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Need help with trusses 
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#1
Mar1512, 05:11 AM

P: 5

Hey guys
So I'm trying to solve this truss problem and get all the reactions of the trusses I've done it so many times but my equations never work out and I get crazy answers :\ I've found the reactions at A and B Ax=50kN Ay=72kN By=128kN My answers for tryingto solve it are Pac=90kN Pad=104kN Pce=6.66kN Pcd=177.3kN Pde=295.5kN Pdb=132.4kN I just can't see where I went wrong? Can someone help me out here?:( Thanks 


#2
Mar1512, 10:37 AM

P: 2

I found A_{x}= 50 too, but I found A_{y}=96kN and B_{y}=104kN.
To find A_{y} and B_{y} I used moments. Taking the moment around A you find the equation. M_{a} = 100kN(2.25m) + 100kN(4.25m)  B_{y}(6.25m) When you solve this I get B_{y} = 104kN. From their you just take 200kN  104kN and that gets you A_{y}=96kN. I think this should help you get on the right track from here. 


#3
Mar1512, 05:06 PM

P: 5

What about the 50kN force?
Why didn't you use that in your moment equation? 


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