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Shear and Moment diagram for frame question

  1. Sep 21, 2013 #1
    Draw the shear and moment diagrams for each of the three members of the frame. Assume the frame is pin connected at A, C, and D and there is a fixed joint at B.

    PWuTxuL.jpg


    Please i need help with this .. would be great if anyone can help
     
  2. jcsd
  3. Sep 21, 2013 #2

    SteamKing

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    First, determine the reactions at A and D to keep the frame in equilibrium.
     
  4. Sep 21, 2013 #3
    on A i got 101 KN up and 90 KN to right, at D i got -11 Kn , i am not sure if these are right
     
    Last edited: Sep 21, 2013
  5. Sep 21, 2013 #4

    SteamKing

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    Well, that's easy to check.

    Take your reactions an see if they equations of equilibrium are satisfied.

    If not, rinse and repeat.
     
  6. Sep 22, 2013 #5
    think i got the reactions correct but im not sure bout my shear diagram doesnt look right
     
  7. Sep 22, 2013 #6

    SteamKing

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    Well, I'm not sure either. You'll have to post it.
     
  8. Sep 22, 2013 #7
    ok here is what ive drawn so far
     

    Attached Files:

  9. Sep 22, 2013 #8

    SteamKing

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    It's kinda blurry - can't make out any details at all.
     
  10. Sep 22, 2013 #9
    dw about the pic uptop just the shear diagram..does the shape look right
     
  11. Sep 22, 2013 #10
    How do you know the reactions are right? There is no point drawing the moment and shear diagrams if the reactions are not right. The reactions are checkable. So please send your calcs.
     
  12. Sep 23, 2013 #11
    i already sent my calculations. on reaction A i got 101 KN up and 90 KN to right, on reaction D i got -11 Kn downwards, i am going with these thanks for your help
     
  13. Sep 23, 2013 #12
    I haven't seen calcs for reactions, which I believe are self-evidently not correct. (For example, what is the bending moment at point C? I am sure you would say 'zero' because of the hinge there, but have you checked by taking the algebraic sum of moments on each side of C?)
     
  14. Sep 23, 2013 #13
    yes i am re doing the calculations now.. i will take a section at pin C and start summing from there
     
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