Internal Forces in Truss: Solving for AB at Point A and Point B

[fonseh]

Homework Statement

For this problem , i found that the internal force AB at point A and point B pointed in the same direction ( as shown) in my working , so , how they cancel off each other ?Since they can't cancel off each other , so they are not stable , right ? The structure is statically indeterminate ?

Homework Equations

The Attempt at a Solution

It's in the 3rd photo [/B]

 

[PhanthomJay]

you forgot to consider the horizontal force reaction.

 

[fonseh]

which

you forgot to consider the horizontal force reaction.

one ? which part ? Can you point out ?

 

[PhanthomJay]

see your first attachment , bottom of page, sum of forces in x direction = 0.

 

[fonseh]

One more question here , how to get the value of µ ? It's not stated in my textbook what is it ... And what is the usage of µ ?