Truss Analysis: Solving for Zero Force Members using Method of Joints

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SUMMARY

The discussion focuses on identifying zero force members in a truss using the method of joints. Participants emphasize the importance of understanding the criteria for zero force members, particularly in the context of the provided truss structure. It is concluded that, under the current load arrangement, there are no zero force members present, as each member contributes to the equilibrium of the joints involved. The analysis highlights the necessity of evaluating forces at each joint to determine the role of each member accurately.

PREREQUISITES
  • Understanding of truss structures and their components
  • Familiarity with the method of joints in structural analysis
  • Knowledge of equilibrium conditions in static systems
  • Ability to analyze forces acting on joints in a truss
NEXT STEPS
  • Study the criteria for identifying zero force members in trusses
  • Practice solving truss problems using the method of joints
  • Explore examples of trusses with known zero force members
  • Learn about the implications of load arrangements on member forces
USEFUL FOR

Structural engineers, civil engineering students, and anyone involved in analyzing truss systems will benefit from this discussion, particularly those looking to enhance their understanding of force distribution and equilibrium in trusses.

VooDoo
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Hi Guys,

I am having trouble determining the zero force members in the truss below. I am planing to use the method of joints to solve for the forces in the beams. So if I knew the zero force members it would be easy.
 

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I don't believe there are any zero-force members in that truss.

Do you know the criteria to look for when determining zero force members? Go through the truss and see if any of the joints meet the criteria.
 
Last edited:
dav2008 said:
I don't believe there are any zero-force members in that truss.

Do you know the criteria to look for when determining zero force members? Go through the truss and see if any of the joints meet the criteria.
That is what I thought as well. But then if you look at it this way:

The horizontal component of the force in member BI is conteracted by the horizontal force BC. Therefore what is the force HI doing?
 
There are no zero force members for this load arrangement. JD would be a zero force member if there was not a load applied at D.

There has to be equilibrium at each end of member BI. HI is balancing joint I and BC is working to balance joint B
 

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