For a structure in equilibrium, the principle of virtual work states that the virtual work of the external forces is equal to the
Correct answer: A. Virtual work of the internal forces
- A. Virtual work of the internal forces
- B. Total strain energy of the structure
- C. Kinetic energy of the moving loads
- D. Permanent deformation of the members
Explanation
Equilibrium requires the external virtual work to equal the internal virtual work for every compatible virtual displacement. Strain energy and kinetic energy are different quantities and do not replace internal virtual work in this principle.
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About Structural Analysis
Structural analysis determines how beams, frames, trusses and arches carry loads through reactions, shear forces, bending moments, axial forces and deflections. It covers free-body diagrams, equilibrium equations, determinacy, influence lines and methods such as slope deflection, moment distribution and virtual work, while distinguishing analysis of a structure from its design.
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