起重机箱形主梁是起重机制造监检中的主要受力结构件,笔者在制造监检中常常发现箱形主梁内部构件横向加劲肋与下盖板间隙大小不一。这里横向加劲肋是指箱形主梁中大横向加劲肋,而小横向加劲肋本文在此不探讨。1设置横向加劲肋的必要性对于双梁桥式起重机和门式起重机,一般无须进行整机稳定性验算,但应进行腹板和盖板局部稳定性验算。在剪应力、弯曲应力、局部正应力及它们的共 Crane girder crane is the main force in the manufacture of structural inspection, the author often found in the manufacture of monitoring cross-stiffener internal box girder and the gap between the lower cover of different sizes. The transverse stiffeners here refer to the large transverse stiffeners in the box girder, while the small transverse stiffeners are not discussed here. 1 The necessity of setting transverse stiffeners For double girder overhead traveling cranes and gantry cranes, it is not necessary to check the stability of the whole machine, but the local stability check of webs and covers should be carried out. In the shear stress, bending stress, local normal stress and their total