How Do You Solve for Unknown Forces in a Truss System Using the Point Method?

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SUMMARY

The discussion focuses on solving for unknown forces in a truss system using the point method. The specific truss members mentioned include FE, FD, GF, and CF, with known forces of 2.6 T for FDE and 3 C for FFE. The correct approach involves analyzing the known x and y components of forces from FE and FD to determine the forces in the unknown members GF and CF. Additionally, it is crucial to accurately assess angles in the truss, as incorrect assumptions can lead to errors in calculations.

PREREQUISITES
  • Understanding of truss systems and their components
  • Familiarity with the point method for force analysis
  • Knowledge of vector resolution in two dimensions
  • Ability to apply static equilibrium equations
NEXT STEPS
  • Study the principles of static equilibrium in truss analysis
  • Learn how to accurately resolve forces into x and y components
  • Explore the implications of angle assumptions in force calculations
  • Practice solving truss problems using the point method with various configurations
USEFUL FOR

Engineering students, structural analysts, and anyone involved in mechanical design or civil engineering who seeks to understand truss force analysis using the point method.

petersun825
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Homework Statement


Below is a truss system, use the point method to solve for all forces within the trusses.

http://tinypic.com/view.php?pic=25i2dma&s=3

my question, If I take pin F then I have 4 trusses, 2 of them known(FE, FD) and 2 unknowns(GF, CF). exactly what should I do with truss GF and FC, they have forces in x and y axis.

Homework Equations





3. The atthis is what I've found so far
http://tinypic.com/view.php?pic=2q9ig05&s=3
FDE=2.6 (T)
FFE = 3 (C)

http://tinypic.com/view.php?pic=f52428&s=3
FCD = 2.60 (T)
FDF = 1 (T)tempt at a solution
 
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At F, solve for the member forces under the known x component of force from FE, then solve for the member forces under the known y components of force from FE and FD, and then add the results together. Also, your forces in DE and FE are not right, you seem to have assumed a 30 degree angle, which it is not.
 
oh ok thanks.
 

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