Truss compression and tension forces help

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SUMMARY

The discussion focuses on analyzing the forces in a space truss system, specifically identifying the unknown forces F1, F2, and F3 when subjected to a 10kN force F. The participants emphasize the importance of summing the forces in the x, y, and z directions to solve for the unknowns. A critical point raised is the lack of a reaction force for F1, which complicates the analysis. Additionally, the need for a force at the wall level of F3 to prevent structural failure is highlighted.

PREREQUISITES
  • Understanding of static equilibrium principles in truss analysis
  • Familiarity with vector decomposition in three dimensions
  • Knowledge of force summation in structural engineering
  • Basic skills in drawing and interpreting free body diagrams
NEXT STEPS
  • Study the method of joints in truss analysis
  • Learn about the role of reaction forces in static structures
  • Explore 3D vector analysis techniques for force resolution
  • Investigate software tools for structural analysis, such as SAP2000 or ANSYS
USEFUL FOR

Structural engineers, civil engineering students, and professionals involved in truss design and analysis will benefit from this discussion.

gozita73
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The space truss showin has compression and tension forces acting in the members as shown.

t6pfg1.png


Force F is 10kN, determine the three unknown forces (F1, F2 and F3).


I know that it should be the summation of Fx, Fy and Fz, however for F1, there is no reaction force, so I don't know what to do.

Can somebody please help?
 
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Attach A & B to a vertical wall.
What force is needed directly on the wall at the level of F3 to stop the wall from being pulled over by F.
 
so the x component of F1 would be supported by the wall??
 
bump ?
 
gozita73 said:
so the x component of F1 would be supported by the wall??
I'm not too good looking at 3D, but something appears wrong with your picture. There appears to be no way for the x component of the F1 force to be balanced at the joint, since the other 3 members all lie in the yz plane, unless the picture is misleading or incomplete?
 

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