Gergana, you can assign joint displacements at restraint or spring locations, and then Define time history cases using TH functions based on your accelerogram data to be applied using those displacement loads.
Export from Autodesk Revit to create a new model in Etabs, Sap2000 or Safe. With CSixRevit we can perform 4 types of data exchange. SAP lets you apply a sine and/or cosine TH functions to any joint, distributed load, or thermal loads Description CSixRevit 2022.1 is a plugin or add-on that allows the exchange of information between Autodesk Revit and CSI products (Sap2000, Etabs and Safe). You define TH sine functions as described above. Then define your Time History analysis case using the load case(s) which you just assigned. which will later be the basis for your sinusoidal time history analysis. Option 2 (without bridge module) - Define static joint or distributed loads to your model for your vehicle loads. The benefit of the moving load case is that without it, you have to define your vehicle loads manually using joint loads or distributed loads You should be good to go with that procedure. After you've defined it/them, go back to your Time History analysis case and change the default TH function to a sinusoidal function which you just defined.
Now go to Define menu>Functions>Time History, and you'll see that SAP has some automated tools for you to define sinusoidal functions. Go ahead and do that using the default time history function for the time being. SAP will then use that multi-step static case as the basis for the time history case. When you do that, you'll see an option under the Loads applied for your multi-step static case (although the default is DEAD) which you will need to choose. Now go to Define>Analysis case and add a new load Time history type. Option 1 (valid only if you have access to the bridge module): Define a bridge load moving load case, and after you've done that, go to Define>Load cases and define a new load case type "Bridge live", which is a multi-step static load case in which you can use vehicles defined in your bridge load case.
271828, you've got two options, depending on whether or not your company owns the SAP bridge module.