Pin A & C: Why No Y Component in Solution Manual?

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Discussion Overview

The discussion centers around the behavior of pinned joints A and C in a structural analysis problem, specifically questioning why the solution manual indicates that joint C does not have a vertical (y) component of force. The scope includes theoretical considerations of forces in structural mechanics.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant asserts that pins A and C are identical, questioning why C lacks a vertical force component.
  • Another participant challenges this view, suggesting that the beam at C cannot transfer a vertical component.
  • A repeated assertion emphasizes that both joints are pinned and should theoretically support vertical forces, yet claims that no vertical force exists at C in this specific problem.
  • It is proposed that for a vertical reaction at C to exist, member CD would need to be inclined rather than horizontal.

Areas of Agreement / Disagreement

Participants express disagreement regarding the presence of a vertical force at joint C, with differing interpretations of the mechanics involved.

Contextual Notes

There are unresolved assumptions regarding the configuration of member CD and its implications for force transfer at joint C.

fayan77
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Homework Statement


Pin A and C are the same, however in the solution manual it shows that C does not have a y component. Why is that?

Homework Equations

The Attempt at a Solution

 

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fayan77 said:
Pin A and C are the same
They are not.

How would the beam at C transfer a vertical component?
 
they are tho, they look exactly the same. why is it that c does not provide a vertical force?
 
fayan77 said:
they are tho, they look exactly the same. why is it that c does not provide a vertical force?
They are both pinned joints capable of taking forces in both the vertical and horizontal direction, but in this problem, no vertical force exists at C. You should attempt to answer the question asked by @mfb. What do you know about truss members with forces applied at joints?
 
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In order for there to be a vertical component of reaction at C, member CD would have to be inclined rather than horizontal..
 

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