Hello Aravind
My first idea would be to divide the surface into smaller strips that can then be loaded with a surface load. You can then activate a variable load for this load. This workflow discretizes the variable load. The thinner the strips, the better the load approximates the specified load.
Here is a quick example visualising my proposed workflow:
Radiale Last.sofistik (46.7 KB)
Radiale Last.dwg (73.4 KB)
Best regards
Frederik Höller
Your SOFiSTiK Support Team