The virtual work principle approach is more general as it is applicable to both linear and non linear material behaviours. The virtual work method is an expression of conservation of energy: for conservative systems, the work added to the system by a set of applied forces is equal to the energy stored in the system in the form of strain energy of the structure’s components.The principle of virtual displacements for the structural system expresses the mathematical identity of external and internal virtual work:In other words, the summation of the work done on the system by the set of external forces is equal to the work stored as strain energy in the elements that make up the system.The virtual internal work in the right hand side of the above equation may be found by summing the virtual work done on the individual elements. The latter requires that force displacement functions be used that describe the response for each individual element.
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