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Shear force diagram

  1. Oct 17, 2016 #1
    1. The problem statement, all variables and given/known data
    In this question , the 45N is acting at 0.6m from B ....
    why the author put the 45N forces at D in the shear force diagram ? Is it wrong ?
    2. Relevant equations


    3. The attempt at a solution
    IMO , the 45N should be put at 0.5m from D . Correct me if i am wrong
     

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  3. Oct 18, 2016 #2

    haruspex

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    Looks to me that it is 0.6m from D and 0.9m from B.
     
  4. Oct 18, 2016 #3
    sorry , i mean the 45N is acting at 0.6m from D .
    Why , in the diagram , the author' bring down' the graph by 45kN at point D ? the graph should go down by 45kN at E ( which is 0.6m from D ) , right ?
     
  5. Oct 18, 2016 #4

    Mapes

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    It may help to draw a free-body diagram of just the "handle" attached at D. For equilibrium to be satisfied in the handle, what is the force and moment required to act on the handle at the point where it connects to the beam? Once you determine this, recall that equal and opposite reactions must act on the beam from the handle.
     
  6. Oct 18, 2016 #5

    haruspex

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    Same issue as in the other thread. The beam feels the forces and moments at the point of attachment, D.
     
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