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. Lets consider an example of a beam structure. 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). Force approach uses compatability equation whereas for displacement based, we use equilibrium equations. In addition, the structural performance of specimens under the joint actions with strain rate and size are also studied. The meso damage of recycled concrete is analyzed. The specimens are loaded with different strain rates. forces in a roof or bridge truss, than did the displacement method. A 2D meso models of recycled concrete with different sizes is established using the base force element method. 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. (4) Examples indicate that certain problems can be solved.
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