Zero-force members prevent a truss from becoming a mechanism -- Why?

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Discussion Overview

The discussion centers around the role of zero-force members in truss structures, specifically addressing their function in preventing a truss from becoming a mechanism. Participants explore the implications of this concept and seek clarification on the terminology and underlying principles.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant states that zero-force members increase the stability of a truss during construction and provide support if loading changes, but seeks clarification on how they prevent the structure from becoming a mechanism.
  • Another participant suggests that understanding the term "mechanism" is essential to answering the original question.
  • A third participant questions whether the concept relates to racking, indicating a potential misunderstanding of the term "mechanism."
  • A later reply challenges the understanding of "mechanism" in engineering, implying that further research is necessary for clarity.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the definition of "mechanism" or the implications of zero-force members, indicating that multiple competing views and uncertainties remain in the discussion.

Contextual Notes

Some participants express a lack of clarity regarding the definition of "mechanism" in the context of engineering, which may affect their understanding of the role of zero-force members.

JakeMEng
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My professor explained to us that the purpose of a zero-force member in a truss is to increase the stability of the truss during construction, to provide added support if the loading is changed and to prevent the structure from becoming a mechanism.

It is this latter point that I do not understand the meaning of. What does it mean for a structure to become a mechanism? Why is this unwanted? Why does a zero-force member prevent this?

Thank you
 
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You should get all your answers from the definition of "mechanism".
 
Is it like racking?
 

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