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Finding real force in trusses

  1. Jan 25, 2017 #1
    1. The problem statement, all variables and given/known data
    It's given that the applied force is 10kN at F and 25kN at E . I have trouble of finding the other real force in the member of the trusses .

    2. Relevant equations


    3. The attempt at a solution
    So , i start by drawing the FBD at F . I have 10kN point downwards , so the reaction is 10kN upwards , so it's in equilibrium . But , i really have no idea how the author get the reaction 15kN ( in tension) pointing to the left and to the right . Can someone explain about it ? ( i have draw the FBD at E inside the second diagram)
     

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  2. jcsd
  3. Jan 25, 2017 #2

    haruspex

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    Consider the triangle ABF as a rigid body in its own right. Take moments about B.
     
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