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Homework Help: Problem in finite element method using direct stiffness method

  1. Jul 25, 2013 #1

    This is a sample problem from logan finite element method. I have attached the problem and solution given in the book. As per the problem i first derived the stiffness matrix and den putting the boundary conditions started solving for the forces. I am stuck as three forces are unknown but when i checked the book it says the force at third node is zero. Can someone tell me why this force is assumed as zero?

    Attached Files:

  2. jcsd
  3. Jul 26, 2013 #2


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    F3x = 0 since only one applied force is present in the problem at node 4. So F4x = 5000 lb.
  4. Jul 27, 2013 #3
    But shudnt there be a reaction at 3rd node
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