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in the specific context of bridge construction from the Federal Highway Administration. from the manual, such as column buckling frame analysis Structural Stability Chen Solution Manual - SIHM
$kL = \sqrt\fracP_cr L^2EI = 4.493$. $P_cr = \frac(4.493)^2 EIL^2 \approx \frac20.19 EIL^2$.
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