Forces on Equilateral triangle truss

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SUMMARY

The discussion centers on analyzing forces in an equilateral triangle truss with each side length denoted as 'l'. A horizontal force 'F' is applied at the apex of the triangle. Participants calculated moments at the supports, concluding that the moments are (½)F. The force in member AD was determined to be equal to F, while member AB was found to have zero force, prompting questions about the accuracy of these findings.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Familiarity with truss analysis techniques
  • Knowledge of force decomposition in two dimensions
  • Basic concepts of moment calculations
NEXT STEPS
  • Study methods for analyzing truss structures using the method of joints
  • Learn about calculating forces in trusses using the method of sections
  • Explore the implications of zero-force members in truss design
  • Review examples of moment calculations in static structures
USEFUL FOR

Engineering students, structural engineers, and professionals involved in truss design and analysis will benefit from this discussion.

tom676
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Hey Guys,

My question involves finding all of the forces acting upon each member. It is known that each side of the triangle has a length of l. It is also known that the force is acting at the very top of the triangle in the x direction (to the right) labelled as F.

Attempt:
I found moments at both supports (bottom left + bottom right) to be (½)F. I have found that AD = F and for some reason AB = 0?

Is this incorrect?
 
Last edited:
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How about showing the work you have done so we can see how you are thinking? That would help a lot.
 

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