Progressive collapse analysis
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FAQ
How can I perform progressive collapse analysis (e.g. remove column and get dynamic response) in SAP2000?
You can simulate the progressive collapse analysis with dynamic effects by running time history analysis as follows:
(1) Create "Model A" that contains the entire structure, including the column to be removed. Analyze Model A to obtain internal forces for the column to be removed.
(2) Create a "Model B" that does not contain the column to be removed. However, simulate the presence of column to be removed by applying end column forces obtained from Model A to the appropriate joints of the model.
(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.
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
| Time History Analysis e | |
| Topic | Overview · Tips · FAQ |
| Analysis Types | Nonlinear modal time history analysis (Fast Nonlinear Analysis, FNA) |
| Miscellaneous | Progressive collapse analysis · Comparison of FNA and direct integration |
| Related Categories | Time History Analysis |
