For a two-dimensional rigid-jointed frame, which statement best describes the stiffness method?
Correct answer: B. It treats nodal displacements as primary unknowns
- A. It uses equilibrium only and ignores compatibility
- B. It treats nodal displacements as primary unknowns
- C. It determines member forces without nodal displacements
- D. It applies only to statically determinate structures
Explanation
The stiffness method formulates relationships between nodal displacements and nodal forces, then solves for the unknown joint translations and rotations. Member end forces are calculated afterward from these displacements and the member stiffness properties.
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