How to Determine Forces in a 2D Truss Using the Joint Method?

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SUMMARY

The discussion focuses on determining the forces in a 2D truss using the joint method, specifically addressing a homework problem. The calculated forces for various members are Fab 2465 T, Fbd 1200 T, Fbc 1375 C, Fdc 750 C, Fde 860 T, Fce 649 C, and Fac 1922 C. Key advice includes ensuring accurate geometry for member slopes and determining joint support reactions first using equilibrium equations. The method of joints should start at the easiest joints to simplify calculations.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Familiarity with the method of joints in truss analysis
  • Knowledge of basic trigonometry for calculating slopes
  • Ability to apply the equation T = F x D in structural analysis
NEXT STEPS
  • Study the method of joints in truss analysis
  • Learn how to calculate joint support reactions using equilibrium equations
  • Review trigonometric functions for slope calculations in structural problems
  • Practice additional 2D truss problems to reinforce understanding of member forces
USEFUL FOR

Engineering students, structural analysts, and anyone involved in civil or mechanical engineering who is learning to analyze truss structures.

togo
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Homework Statement


2lw4x1g.jpg


Determine force of each member using joint method

Homework Equations


T = F x D


The Attempt at a Solution


2ytuvme.jpg


Answers are:

Fab 2465 T
Fbd 1200 T
Fbc 1375 C
Fdc 750 C
Fde 860 T (This one is what I tried)
Fce 649 C
Fac 1922 C

Thanks.
 
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I moved this thread to the engineering homework forum as you're more likely to get responses on this type of problem there.

You might want to forgo using a scanned image of your work, especially one so large, since it makes your post inconvenient to read.
 
togo said:
Determine force of each member using joint method

Homework Equations


T = F x D


The Attempt at a Solution


Answers are:

Fab 2465 T
Fbd 1200 T
Fbc 1375 C
Fdc 750 C
Fde 860 T (This one is what I tried)
Fce 649 C
Fac 1922 C

Thanks.
You have the wrong geometry for the slope of member DE...the rise is 20 but the run is 25, not 55...

Always determine joint support reactions first using the equilibrium equations; then start at the easiest joints next when determining forces using the method of joints. Also be sure to indicate T (force of member on joint pulls away from joint) or C (force of member on joint pushes toward joint).
 
thanks for that, encouraging to know I'm on the right track. Something did seem wrong with the trig
 

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