Yes, it is homework. However, I am given this equation and I see it for the first time, so I don't know if its wrong, but should be correct...
And I cannot change the material. Trying with longer member did not give any changes in regards of buckling.
The force loaded on diagonal is -18kN (compression).
Fbuckling = (k * pi^2 * E * I)/ L^2
k=0.6
E=70kN/mm^2
I=10x10^4 mm^4
L=5.54 m.
The maximum possible load of the member is therefore less than the current one. For this reason the structure will fail..
I don't know how to position the members so that they could support the load - that no member would be buckled.
The triangle does not work as the hypotenuse is being buckled, and I need to attach new members but I cannot think of anything else than I showed. That's the reason I'm writing here.
I agree now. I was badly confused with the truss analysis software where I could only enter approximate values and therefore got wrong result.
However, how could I set the bars so that the framework would support that load without buckling in the B member?
I have tried all the following and...
Briefly, I need to design a framework which would support a plug which is used to fill in the hole in water tank, 4.8m above the ground. In other words, 10.69kN load at angle of 30 degrees is therefore applied to the framework.
So I came up with my design. The problem is that I get zero value...