Element h

6/L 4 symmetric

The structural stiffness matrix can now be assembled. A dof. correspondence table can be used as an aid to assembly. However, observation of the relatively simple element connectivity, shows that the stiffness contributions for element a will occupy the upper left 4x4 locations, whilst those for element b will occupy the lower right 4x4 locations of the 6 x 6 structural stiffness matrix. The reduced structural stiffness matrix is due to the omission of axial terms, otherwise the matrix would have been of order 9x9. Hence, completing only those columns needed for the solution, gives

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