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为研究冷弯效应对壁厚6.0 mm以上的冷弯厚壁型钢屈服强度的影响,对4种不同截面、不同厚度的冷弯厚壁型钢进行了截面不同部位的材性试验研究,同时对现有国内冷弯厚壁型钢的材性试验和短柱试验数据进行了汇总。在简要回顾国内外冷弯厚壁型钢考虑冷弯效应的屈服强度计算公式及其理论依据的基础上,将各国规范计算值与试验值进行了对比。结果表明:冷弯效应对冷弯厚壁型钢的屈服强度影响较大,其影响程度与板件的宽厚比关系明显;我国规范、北美、澳洲/新西兰规范公式,以及朱爱珠基于我国规范提出的修正公式计算结果偏于保守,而欧洲规范的计算结果略偏大;我国GB 50018—2002《冷弯薄壁型钢结构技术规范》中计算方法理论依据充分,且在计算结果偏于安全的同时变异系数较小,更适合于工程应用。
In order to study the effect of cold bending on the yield strength of cold-formed thick-walled section steel with a wall thickness of 6.0 mm or more, the material properties of four sections of cold-formed thick-walled section steel with different thicknesses and thicknesses were studied. Domestic cold-formed thick wall steel material test and short column test data were summarized. On the basis of a brief review of the yield strength formula of cold-formed thick-wall steel considering cold-formed effect and its theoretical basis, the calculated value and test value of each country are compared. The results show that the cold bending effect has a great influence on the yield strength of the cold-formed thick-walled section steel, and the influence degree of the cold-formed heavy wall steel has a significant relationship with the aspect ratio of the plate. The standardization formula of China, North America, Australia / New Zealand and Zhu Aizhu’s amendment The results of the formulas are conservative but the results of the European norms are slightly larger. The calculation method of GB 50018-2002 Technical Specification for Cold-formed Thin-walled Steel Structures is based on sufficient theory and the simultaneous coefficient of variation Smaller, more suitable for engineering applications.