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problem about total lagrangian beam element (Timoshenko type) programming

For some reason, I am writing a finite element program using the Timoshenko beam element and Total Lagrangian Formulation for geometric nonlinear analysis.

 

But I fail to get correct results with my program. I am suspecting the problem may be caused by the use of non-vector rotational variables.

 

I don't know how to insert equations, so I enclose the file with the description of the problem.

 

Anyone can help would be greatly appreciated.

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