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  1. #1
    Join Date
    Apr 2013
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    4

    Default Aluminum I beams

    Can any one tell me what size 6061-T6 beams I need for a walkway spanning 24 feet by 36" wide? Thx

  2. #2
    Join Date
    Sep 2005
    Location
    northern NJ
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    1,821

    Default

    Any other supports/truss or will the I beams be the only thing supporting all the weight? Will they be flat or crowned?
    MM250
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  3. #3
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,376

    Default

    look at an aluminum scaffold pik

  4. #4
    Join Date
    Apr 2013
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    4

    Default I beams

    Quote Originally Posted by MMW View Post
    Any other supports/truss or will the I beams be the only thing supporting all the weight? Will they be flat or crowned?
    Supported each end by existing walls. Flat thx

  5. #5
    Join Date
    Apr 2013
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    4

    Default

    Quote Originally Posted by Pjenks835 View Post
    Supported each end by existing walls. Flat thx
    PS low traffic area office environment

  6. #6
    Join Date
    Nov 2009
    Location
    western mass
    Posts
    201

    Default

    I'm no engineer but I would think they'd have to be fairly big. 24' no supports. I would think there would be a lot of deflection. If it needs railings you could incorporate a truss system into that. But really a lot of variables. Need a lot more info
    Last edited by cayager; 04-30-2013 at 06:39 PM.

  7. #7
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
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    4,376

    Default

    this is really something where the whole picture is needed, design etc.

  8. #8
    Join Date
    Apr 2013
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    4

    Default

    Quote Originally Posted by Sberry View Post
    this is really something where the whole picture is needed, design etc.
    Thx guys. My gut tells me it needs a center support. I'll bite the $ bullet and have an engineer spec it.

  9. #9
    Join Date
    Sep 2009
    Location
    Colorado
    Posts
    199

    Default Deflection is key

    The thing about long beams, and especially aluminum, is the strength is only part of the story. Deflection (sag) is likely the limitation. Even if is is strong enough to be safe, no one will want to walk on it if it sags two inches in the middle.

    A typical deflection limit for a live load would be L/360, about 0.8 inches in a 24 foot span. Some architects use lower limits to make the floor feel more substantial. As I understand it, that would be the difference from the no load deflection and the fully loaded case. You would have to figure out the maximum load for the beam, and then calculate the deflection.

    Good idea to get an engineer involved. Should save money in the end by preventing overdesign or rework.

    Richard

    Quote Originally Posted by Pjenks835 View Post
    Can any one tell me what size 6061-T6 beams I need for a walkway spanning 24 feet by 36" wide? Thx

  10. #10
    Join Date
    Aug 2004
    Location
    Milan Michigan
    Posts
    1,671

    Default

    My guess is a 12" beam that weighs about x 14.29Lb Ft.

    This is for 2 beams running parallel with a plank of some type connecting them together on the top side and 2 crossmembers maybe 3 on the bottom.

    However, It does not make sense that you would not have a handrail, If the hand rail is done right you could use a much smaller beam.

    I'm not a engineer but Its close enouph for quoting the job.

    And this is for foot traffic.

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