Truss Analysis: Finding Forces in Marked Members - Homework Problem

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SUMMARY

The discussion focuses on solving a truss analysis problem to find the forces in marked members of a truss structure. The initial step involves calculating the support reactions, which is essential for determining the forces in the members. The recommended approach includes finding the lengths of the members and the angles between them, particularly starting with node G using the equations G[y]=0= -20 + EG[y] and G[x]=0= -20 + FG + EG[x]. This structured method simplifies the process of analyzing the truss system.

PREREQUISITES
  • Understanding of truss analysis principles
  • Knowledge of static equilibrium conditions
  • Familiarity with calculating support reactions
  • Ability to apply geometry in determining member lengths and angles
NEXT STEPS
  • Study the method of joints in truss analysis
  • Learn how to calculate member forces using the method of sections
  • Explore the use of Free Body Diagrams (FBD) in structural analysis
  • Investigate software tools for truss analysis simulations
USEFUL FOR

Students studying structural engineering, civil engineering professionals, and anyone involved in analyzing truss systems for construction projects.

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Homework Statement


Here is a link to a picture of the problem
http://img571.imageshack.us/img571/374/truss.jpg"
I have to find the forces in the members marked with an x.
2. The attempt at a solution
I found the support reactions, but I'm not sure if I need them. Should I try to find the lengths of the members and the angles between them next?

truss analysis*
 
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It is always best to find the joint reactions first. Then whether you solve for the member forces by joints or sections, you yes need the angles/lengths
 
If you are still having trouble, try to solve node G using these:
G[y]=0= -20 + EG[y]
and
G[x]=0= -20 + FG + EG[x].
Then it should be easy enough to start working your way down.
 

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