- #1
phiby
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I have gone through Beam Element analysis in several books on FEA. 80% of books have a particular Stiffness matrix, while a very small number of books have a matrix which is subtly different in sign.
http://www.flickr.com/photos/66943862@N06/7195680680/in/photostream/lightbox
Most books have the 2nd matrix in the photo above.
A couple of books have 1st one.
Likewise the loading matrix is also slightly different.
Corresponding to the first one, the loading matrix is F*L/12 [ 6 -L 6 L]T
While the majority have F*L/12 [ 6 L 6 -L]TWhich method is correct?
http://www.flickr.com/photos/66943862@N06/7195680680/in/photostream/lightbox
Most books have the 2nd matrix in the photo above.
A couple of books have 1st one.
Likewise the loading matrix is also slightly different.
Corresponding to the first one, the loading matrix is F*L/12 [ 6 -L 6 L]T
While the majority have F*L/12 [ 6 L 6 -L]TWhich method is correct?
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