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Class Exercise #13 1.050 Solid Mechanics The truss shown has a stiffness matrix [K] which is a 22 by 22 matrix if we eliminate the elements associated with displacements of the two points, 12 and 13, ﬁxed at the wall. 12 10 8 6 4 2 3a 13 11 9 4a 4a 4a 7 5 3 ..................................... 1 W What are the elements of the two columns corresponding to the displacement components, u6 and v6? u6 v6 X4 Y4 X5 Y5 X6 Y6 X7 Y7 X8 Y8 Class Exercise #13 10/19/04 LL Bucciarelli