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(3) Run time history analysis with a load applied at time = 0. The load would be opposite to that applied in step 2 and it would effectively simulate removing the column. You would need to use a ramp function to reduce the loads applied in the time history analysis to zero values in a short time. How short (or long) the time should be would depend on how quickly the column is removed and you should use your judgment to decide this.
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References
- Analytical Tools for Progressive Collapse Analysis by Robert Smilowitz
- Dynamic Analysis Procedure for Progressive Collapse by Elizabeth Agnew, and Shalva Marjanishvili; STRUCTURE Magazine, April 2006 - provides some SAP2000 specific information