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PFC beam span

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  1. #1
    Apprentice (new member)
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    Default PFC beam span

    I want to remove one concrete support post under my house and bolt two 125 PFC steel Beams either side of existing hard wood bearer.The span between concrete posts would be 4.8m .The house is a 1960ís chamferboard style house with concrete tiles.
    Iím hoping that two 125PFC will be strong enough as head height is an issue .So if there are any engineers out there that could advise me it would be much appreciated
    Regards Kevin

  2. #2
    7K Club Member
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    Default

    This resource will help, but I imagine there may be some difference depending on beam manufacturer

    https://www.renovateforum.com/f221/s...-tables-99800/

  3. #3
    Deactivated User
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    Default

    Without knowing more detail i'd be inclined to acro prop the structure up and replace the hardwood bearer completely with the appropriate sized UB or TFB . With no detail solid advice cant be given

    https://www.edconsteel.com.au/library/steel_housing.pdf

  4. #4
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    Sep 2008
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    Default

    0422d34b-2716-459f-91cc-99b35e02143d.jpg281bfca3-c9d0-4289-a532-b6ac9d73ff2c.jpg7cc32d02-0bde-4d83-a652-dcbde6f04be5.jpg84db1e14-4d48-4cbf-9d55-f00dbc06c574.jpg

    I have have taken a few photos that show the concrete stumps/ bearer setup
    The bearers are 125mm x 75mm
    Concrete stumps are 200mm x 200mm
    I need to remove one concrete stump to give me room to store my brothers jetski
    The span between the concrete posts will be 4.4 metres once the post is removed
    I’m hoping to mount two 125PFC steel beams (one on either side of existing bearer) onto existing concrete stumps
    Once mounted onto concrete stumps I will bolt the steel beams to the existing bearer using 12mm threaded rod
    This will mean I have the existing bearer sandwiched between two steel beams
    If this isn’t strong enough I will put steel posts along side existing concrete stumps and mount appropriate steel beam to them
    Hope this makes some sort of sense

  5. #5
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    Default

    Sounds reasonable - you need to check your FLW, and whether there are supporting wall above etc, but my reading (non engineer) is a single is likely just underdone on likely FLW, so a double as proposed is required. Generally for that sort of span and average FLW, doubling a member adds about 25% to span capacity -that’s with timber LVLS

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