The buckling differential equation of the slender pressure bar under axial compression was estab-lished by the simplified elastic mechanics method,and the deflection curve equation and the buckling load for-mula were derived.The research results show that under the axial pressure,if the axial pressure is less than or equal to the buckling load,the bar would always maintain a straight line.While considering the axial deforma-tion,the middle deflection can be determined by using the linear buckling differential equation.The effect of shear deformation on buckling load can be ignored when there are no holes on the surface of the slender pressure bar and it is integral and continuous.The shear deformation has a great influence on the buckling load of the lat-tice slender pressure bar,so the influence of shear deformation on the buckling load cannot be ignored.
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