Dear All,
Has anyone of you implemented 3D truss element (or 2D) within the
framework of GetFEM++? Not that this element is any special --
I could calculate its stiffness matrix explicitly and use generic
assembly routines. However I have problems if figuring out if there
is some sort of support in GetFEM for "structural elements" as I call them.
To be more explicit: one usually defines the truss element in
local coordinate system that reduces the problem to 1D.
Then in case of 2D one uses the transformation matrix:
T = [ c s 0 0
0 0 c s ] c -- cosine between local and global X axis
s -- sine between local and global X axis
that transforms global degree of freedom Q_i (2 per node) into the
local one.
Of course element stiffness matrix in global coordinate system boils down
to :
E*A * T' * [1,-1;-1,1] * T where E*A is the bar stiffness.
The question essentially is -- what is the most "GetFEMic" way of handling
the matrix T?
Regards
Roman
--
Roman Putanowicz, PhD < [email protected] >
Institute for Computational Civil Engng (L-5)
Dept. of Civil Engng, Cracow Univ. of Technology
www.l5.pk.edu.pl, tel. +48 12 628 2569, fax 2034
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