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Civil Engineering QUESTION #6618
Question 1
A 'P-Delta' (P-$\Delta$) effect in structural analysis refers to:
  • The increase in internal forces due to the displacement of the structure's nodes✔️
  • The difference between Plastic and Elastic modulus
  • The effect of Poisson's ratio on steel density
  • The pressure-volume relationship in welding
Correct Answer Explanation
P-Delta is a second-order effect where the axial load $P$ acting on the displaced geometry (deflection $\Delta$) creates additional moments ($P \times \Delta$) that are not captured in a first-order linear analysis.