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Homework Help: Statics: pratt truss calculation check

  1. Dec 6, 2007 #1
    1. The problem statement, all variables and given/known data

    please find it attached as pdf.

    2. Relevant equations

    joint method was conducted.

    3. The attempt at a solution

    please find it attached. i spent so much time on this and i took statics like 1.5 years ago. can you help me find my mistake? i can't seem to find why is my center joints not canceling out.

    oh does anyone know how to use RISA? this is for a project in my experimentation class.

    Attached Files:

  2. jcsd
  3. Dec 6, 2007 #2
    oh i know i know, i'm a civil and i know statics is a foundation for civil engineering =P but man... im so pissed off because of this! i redid it like 5 times. i really need to finish this by tomorrow because i'm actually testing a the real thing on the truss machine. will post pics of the testing if i manage to finish this.
  4. Dec 7, 2007 #3


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    Don't know about RISA, but you made a math error at joint B in calculating BG..otherwise, you're doing good...
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