冷弯薄壁型钢构件的直接强度设计法

Direct Strength Method for the Design of Cold-Formed Lipped Channel Members

受压或受弯的冷弯薄壁卷边槽钢有板件局部屈曲,截面畸变屈曲和整体弯曲屈曲或弯扭屈曲三种模式。本文着重介绍板件的相关屈曲和计算截面畸变屈曲应力的方法并阐述了三种屈曲模式之间的相关关系。指出用传统的有效截面设计法计算受压和受弯冷弯薄壁卷边槽钢承载力的弊端,较详细地说明了用构件全截面计算的直接强度设计法。

For cold- formed lipped channels, under compression or bending, there are three buckling modes, plate local buckling, section distor-tional buckling and overall flexural or tensional - flexural buckling. This paper emphasizes the interaction of plate local buckling, the calculation of section distortional buckling stresses and the interaction of three buckling modes. It indicates that there is defect of the current effective area method for the design of cold - formed lipped channel members. The direct strength method using the complete cross - section of the members are illustrated through examples.