Review article

The method of determining the critical parameters of stability of the crane beam walls with fatigue cracks in the compressed belt zone is briefly described. The dependences of the bifurcation critical and limit stresses in the wall on the crack length, the crack position in the section, and on the wall flexibility are shown. The results of numerical studies of the effect of cracks on the increase in normal stresses in the compressed belt are presented. A method for assessing the local stability of the beam wall with a crack is proposed.