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Effective Length Factors

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Dear Waterman Drinkwater and others:

There have been some recent posts about the use of
FEM modeling programs to determine effective length
factors.  I would like to know the method employed
by these programs (such as STAAD Pro); is the
consistent geometric stiffness matrix used?  I doubt 
that classical stability methods (Euler's equations of 
neutral equilibirum) are being employed.

Thank you, 

Rafael Sabelli