If the effective length of a column is twice the actual length, then the column is ________.

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Question

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NPCIL SA/ST ME GJ Held on 08/11/2019, Shift-1

Answer 1

Concept:

Effective length is defined as the distance between two adjacent points of zero bending moment or contra flexure.

The value of the effective length varies according to the support condition.

End condition	Both ends hinged	One end fixed other free	Both ends fixed	One end fixed and other hinged
Effective length	L	2L	L/2	L/√2

According to Euler's column theory, the crippling load for a column of length L,

\({P_{cr}}= \;\frac{{{\pi ^2}EI}}{{{{\left( {L_e} \right)}^2}}}\)

Where Leq is the effective length of the column.