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Homework Help: Twisting at shear center / centroid

  1. Nov 27, 2016 #1
    1. The problem statement, all variables and given/known data
    In the notes , the author stated that when the force is applied through the centorid of cross section , the channel will bend and twist.
    but , on the second page , the author stated that the shear center lies on an axis of symmetry of member's cross sectional area...
    So, i am confused whether the member will twist or not when the force P is applied thru the centroid or shear center ....

    Why the shear center is located at O , which is located outside of the C channel ?

    2. Relevant equations

    3. The attempt at a solution
    Is there anything wrong with the notes ?

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  2. jcsd
  3. Nov 27, 2016 #2
    In the notes , it's also stated that to prevent twisting , the P should be applied at O , does it mean we have to apply the force thru the centoid and also at the O at the same time to prevent twisting ? i'm confused
  4. Dec 3, 2016 #3
  5. Dec 28, 2016 #4
    what is the meaning of the force is applied along the once vertical , unsymmetrical axis that passes thru centroid ??? Since the applied force already passing thru centroid , it's already the symmertical axis , right ????
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