在应力梯度下边缘加劲板的试验和设计

薄钢板结构有3种典型类型:非加劲(无边缘加劲板),加劲(有充足边缘的加劲板)和部分加劲(有部分边缘加劲板)。当被用于冷弯薄壁型钢时,在承受均匀压力和应力梯度下,钢板可能发生弹性屈曲,有6种可能的荷载组合条件。除了应力梯度作用下的部分加劲构件,对所有类型的钢板都进行了试验研究并提出了设计公式。阐述了当部分加劲板的加劲单元尺寸从零到足够产生加劲作用时,在应力梯度作用下部分加劲板的试验情况。研究了单一加劲和复合加劲的边缘加劲类型。利用有效宽度概念,提出了部分加劲构件在应力梯度作用下的设计公式。在此基础上提出了适用于所有构件在任意荷载条件下的有效宽度公式。

Experiments and Design of Edge-Stiffened Plates Under Stress Gradient

The behaviour of thin steel plates fall into three general classes,unstiffened(no edge-stiffener),stiffened(adequate sized edge-stiffener) and partially stiffened(inadequate sized edge-stiffener).When used in cold-formed steel sections they may elastically buckle when subjected to either uniform compression or stress gradient.There are thus six possible combinations of element class and loading condition.All except the class of partially stiffened elements under stress gradient has been investigated experimentally,and design equations developed.This paper presents experiments of edge-stiffened plates under stress gradient,where the edge-stiffener size was increased from zero to a size sufficient to create a stiffened element.Edge-stiffener types investigated are simple lips and complex lips.Design solutions for partially stiffened elements under stress gradient using the effective width concept are presented.A generalised effective width design model is developed to account for all classes of elements under any loading condition.