Design capacity tablr

[PKOM]

Hi, can anyone help to explain how to read this table. The design capacity MB, MCY and Critical load etc. I'm currently stuck when the member fail. I cannot explain why it fail based on this. Please help. Thank you

 

[SethGuthrie]

It fails because the moment demand MZ is 349 kN-m, but the moment capacity is only 268, hence a DCR of 1.3. (the axial demand and MY are both small)