Statics: Tension or Compression?

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Discussion Overview

The discussion revolves around identifying whether a structural member is experiencing tension or compression. Participants explore methods for determining the state of the member, including visual analysis and calculations, while expressing varying levels of confidence in their approaches.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that visual analysis can aid in determining whether a member is under tension or compression.
  • Others propose that calculations can definitively indicate the state of the member, although they acknowledge that intuition and rough analysis may sometimes suffice.
  • A participant expresses difficulty specifically with identifying tension or compression in free body diagrams (FBDs), despite feeling comfortable with calculations.
  • Another participant notes that the calculations will yield positive or negative values, implying that prior knowledge of the member's state is not necessary for the analysis.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method for determining tension or compression, as there are multiple approaches discussed and varying levels of confidence expressed.

Contextual Notes

There are indications of uncertainty regarding the application of intuition versus calculation, as well as the interpretation of free body diagrams in this context.

Elfrid Payton
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When examining a member, how do I tell whether it is undergoing tension or compression?

It's more of a general question, but since a visual might help with the explanation, this could be useful:

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Elfrid Payton said:
When examining a member, how do I tell whether it is undergoing tension or compression?
You can calculate it.
Sometimes intuition and some rough analysis are sufficient, sometimes they are not.
 
mfb said:
You can calculate it.
Sometimes intuition and some rough analysis are sufficient, sometimes they are not.

The calculations are not the problem. Figuring out whether the members are undergoing tension or compression for the FBDs is what I'm having trouble with.
 
The calculations will give you negative or positive values. There is no need to know that in advance.
 

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