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SAP2000 Giving me incorrect period for simple rocking structure?

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Omar-Bridge

Structural
Joined
Oct 30, 2017
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Location
AU
I have Produced a simple rocking column pilot model using SAP2000 and am getting an extremely large period which is incorrect. I have attached the model to this forum. The foundation is 6mx6m and the height and diameter of the column is 12m and 2.5m. I dont understand why I am getting a period of 50000 seconds and there are still large forces being transfered to the structure during an earthquake excitation. I believe the mass used in the modal participation is correct.
 
 http://files.engineering.com/getfile.aspx?folder=242dff68-1624-4adc-b8cb-7971d380f255&file=PT2-Rocking.sdb
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