Bar forces (1-6) should be calculated?

[Dan123]

Homework Statement

The pictue shows a symmetrical framework. I should calculate the bar forces. and make a "Clear Cut".I*m not shure because of the left movable bearing (on the left side)!?

Homework Equations

total x=0
total y=0
total M=0

The Attempt at a Solution

Here is my "Clear Cut" is it correctly?

 

[haruspex]

You are right that the force at lower left acts at 45 degrees, but do you think it acts up or down on the frame?

 

[Dan123]

You are right that the force at lower left acts at 45 degrees, but do you think it acts up or down on the frame?

I'm not shure, but our professor said, we should just set it in one direction, and after we calculate it we can see which the right direction was (if it is negative, we have to switch the direction).

But do you know, how I can solve this ...? I'm not shure

 

[Dan123]

Homework Statement

The pictue shows a symmetrical framework. I should calculate the bar forces. and make a "Clear Cut".I*m not shure because of the left movable bearing (on the left side)!?

View attachment 218785

Homework Equations

total x=0
total y=0
total M=0

The Attempt at a Solution

Here is my "Clear Cut" is it correctly?

View attachment 218786

i forgot...there is given

F, h, F1=2F and F2=3F

 

[haruspex]

our professor said, we should just set it in one direction, and after we calculate it we can see which the right direction was (if it is negative, we have to switch the direction).

That's correct, but it seemed you were asking for comments on your diagram.

how I can solve this

That's not what you asked originally. As per forum rules you need to show an attempt at a solution. Apply the relevant equations you quoted.

 

[Dan123]

That's correct, but it seemed you were asking for comments on your diagram.

That's not what you asked originally. As per forum rules you need to show an attempt at a solution. Apply the relevant equations you quoted.

ok, I will send my solution...or my try :)

 

[Dan123]

That's correct, but it seemed you were asking for comments on your diagram.

That's not what you asked originally. As per forum rules you need to show an attempt at a solution. Apply the relevant equations you quoted.

So here is my try...I can't finish it...I don't get the right answer (the right answer is: S1=6F ; S2=(√5)/2 F ; S3=1,5F ; S4=7F ; S5=(√5)/2 F ; S6=1,5F )

I thought of dividing it in two parts (special calculation method...?!

Could you pplease help me :)

 

[haruspex]

(the right answer is: S1=6F ; S2=(√5)/2 F ; S3=1,5F )

Doesn't look right to me.
I was suspicious that you may have specified the wrong values for the applied forces, so I made them arbitrary.
Consider the leftmost triangle and take moments about its lower right corner. Let N be the normal force from the lower left support, Gt the downward load at the top of the triangle, and Gr the load at the bottom right.
Take members 1 and 2 to be under compression, 3 under tension.
Y: N/√2-2S₂/√5=Gr+Gt
X: N/√2=S₂/√5-S₃+S₁
M: N/√2=Gt/2+S₁
If I substitute the answers in the X and M equations I get N=5F√2, Gt=-F.