How to add command PERFORM ANALYSIS and CHANGE while using Physical Modeler seismic analysis?
If the static seismic case is to be used in a tension/compression analysis, then each seismic case should be followed by PERFORM ANALYSIS then CHANGE commands in STAAD's input file. This is a general requirement for STAAD.Pro models which can be easily satisfied by using the Input Editor or GUI in the Analytical Modeler. To satisfy this requirement in the Physical Modeler, the following workflow should be used:
1) Make sure that static seismic load cases are created in the Physical Modeler;2) Go to Loading -> Analysis Commands:
3) In the opened dialog, several Analysis Set need to be created. After each Analysis Set, the program will automatically add the PERFORM ANALYSIS and CHANGE commands into the input file when converting the Physical Model into the Analytical. In the screenshot below, the first Analysis Set (EQX) was created and only Seismic X load case was added to it. The second Analysis Set (EQZ) was created for the Seismic Z load case. After each set, the PERFORM ANALYSIS and CHANGE commands will be added automatically. Finally, the third analysis set was created for all other Load Cases, like Dead, Live, etc:
4) Once the model is transferred from Physical to Analytical Modeler, such input file will be generated: