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Forces inside a bridge?

  1. Mar 29, 2016 #1
    1. The problem statement, all variables and given/known data
    How would you determine whether a member is in compression or tension given the bridge with external forces below?

    2. Relevant equations

    3. The attempt at a solution
    I don't need help finding the forces, I need help in figuring out compression/tension.

    Attached Files:

  2. jcsd
  3. Mar 29, 2016 #2


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    Science Advisor
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    It is not easy to determine compression or tension by inspection when numerical applied loads are given, except perhaps for a member or 2. When you don't have numerical values for the applied loads, generally you can't find tension or compression for most members, even by analysis, because it depends on the magnitudes of the applied forces. I don't recommend finding tension or compression by inspection except in the most obvious cases for specific members.
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