| Crane girder is one of the most important members in industry workshop. High operation frequency steel crane girder is susceptible to fatigue damage after long period of usage. It is most common that fatigue damage manifests as web cracks in the variable cross-section, and vertical cracks in the weld between web and top flange.This paper aims at the 24 m molten steel receiving span crane girder(A7classification group) as the main object, based on the detection results of molten steel receiving span and feed span from the main steel-making workshop in Shandong Steel Co., Ltd. ABAQUS as the large finite element software was employed to construct a finite element model of 24 m steel crane girder(A7 classification group) and the corresponding actuating system. Analysis was mainly performed on the stress characteristic contributing to the variable cross-section crack and the weld crack between girder web and the top flange.With the help of ABAQUS finite element analysis, the extraordinary anti-fatigue performance brought by the end plates on the right-angle support of steel crane girders is indisputable. In addition, it should be strengthened at end plates and insert plates to strengthen connections. With regard to the fatigue at the weld between web and top flange, there has been substantial impact of rail eccentricity on this position. As the eccentricity increases, considerable stress concentrates at this point, which cultivates in the fulcrum crack. The anti-fatigue performance of weld between the web and the top flange at the intermediate region of the neighboring transverse stiffeners is peculiarly subjected to the force of rail gnawing, which is the culprit for the stress concentration and intercostal crack at this region. |
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