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: Structural Analysis - Trusses

  1. Jul 23, 2010 #1
    1. The problem statement, all variables and given/known data
    Below is a truss system, use the point method to solve for all forces within the trusses.


    my question, If I take pin F then I have 4 trusses, 2 of them known(FE, FD) and 2 unknowns(GF, CF). exactly what should I do with truss GF and FC, they have forces in x and y axis.

    2. Relevant equations

    3. The atthis is what I've found so far
    FDE=2.6 (T)
    FFE = 3 (C)

    FCD = 2.60 (T)
    FDF = 1 (T)tempt at a solution
  2. jcsd
  3. Jul 23, 2010 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    At F, solve for the member forces under the known x component of force from FE, then solve for the member forces under the known y components of force from FE and FD, and then add the results together. Also, your forces in DE and FE are not right, you seem to have assumed a 30 degree angle, which it is not.
  4. Jul 24, 2010 #3
    oh ok thanks.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook