The influence of shearing deformation causes the non-uniform stress in the wing plate of the box girder, especially the cantilever box girder.

剪切变形的影响使得箱形梁的翼板中出现应力不均匀现象，尤其是悬臂箱形梁剪力滞现象。

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Cracks occurred in the main weld joining the web and upper wing panel of an overhead crane girder of I-section, some of which have expanded to the structure material and even led to girder fracture.

桥式起重机采用工字形截面作为主梁，使用多年后该结构形式的主梁上翼缘板和腹板连接的主焊缝及母材多处产生裂纹，甚至发生主梁断裂事故。

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