焊接钢吊车梁上部区域疲劳破坏的探讨

Probe on the mechanism of the fatigue fracture of the upper part of welded steel crane girders

通过模型试验，研究了焊接钢吊车梁在偏心集中荷载作用下，上部区域的应力集中变化规律。

Through experiment on model,the regularities of the stress concentration of the upper part of welded steel crane girders which are subjected to eccentric and concentrated load are studied,then it is put forward that the local extra bent stress in the upper part of the web,which results from the eccentric and concentrated load,is the main reason that leads to the fatigue fracture of the upper part of the crane girders.