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Sidesway of a frame

  1. Feb 10, 2017 #1
    1. The problem statement, all variables and given/known data
    How do we know that the MBC larger than MCB ?

    2. Relevant equations


    3. The attempt at a solution
    I think MCB is larger than MBC because the moment of P about C is larger ... So to resist moment of P about C , opposite MCB is required... Thus, MCB is larger
     

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  3. Feb 10, 2017 #2

    haruspex

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    Yes, the diagram is badly drawn. With P near the left, I do not believe the structure would sway to the right like that. It just doesn't feel right. It would all make sense if P were to the right of half way.
     
  4. Feb 10, 2017 #3

    CWatters

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    Ive got a feeling they just got the subscripts wrong and it should say..

    MCB is larger than MBC

    Eg with p on the left it does move to the right.

    I
     
  5. Feb 10, 2017 #4

    CWatters

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  6. Feb 10, 2017 #5

    haruspex

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    Looking through it again, I agree with you. Thanks.
     
  7. Feb 10, 2017 #6
    So , the concluison now is MCB is larger than MBC ??
     
  8. Feb 10, 2017 #7

    haruspex

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    Yes, it's just a typo, as CWatters posted.
     
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