An elasto-plastic method (EPM) for advanced buckling analysis of stiffened panels is proposed based on elastic large deflection theory and rigid plastic method considering initial imperfections, combined biaxial compression and lateral loads, and also five collapse modes. Comparative calculation on serial test models is conducted to verify the precision of EPM. Biaxial stress capacity curves of four typical stiffened panels are calculated using EPM and comparative analysis with the results of both PULS software and harmonized common structural rules (HCSR) method is also conducted. The results obtained indicate that EPM is able to address the effects of various factors including combined loading affecting the ultimate strength of stiffened panels.

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