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create arbitary boundary condition

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Normally for a fixed - free beam, we was constraining all freedoms (T and R) at fixed end

I want to use spring at fixed end instead of constraining all freedoms in order to agree experimental modal results

what I want that

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Hi,

 

You can use CELAS or CBUSH element which will be fixed at one end and provide stiffness to the spring in the desired direction. 

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