$3$: The rectangular column is subjected to the eccentric load $F$ at point $)=8mm,b=(15mm.$ Determine the buckling load $F_{cr}.$ Use steel $,$ allowable bending stress $($:${}_b=220$MPa$\}.$ Assume: Effective length $L_e=0\mathrm{.}8m,h=0\mathrm{.}032m,w=0\mathrm{.}06m$;$A=0\mathrm{.}00192m^2,Ix=5\mathrm{.}76{10}^{-7}{m}^4,Iy=1\mathrm{.}6384{10}^{-7}{m}^4$ Solution:

$a=8mm,b=15mm$

$1e=0\mathrm{.}8m$

$h=0\mathrm{.}032m$

$w=0\mathrm{.}06m$

$4=0\mathrm{.}00142m^2$

$x=5\mathrm{.}76{10}^{-7}$

$x=1\mathrm{.}6384{10}^{-7}$

$b=220$mPa

$y=20$MPa

$y=240$MPa

$=200$GPa$=200{10}^{a}Pa$