pyNastran
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add shear center calculation
PBARL/PBEAML have a shear center. Calculate it.
The shear center should be relative to some easily calculated point (e.g., half the height for an I beam or the bottom of a C beam). This is ultimately to aide in the calculation of 3D beams, so only the more complicated ones need this calculation (e.g,, a T or L does not).