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针对断面规格为□200×300×9.2的冷弯厚壁矩形型钢管,进行了平板、弯角、相应母材和短柱试件的力学性能试验。结合冷弯生产工艺,分析了平板、弯角试件力学性能随冷弯道次的变化规律,并与相关厚壁型钢冷作硬化效应作了比较。运用国内外冷弯型钢设计规范和相关文献中的修正公式,对该厚壁冷弯方形型钢全截面强度进行了设计和对比分析。结果表明:国内薄壁和国外厚壁公式都不可直接用于本冷弯厚壁矩形型钢强度设计,国外公式更偏于危险;魏氏体组织是造成带焊缝板件强度高而塑性差的主要原因;焊接热使板件受到低温“退火”而强度降低,从而导致两竖直侧平板件强度甚至低于母材。
For the cold-formed thick-walled rectangular steel pipe with the section size of 200 × 300 × 9.2, the mechanical properties of the flat plate, the bending angle, the corresponding base metal and the short column specimens were tested. Combined with the cold bending production process, the variation of mechanical properties of the flat and curved specimens with cold bending times was analyzed and compared with the cold hardening effect of the related thick-walled steel. Using the domestic and international cold-formed steel design code and the corrections in the literature, the full-section strength of the cold-formed square section thick-walled steel was designed and compared. The results show that neither domestic thin-wall nor foreign thick-walled formulas can be directly applied to the strength design of the cold-formed thick-walled section steel. The foreign formulas are more dangerous than others. The main reason; the welding heat to the plate by low temperature “annealing ” and the strength decreased, resulting in the strength of the two vertical side plate even lower than the base metal.