ~Winston Churchill

    "Socialism is philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery"~Winston Churchill

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    Ok we are planning to have a 5 x 12 metre relocatable freezer built.
    The engineer has designed a floor with three 150 x 50 bearers 12 metres long and told the builder he would issue a PS1 for it. This is a base that the engineer previously designed for portable office / habitable builds.

    The engineer has now changed the plans for the base and wants three 200 x 100 bearers instead of the 150 x50's. He wants the Hot dip galved, which for the three plus two more for lifting points adds $7800 to the build.
    My contention is that instead of three 200 x 100's we could use additional 150 x 50's to boost up the load rating of the floor. I need to know how the loading of one section compares to the other to make this argument.
    'Bother' said Pooh, as he chambered another round ... Wong Far King Way

  5. #5
    MSL
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    Velvet storage?

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    wouldnt 2 forty foot reefer containers work out cheaper and easier to move?

  7. #7
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    Quote Originally Posted by berg243 View Post
    wouldnt 2 forty foot reefer containers work out cheaper and easier to move?
    You would think so but no. This freezer was quoted at $51,000 and 40's are $40,000 each new and use more power

    MSL - Pet food
    'Bother' said Pooh, as he chambered another round ... Wong Far King Way

  8. #8
    LRP
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    Talk to the same engineer. That sort of calculation is elementary and he has likely decided that you need to go to the bigger section RHS for this particular project. Maybe if the freezer gets to be filled with product it will be a very different situation to it being used as a "habitable building" ? The Engineer has obviously done his revised calcs on a potentially much higher load than what he first used.
    One thing's for sure is that the load rating for the bigger beam will be MILES higher that the smaller one you mention here. I suspect you could get there with additional smaller beams but you would probably need LOTS of them.
    Sorry I can't answer your question as it's way to long ago that I used those calcs.
    rugerman and Moa Hunter like this.

  9. #9
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    Quote Originally Posted by LRP View Post
    Talk to the same engineer. That sort of calculation is elementary and he has likely decided that you need to go to the bigger section RHS for this particular project. Maybe if the freezer gets to be filled with product it will be a very different situation to it being used as a "habitable building" ? The Engineer has obviously done his revised calcs on a potentially much higher load than what he first used.
    One thing's for sure is that the load rating for the bigger beam will be MILES higher that the smaller one you mention here. I suspect you could get there with additional smaller beams but you would probably need LOTS of them.
    Sorry I can't answer your question as it's way to long ago that I used those calcs.
    I am sure the engineers calcs are correct, however it is not a cost effective solution. With only three beams the sides are actually cantilevered 450 mm beyond the outer beam.
    A more cost effective solution would be 150 x 100 round the outside with additional members spaced across the base. I just don't know the numbers. We can buy the 150's in duragalv but the 200 x100 needs Hotdipped at a cost of $5000.
    When you write the bigger beams loading will be miles higher, by what sort of factor at a guess 2x 3x would you think ??
    'Bother' said Pooh, as he chambered another round ... Wong Far King Way

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    BRANZ have an online calculator that I sometimes use. You have to register & login to use it. It will provide you with beams sizes for given spans & loads. To get the answer from the software cost nothing, to get the calculations & PS1 you have to pay, but it is relatively cheap. Works for simple jobs.

    Carter Holt have some software that is free. With it you can calculate the sizes of ,rafters, beams, joists, lintels, bearers, studs ,etc in stress graded timber or their laminated/engineered timber sections.

  11. #11
    LRP
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    Quote Originally Posted by Moa Hunter View Post
    I am sure the engineers calcs are correct, however it is not a cost effective solution. With only three beams the sides are actually cantilevered 450 mm beyond the outer beam.
    A more cost effective solution would be 150 x 100 round the outside with additional members spaced across the base. I just don't know the numbers. We can buy the 150's in duragalv but the 200 x100 needs Hotdipped at a cost of $5000.
    When you write the bigger beams loading will be miles higher, by what sort of factor at a guess 2x 3x would you think ??
    I would be just guessing mate. The engineer should provide a TOTAL solution, taking into account the cantilever occurring at the sides. He would provide a design solution with the method you are proposing too, if you say to him/her that's what you want. That's what you're paying for.
    There is always a cheaper solution, but ......

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    Have you explained to the engineer your situation with regards to the increase in bearer size and the price difference.
    Explain that you'd like a 150 bearer option to consider if that means an extra bearer or 2. It might also mean your pile spacing's might need to close up as well to support the load.

    The step up from the 150 - 200 in moments of inertia / a term used for bending stress is considerable. it jumps up 4x the amount so hopefully you can get a solution you want.

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    Met with engineer today and told him his design was not a cost effective solution etc. He reckons that the Hot Dipped 200 x 100 bearers will act as sacrificial anodes to the EP galv joists and extend the life of the build to beyond fifty years, I told him sounded like porkys as the steel is well off the ground with good airflow besides which who gives a fuck as we will all be dead sooner than that
    'Bother' said Pooh, as he chambered another round ... Wong Far King Way

  14. #14
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    what about spray galv on the big beams instead of hot dip , going by price difference on a trailer i was quoted it should be about a fifth the cost.
    Moa Hunter likes this.

 

 

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