Abstract
Formulas are derived for computing the plastic buckling stress of long simply supported plates that are subject to a combination of shear and longitudinal bending in their plane. The energy method and oblique coordinates are used. The integration in the plastic regions is carried out partially by using Simpson's rule. The more general case of combined shear and eccentric compression is also considered. After evaluating these computations for some definite cases, simple design formulas are presented for computing the plastic reduction factor, with which the elastic buckling stress for the so-called associated elastic case has to be multiplied in order to obtain the plastic buckling stress. An approximate formula is presented for calculating the elastic buckling stress for combined shear and eccentric compression.
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