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Hey there, i am stuck on this question in my past exam paper, and i have tried many ways of doing it but just simply not getting any where !!

So please would u mind helping me out a little here !!??

A rectangular cross section hollow steel tube (outer diameter 50 mm and 65 mm) is to be used as a strut. In initial designs the ends of the strut are held in position but not restrained against rotation. The distance between the restraints is 2m, and the load it has to carry is 180kN.

(a) The wallthickness is 4mm. Is the design safe? (you may assume Euler's buckling theory is valid) (v = 0.3, E=205GPa for steel; sigmaY = 250MPa)

(b) The tube is now restrained against rotation at one end while being pinned at the other. Find the maxiumum allowable load using both Euler and AISC formula (given below). Fully explain design process.

NOTE: The AISC rules state for L/K (effective length / radius of gyration) values less than (L/K)c, where (L/K)c = squareroot {(2*pi^2*E)/(SigmaY)} plot the parabolic curve: sigma = sigmaY*{1-((L/K)^2)/(2*(L/K)c)}

Smoothly join this parabola into the Euler curve for L/k values greater than (L/K)c.

Here is the question, sorry it is a bit long, but i just dont know where to start lol !!

Thanks !!

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# Revision on Past Exam Paper

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