Solution
The system stiffness matrix K is square since the vectors R and r have the same size. In addition, it is symmetric because is symmetric. Once the supports' constraints are accounted for in (2), the nodal displacements are found by solving the system of linear equations (2), symbolically:
Subsequently, the members' characteristic forces may be found from Eq.(1) where can be found from r by compatibility consideration.
Read more about this topic: Direct Stiffness Method
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