What is the expression for crippling load for a column of length L, with one end fixed and other end free?
- A. $P = \pi² EI / 4L^2$
- B. $P = \pi² EI / L²$
- C. $P = 2\pi² EI / L$
- D. $4\pi² EI / L²$
Answer: A. $P = \pi² EI / 4L^2$
Explanation: Effective length $Le = 2L$. $P = \pi² EI / (2L)^2$.