1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Statics Truss Problem, Stuck at force in one member. Please help

  1. Jul 14, 2012 #1
    1. The problem statement, all variables and given/known data
    Figured it would be easier if I showed a picture

    http://img210.imageshack.us/img210/707/problemcz.jpg [Broken]

    2. Relevant equations

    3. The attempt at a solution

    Here is my attempted solution, I am missing member BD and not sure which way to solve it, I tried sectioning it again and it provides too many unknowns. I tried taking a FBD at joint B and D but again too many unknowns.
    Any suggestions on which way to go?
    http://img804.imageshack.us/img804/12/photo2sw.jpg [Broken]
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Jul 14, 2012 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    After solving for reactions and determining angles you should cut a section thru BD and sum moments about the left support. You may have done this but I can't read your calcs from this I phone tiny screen.
  4. Jul 16, 2012 #3
    If you solve the joints in order ABCDE, then, in each case, there are just two unknowns to solve for. This is the method of joints which is a subset of the method of sections in which no moment equations are used.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook