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Construction of a global stiffness matrix


k1 N2 N3 N4 k2 N5 F 5 N1 ka ka kb kb
          
k1 -k1 0 0 0
-k1 0 0 0 0
0 0 0 0 0
0 0 0 0 -k2
0 0 0 -k2 k2
You must have at least one spring on each side.
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