If you want to find the horizontal component of force, you use the horizontal component of the triangle( the base) over the hypotenuse and if you want to find the vertical component of the force you multiply the magnitude of the force by the height of triangle over hypotenuse
considering the entire structure, there is no other support reaction that can counter Ax. By inspection then, if the object is not to accelerate (which would be bad), Ax must be equal to zero. Remember, if a truss is in equilibrium, then so are its members.
Why is HB in compression and GB in tension, and not the other way around? If I do the equation with HB in tension and GB in compression I still get zero sum for point B. This is why I hate learning statics through method of sections.
Before solving the problem, we do not know the direction of forces, so we assume all members are in tension and if we get a negative value after solving our equilibrium equations, that means, the tension direction we assumed is incorrect, and the member is in tension. Member HG is in compression, because we get a negative value for it. Your truss will NOT be in equilibrium with incorrect force direction. Hate is a strong word, if you are struggling, that means there is a learning curve in front of you. Confusion is the first step in learning
How is Ay both 8 and 9.5?
The value for At is 9.5 as calculated. The value of 8 is a typo. 9.5 is used in all calculations.
THANK YOU!!!
You are welcome!
I am glad you found it helpful!
Which college do you go to?
When you are doing your moments, how are you choosing between the horizontal and vertical componets of the triangle and why?
If you want to find the horizontal component of force, you use the horizontal component of the triangle( the base) over the hypotenuse and if you want to find the vertical component of the force you multiply the magnitude of the force by the height of triangle over hypotenuse
For moment B when doing FHG why is the moment arm half of 3? Why is it not 3?
Hi, because point H is half way between point A and point G, the height of point G is 3 meter, so the height of point H would be 1.5 meter.
why is there no Ax? i thought it was pin supported?
considering the entire structure, there is no other support reaction that can counter Ax. By inspection then, if the object is not to accelerate (which would be bad), Ax must be equal to zero. Remember, if a truss is in equilibrium, then so are its members.
For Ma, why is F(HG) not considered?
Because the moment arm is zero. Or in other words, force FG is going through point A.
Why is HB in compression and GB in tension, and not the other way around? If I do the equation with HB in tension and GB in compression I still get zero sum for point B. This is why I hate learning statics through method of sections.
Before solving the problem, we do not know the direction of forces, so we assume all members are in tension and if we get a negative value after solving our equilibrium equations, that means, the tension direction we assumed is incorrect, and the member is in tension. Member HG is in compression, because we get a negative value for it. Your truss will NOT be in equilibrium with incorrect force direction.
Hate is a strong word, if you are struggling, that means there is a learning curve in front of you. Confusion is the first step in learning