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Hi, I modelled a 2-story 2-bay frame with fiber section. I used ''recorder'' command in order to understand how stiffness of fiber sections changes during nonlinear time history analysis. However, the result file consists of 4 columns and I could not understand the results. Please, can you explain t...

Hi, I modelled cantilever column by using fiber section. I obtained period of the structure with ''eigen'' command. Also, I obtained global stiffness matrix after static analysis with ''printA'' command. After that, I performed nonlinear dynamic analysis and obtained again period with ''eigen'' comm...