When both ends of column are pinned or hinged, buckling load equation is given by

1
\(\frac{{{\pi ^2}EI}}{{{l^2}}}\)
2
\(\frac{{{\pi ^3}EI}}{{{l^3}}}\)
3
\(\frac{{{\pi ^2}EI}}{{{l^3}}}\)
4
\(\frac{{{\pi ^2}EI}}{{{l^4}}}\)

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