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Reaction at pin and roller

  1. Sep 16, 2010 #1
    Determine the reactions at the pin A and at the roller at B of the beam.

    I honestly have no idea how to do this problem.
    It gives the answers as...

    Ax = 192 N
    Ay = 180 N
    By = 642 N

    Please help.

    Last edited: Sep 16, 2010
  2. jcsd
  3. Sep 16, 2010 #2


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    Heck, you've got to show something. Try listing the relevant equations. Note that the roller support can only provide vertical forces, not horizontal. The pin support can provide both. Use the equilibrium equations for forces and moments.
  4. Sep 20, 2012 #3
    As phanthom jay said above you have a roller joint at point B so you have just a vertical reaction force Rby since it is a pin joint at point A you have reaction forces Ray and Rax. The beam is inclined at 22deg
    The 500N force is resolved vertically giving 500/cos22

    SUM horizontal forces
    Ray + Rby=500/cos22

    SUM moment of forces about Point B
    Ray.8 - Rax.3.33=800

    so i get
    Rby= 1434.7N
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