This problem is relatively easy solved when stiffeners are identical and obeying rotational Hooke's law, i.e., are linear. The case of different but comparable with each other stiffeness coefficients is very cumbersome and it demands solving a system of transcendental equations to get a critical load even in Euler'sregime.
I've failed in searching the solution of this problem in scientific and educational literature however I don't like "to invent a bike". May be anybody has some references on this problem or even an article or book chapter.
The way I solve this problrm see the paper "Buckling in inelastic regime of a uniform console with symmetrical cross section: computer modeling by the use of Maple 18" on my profile.
Thanx everybody in advance
Best regards
Viktor
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