Try calling their tech service, they should be able to resolve those issues, or may show some kind of "go-arround" tricks to get a similar result.
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Thanks,Milo Zabala
Hi,In SAP2000 software in assigning area spring to shell elements, there are available both "tension-compression" and "compression-only" springs, But even if "compression-only" is selected, in output results, tension is developed in springs. I don't know how we can model and analyze compression only springs to exactly model the soil-foundation contact situation.Regards,
Hossein Mardanlo