Solving Truss Problems: Need Help!

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SUMMARY

This discussion focuses on solving truss problems, specifically calculating the reactions at supports A and B. The user initially calculated Ax as -50 kN, Ay as 72 kN, and By as 128 kN, but received inconsistent results. Another participant clarified that using moments around point A, they calculated By as 104 kN and Ay as 96 kN, suggesting the inclusion of all forces in the moment equation for accurate results. The key takeaway is the importance of correctly applying equilibrium equations and considering all forces in truss analysis.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Knowledge of truss analysis techniques
  • Familiarity with calculating moments
  • Proficiency in using free body diagrams
NEXT STEPS
  • Study the method of joints in truss analysis
  • Learn about the method of sections for truss problems
  • Review the principles of static equilibrium in engineering mechanics
  • Explore software tools for structural analysis, such as SAP2000 or ANSYS
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Engineering students, structural engineers, and anyone involved in mechanical design or analysis of trusses will benefit from this discussion.

Joelllllll
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Need help with trusses!

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
 

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I found Ax= -50 too, but I found Ay=96kN and By=104kN.

To find Ay and By I used moments. Taking the moment around A you find the equation.

Ma = 100kN(2.25m) + 100kN(4.25m) - By(6.25m)

When you solve this I get By = 104kN. From their you just take 200kN - 104kN and that gets you Ay=96kN.

I think this should help you get on the right track from here.
 


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

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