It is made of the member stiffness influence coefficients, k’ ij K’ = member stiffness matrix which is of the same form as each member of the truss. Without much attention to the derivation, the stiffness matrix is given by The aim of this is to simplify the arrangement of the structure’s stiffness matrix.Ĭomputation of member global stiffness matrix Also notice that the unconstrained degrees of freedom have labelled first. The members have also been labelled accordingly with their numbers enclosed in a box (see figure above). The displacements are the horizontal and vertical translations which have been labelled from 1 – 4 and represented by the arrow heads at those nodes. For the truss that is loaded as shown above, there are four unconstrained degrees of freedom which occur at nodes ② and ③.
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