摘要
目前,我国对壁厚6 mm以上的冷弯型钢在结构设计时尚无相应技术标准可依。首先,介绍了北美AISI、澳洲/新西兰AS/NZS规范、欧洲ER3规范和我国GB 50018—2002规范中考虑冷弯效应的屈服强度计算方法及其理论依据,并将各规范计算值与冷弯厚壁试验数据进行了对比,结果表明各国规范计算值均偏于保守,其中,我国规范计算值和欧洲规范很接近,可用于厚壁型钢考虑冷弯效应的屈服强度计算。其次,鉴于冷弯型钢中残余应力分布与热轧型钢中完全不同,对冷弯残余应力从试验、理论和数值研究方面进行了评述,可为冷弯厚壁型钢构件的进一步研究提供基础。最后,结合我国现有的规范情况,对冷弯厚壁型钢在冷弯效应及残余应力方面有待进一步研究的问题提出了建议。
At present, there is no corresponding technical standard for plate thickness above 6mm of cold- formed steel in China. The calculation methods of strain hardening of cold-formed steel using AISI, AS/NZS, ER3 and Chinese GB 50018--2002 specifications and their theoretical basis were presented firstly, and then the calculated values from these standards were compared with test data of thick cold-formed steel. It was shown that these specifications are all relatively conservative, and the results from Chinese and European standards agree very well. As a resuh,the Chinese GB 50018--2002 specification can be used for calculating the effect of cold forming in thick-walled steel. Besides, due to the distribution of residual stresses in cold- formed steel are quite differently from hot-rolled steel, the cold-formed residual stresses were reviewed from experimental,theoretical and numerical aspect, which provides a basis for further study of cold-formed thick- walled steel members. Finally, the future research trend on effect of cold forming and residual stresses in cold- formed thick-walled steel was discussed combined with our national code.
出处
《结构工程师》
2010年第1期156-163,共8页
Structural Engineers
基金
国家科技支撑计划课题(2006BAJ04A02-04)
关键词
冷弯型钢
冷弯效应
残余应力
屈服强度
厚壁
cold-formed steel, effect of cold forming, residual stresses, yield strength, thick-walled
