冷弯凹槽加强薄板的屈曲性能分析及应用

Buckling analysis and application of thin-walled steel plate with cold bending grooves

为防止薄壁钢板在面内压应力作用下发生屈曲,目前常见的加强方式为增加板厚和焊接加劲肋.然而,前者的经济性较差,后者工艺复杂、较易产生缺陷.针对单向受压薄板,提出一种新的稳定性加强方式,即在适当的位置对板件进行冷弯处理形成凹槽.利用ANSYS软件对未加强薄板、矩形截面焊接加劲板和冷弯凹槽加强板进行模态仿真分析,得到各种情况不同参数设置下的屈曲临界载荷.结果表明:加工冷弯凹槽的方式能够有效地增强薄板的稳定性,并且在对板边具有相同惯性矩和相对于薄板具有相同截面积增加量的条件下,其效果比焊接加劲好.

Thin-walled steel plate tends to buckle if the in-plane compressive force is heavier than a certain value,which is called critical buckling load.In order to avoid this failure,two methods are widely adopted,which are increasing the thickness and welding ribbed stiffeners.However,the former is less economical while the latter will lead to welding defects.In this paper,a new method is provided,which is forming one or several grooves in appropriate place by means of cold bending.The critical buckling loads of three kinds of plate with the same dimensions are analyzed by ANSYS software,which are a plate without strengthen structure,a plate with a welding rectangular stiffener and a plate with a cold bending groove.Results show that cold bending grooves are able to strengthen the plate,which are even more effective than welding stiffener when they have the same moment of inertia or the same area.