Critical local buckling stress of protruded RHS sections

For this work, it should be concise, clear, and use only short or medium sentences. Do not use too long sentences. It should be robust and summarize exactly

the main ideas of section 4.2 ELASTIC LOCAL BUCKLING OF FLAT PLATES and 4.2.1 Uniform Compression
And 4.2.2 Compression and Bending only(Page. 130,131.132,133)
you need to use all the equations and the figs. In those section. Everything must be paraphrased except the technical engineering words. I need you to put

many references to support the idea.

This is the link of the book
https://www.academia.edu/40386544/Guide_to_Stability_Design_Criteria_for_Metal_Structures

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