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

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Discussion Overview

The discussion revolves around identifying zero force members in a truss structure using the method of joints. Participants are exploring the criteria for determining these members and analyzing the forces acting on the joints.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant expresses difficulty in identifying zero force members and seeks assistance in applying the method of joints.
  • Another participant asserts that there are no zero-force members in the truss and prompts others to review the criteria for identifying them.
  • A different participant agrees that there may not be zero-force members but questions the role of member HI in relation to the forces at joint I and member BC.
  • One participant states definitively that there are no zero force members for the given load arrangement, noting that member JD would only be a zero force member if there were no load at point D.
  • This participant emphasizes the need for equilibrium at each end of member BI, suggesting that HI and BC are balancing forces at their respective joints.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the presence of zero force members, with some asserting their absence while others question specific members' roles in the truss.

Contextual Notes

Participants reference criteria for identifying zero force members but do not detail these criteria, leaving assumptions about their application unresolved.

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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