赵根田  左勇志  李  斌
    （包头钢铁学院 014010）

[提要]  通过3根模型梁试验，研究了带裂缝焊接钢吊车梁在偏心集中荷载作用下，上部区域的应力分布及应力变化规律，提出了偏心集中荷载在腹板上部产生的局部附加应力是导致吊车梁上部区域裂缝形成与开展的主要原因。
[关键词]  钢吊车梁 裂缝 偏心荷载

Through experiments on 3 models, the regularities of the stress distribution and the change in the upper part of welded steel crane girders with cracks are studied under the eccentric and concentrated load, then it is put forward that the local extra stress in the upper part of the web, which is resulted from the eccentric and concentrated load,is the main reason that leads to the cracks appearance and growth in the upper part of the crane girders.
Keywords: steel  crane girder; crack; eccentricity load