In the force method, the basic system involves the removal of redundant forces, while the stiffness method involves restraining the joints of the structure against displacement. In the force methods, the behaviour of the structure is considered in terms of unknown forces, while in the stiffness method, the behaviour of the structure is considered in terms of unknown displacements.īy implication, both analysis methods always involve reducing the structure to a basic system (a determinate system). Displacement methods (also known as stiffness or equilibrium method)Įach method involves the combination of a particular solution which is obtained by making the structure statically determinate and a complementary solution in which the effect of each individual modification is assessed. ![]() Stiffness method (matrix form for computer implementation): global and local reference systems beam and truss. Example 3 ElExample 2: Determine the internal moments in the beam at the supports Support A downward movement of 0.3cm & clockwise rotation of 0.001 rad. ![]() Flexibility methods (also known as force methods, compatibility methods, or the method of consistent deformations), and Stiffness method versus Flexibility method. Displacement Method of Analysis Degree of Freedom The number of possible joint rotations & independent joint. ![]() It is a well-known fact that there are two basic methods of analysing statically indeterminate structures which are
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