Hi Solmaz,
You can develop a Max load case instead of providing load on individual operating cases. In my experience individual load case sometimes confuses civil guys. As a standard practice following load cases are sufficient enough to design structure/pavement.
1. Hydro Load
2. Empty Load
3. Max Ope (OPE+SUS)
4. Max Occ
Regards,
Naren
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Regards,
Narendra Singh
Pipe Stress Engineer
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Everything has some flexibility