Civil Engineering MCQAE Level Civil Engineering
The principle of virtual work for a structure states that at equilibrium, the external virtual work done by real forces through virtual displacements equals:
Structural AnalysisExternal Virtual WorkMEDIUM
Choose the correct answer
A
Zero
B
Internal virtual work (Σ M δκ dx or Σ F δu)
C
Total strain energy
D
Total potential energy
Correct Answer
B. Internal virtual work (Σ M δκ dx or Σ F δu)
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Virtual work principle: Σ(P_i × δ_i) = internal virtual work (∫Mδ(1/R)dx for beams, or Σ F_i δu_i for trusses). This holds for any equilibrium configuration.
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