Why doesn't pin C have a y component if pins A and C are identical?

[fayan77]

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

 

[mfb]

Pin A and C are the same

They are not.

How would the beam at C transfer a vertical component?

 

[fayan77]

they are tho, they look exactly the same. why is it that c does not provide a vertical force?

 

[PhanthomJay]

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?

 

[pongo38]

In order for there to be a vertical component of reaction at C, member CD would have to be inclined rather than horizontal..