The Direct Stiffness Method
It is common to have Eq.(1) in a form where and are, respectively, the member-end displacements and forces matching in direction with r and R. In such case, and can be obtained by direct summation of the members' matrices and . The method is then known as the direct stiffness method.
The advantages and disadvantages of the matrix stiffness method are compared and discussed in the flexibility method article.
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