![]() Solving these equations, redundant forces are calculated. Part 3 covers the Stiffness matrix (displacement) method with member approach (direct Stiffness method) which is extensively used in the analysis of framed structures. After determining the unknown displacements, the other forces are calculated satisfying the compatibility conditions and force-displacement relations. In the force method of analysis: The primary unknown forces in the members and compatibility equations are written for displacement and rotations (which are calculated by force-displacement equations) in this method. By taking simple examples, the steps involved in both the methods are discussed and it is concluded why stiffness matrix method is more suitable for analysis of skeletal structures. Primary unknowns are the displacements and initially, force-displacement relations are computed and subsequently, equations are written satisfying the equilibrium conditions of the structure in this method. Once the redundant forces are calculated, the remaining reactions are evaluated by equations of equilibrium. ![]() The primary unknown forces in the members and compatibility equations are written for displacement and rotations (which are calculated by force-displacement equations) in this method. ![]()
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