Why Is Joint IH Classified as Tension?

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SUMMARY

The discussion focuses on the classification of joint IH as being in tension rather than compression. The user questions the reasoning behind this classification, suggesting that the horizontal force exerted by the pin should indicate compression. However, the analysis reveals that joint IH is indeed in tension due to the structural dynamics at play, particularly the pivoting effect around point A. The user also compares this with joint AB, which is in compression, and joint AH, which is in tension.

PREREQUISITES
  • Understanding of static equilibrium principles, specifically the sum of forces being zero.
  • Knowledge of joint force analysis in truss structures.
  • Familiarity with tension and compression concepts in structural engineering.
  • Basic experience with physical modeling techniques, such as using straws and blue-tack.
NEXT STEPS
  • Study the principles of static equilibrium in truss analysis.
  • Learn about the methods for analyzing forces in truss joints, such as the method of joints.
  • Explore the effects of pivot points in structural systems.
  • Experiment with physical models to visualize tension and compression in structures.
USEFUL FOR

Students of structural engineering, civil engineering practitioners, and anyone involved in analyzing forces in truss systems will benefit from this discussion.

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Homework Statement



Determine whether each joint is in tension or compression

(correct answers on the image)

2450jnt.png


Homework Equations



sum of force = 0

The Attempt at a Solution



On Joint I, I don't understand why IH is in tension. The pin is exerting a horizontal force and therefore IH should be in compression to oppose the Joint force. This should be the same for Joint IA right since the pin is also exertng a vertical force?

If we look at Joint A, this logic (sorta) makes sense. The roller joint is exerting only a horizontal force and therefore Joint AB must be in compression to oppose this force.. but then there's joint AH which should be in tension to oppose Joint AB...

Any help would be soo great
 
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Build the stricture with drinking straws and blue-tack as see what happens.
As it sits, the whole structure wants to pivot about point A right? (Well, if we hold A.)
So that means that IH is being pulled away from I.
 
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NoobeAtPhysics said:
The pin is exerting a horizontal force
Sure, but which way?
 
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