Влияние геометрических несовершенств сжатого пояса на несущую способность подкрановых балок с усталостными трещинами в стенке

Abstract

In order to evaluate the effect of geometric imperfections of the compressed belt on the bearing capacity of crane beams with fatigue cracks in the wall, the authors present the results of numerical studies that were carried out using finite element modeling. There has been developed and implemented an algorithm for taking into account the imperfections of the compressed belt using the finite element method. There have been obtained dependences of the change in the average normal stresses in the compressed belt on the type of imperfection, the length of the crack, its position in the beam section and the flexibility of the wall. Recommendations are offered for assessing the reduction in the bearing capacity of crane beams with fatigue cracks in the wall.