论文部分内容阅读
非弹性设计方法与弹性设计方法相比,其截面的允许荷载值较大,这是由于屈服应力沿截面高度进行了重新分布。塑性设计方法使得截面的塑性能力和塑性铰的转动特性得到充分发挥,从而使结构设计更为经济合理。冷弯槽钢在农业和轻工/商业中广泛用于门式刚架结构,塑性设计方法对这类结构非常适用,然而目前仅采用弹性设计方法对其进行设计。为突破设计规范的限制,对冷弯槽钢的非弹性弯曲能力进行了试验研究和数值分析,以建立相应的设计准则。设计准则采用热轧钢分类方法,将截面分为紧凑型、非紧凑型及细长型(根据澳大利亚规范),或1,2,3,4级(根据欧洲规范)。澳大利亚规范所预测的超过弹性极限范围的冷弯槽钢弯曲能力精确可靠。
Inelastic design method compared with the elastic design method, the section of the allowable load value is larger, which is due to the yield stress along the section height redistribution. The plastic design method gives full play to the plasticity of the cross section and the rotational characteristics of the plastic hinge, so that the structural design is more economical and reasonable. Cold-formed channel steel is widely used in portal frame structures in agriculture and light industry / commerce. The plastic design method is well suited for this type of structure, however, it is currently only designed with flexible design methods. In order to overcome the limitation of design specifications, the inelastic bending capacity of cold-formed channel steel was experimentally studied and analyzed numerically to establish corresponding design criteria. Design criteria The hot-rolled steel classification method is used to classify the sections into compact, non-compact and slender (according to Australian specifications), or Class 1, 2, 3 and 4 according to the European Code. The bending strength of cold-formed channel above the elastic limit predicted by Australian Code is accurate and reliable.