STATICS truss/ math equation - joint by joint

  • #1
studying for my test, I have a truss joint equation with 2 variables

ƩFx = 0 : 4/15 (15kN) - 10/10.44(Fbd) - 4/5(Fbe) = 0

12 = .957(Fbd) + .8(Fbe)

ƩFy= 0 : 3/5 (15kN) - 6kN - 3/10.44(Fbd) + 3/5(Fbe) = 0

6 = 9 -.287(Fbd) + .6(Fbe)
-3 = .287(Fbd) + .6(Fbe)

this is where I'm stuck. I'm unsure what math move to make next to solve Fbd or Fbe.

I'm unsure, any help would be appreciated
 
Last edited:

Answers and Replies

  • #2
PhanthomJay
Science Advisor
Homework Helper
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First correct your 2nd equation plus and minus signs. You can then solve for one unknown in terms of the other in the first equation and substitute the result into the 2nd equation to solve for the unknowns.
 

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