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Stacking of DOFs in Abaqus

I am studying the response of a bridge in MATLAB, and have successfully retrieved mass and stiffness matrices from Abaqus using the following keywords:

 

*Step

*Matrix generate, STIFFNESS, MASS

*Matrix output, STIFFNESS, MASS, FORMAT=COORDINATE

*End step 

 

This gives matrices on a mathematical form, very well suited for use with MATLAB. 

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