The reason for failure is either slenderness or combined interaction. For slenderness check, as you have not specified any parameter (MAIN and TMAIN), program considers the default value. You can change the slenderness limit by specifying MAIN and TMAIN parameter according to Table 3 of IS800:2007 code. You can also bypass the check using MAIN 1 and TMAIN 1 parameter. Else you need to increase the section size or decrease the effective length of the member.
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