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Buckling of composite shapes on ductwork

Buckling of composite shapes on ductwork

Buckling of composite shapes on ductwork

(OP)
I need a simplified (conservative) method of checking existing stiffened ductwork, mainly in compression loading, while in the field.
I have read through "The Structural Design of Air and Gas Ducts for Power Stations and Industrial Boiler Applications" section 8.2 on rectangular ducts and the composite sections of stiffeners and plates.

This seems to be the same basic concept of stiffeners on pressure vessels, using the stiffener plus a length of the shell to form a composite shape.

My question is after the properties of this composite shape are found would it be reasonable find the KL/r of the particular stiffener, use table 4-22 of the SCM to find the allowable stress (ksi), convert this to a load (kips), and compare that to my expected loading?

Thanks for the help.

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