If 0.8% is the min. Steel required for column as per IS 456 HOw staad is giving Ast required as less than 0.8% of column size?
i have a question regarding how staad will calculate the % of steel in column as you gave clarification related to less then 0.8% where is the validation example for more then 0.8% of steel
The clause you are referring to has an exception written in the notes.
For this clause the area of reinforcement may be less than 0.8% in some cases. Please do a hand calculation and check if that is the issue.
Also i would suggest using the Advanced concrete design workflow for concrete design as it is more convenient and have all the controls like minimum reinf, automatic effective length factor calculation, P-M interaction curve generation etc,. Refer below link to know more.
https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/31797/staad-advanced-concrete-design-rcdc