Finding force in member BD using method of sections

Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
2 replies · 3K views
Spoolx
Messages
38
Reaction score
0

Homework Statement


Figured it would be easier if I showed a picture

http://img210.imageshack.us/img210/707/problemcz.jpg


Homework Equations


Ʃm=0
Ʃfx=0
Ʃfy=0

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?
Thanks!
http://img804.imageshack.us/img804/12/photo2sw.jpg
 
Last edited by a moderator:
Physics news on Phys.org
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.
 
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.