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How to eliminate tension springs in SAP2000

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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