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Method of joints - Truss

  1. Mar 8, 2015 #1
    1. The problem statement, all variables and given/known data
    http://oi59.tinypic.com/2h65cm1.jpg



    2. Relevant equations


    3. The attempt at a solution

    All triangles: angles A = B = 53.13 degrees, angle C = 73.74 degrees

    from cosine law and the 180 degree rule


    But it looks like all of the joints in the bridge have more than 2 forces? Which joint should I start at?

    I was going to start at B but it looks like i have the 3000 lb force, then BC, BE and BA forces which would be too many.
     
  2. jcsd
  3. Mar 8, 2015 #2

    PhanthomJay

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    Always determine the support reactions first. Then start at a joint or joints where there are just 2 unknown member forces, then proceed to the others.
     
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