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Math Help - stress in structures

  1. #1
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    stress in structures

    Ok, this is for an into to architectural structures class.

    If a cubic foot of concrete weighs 150lbs/ft^3 (p/cf), how many cubes would you need to stack on top of each other for there to be a stress of 3000lbs/in^2 (p/si) on the bottom cube

    I know you have to convert. Clearly you dont convert p/cf into p/si...but I really have no idea.

    Any help would be greatly appreciated (:

    thanks
    Last edited by discobob; June 21st 2011 at 10:14 AM.
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  2. #2
    Super Member
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    Re: stress in structures

    total weight on the bottom cube = n*150 lb.wt
    stress = n*150 lb.wt/ft^2 = 300 lb/in^2 = 300*144 lb/ft^2
    find n.
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