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Shear stress resisted by a bolt

  1. Jan 6, 2017 #1
    1. The problem statement, all variables and given/known data
    In this problem , why the author use (30x10^3) /s = VQ / I only ? Shouldnt it be 4(30x10^3) /s = VQ / I

    2. Relevant equations


    3. The attempt at a solution
    I said so , because the board at the centered is connected by 4 bolts , 2 on the left and 2 on the right . The faces on the right also resisted by the same arrangement of nails , right ?
     

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    Last edited by a moderator: Jan 7, 2017
  2. jcsd
  3. Jan 8, 2017 #2

    PhanthomJay

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    Where did the 30x10^3 come from? Regardless, your method is wrong. In determining Q for bolt shear, either you use the top right board full area, or the top left board full area, or the middle and 2 bottom areas divided by 2 ( this last method not recommended, but may help conceptually with your understanding).
     
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