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冷弯薄壁钢柱的生产工艺决定其钢柱的冷加工性,并且显著影响钢柱性能。传统上,基于在有限试验条件下实现同时制造不同的平面部分和角部,采用理想化残余应力分布评估生产工艺对钢柱性能的影响,由经验得到的方法,往往不能准确反映钢柱的冷加工性。因此,提出一种先进的数值方法,用于分析足尺折弯机式冷弯薄壁钢柱的结构性能,该方法可准确反映钢柱冷工作效应。利用分析冷弯形成过程的封闭解得到的残余应力和等效塑性应变,确定钢柱的冷工作性能,且分析结果可用有限元模型中的非线性屈曲分析直接求解。利用改进的柱数值模型的分析结果,碳素钢和不锈钢截面均影响着柱的冷工作性能。数值分析结果同样可解释残余应力和柱的冷弯型钢的性能发生较大变化的原因。该数值方法很可能将代替试验,从而可节省试验经费。
Cold-formed thin-walled steel column production process determines the cold workability of steel columns, and significantly affect the steel column performance. Traditionally, based on the fact that different planar parts and corners are manufactured simultaneously under limited experimental conditions, the idealized residual stress distribution can be used to evaluate the influence of the production process on the properties of steel columns. Experienced methods often do not accurately reflect the cold working of steel columns Sex. Therefore, an advanced numerical method is proposed to analyze the structural performance of cold-formed thin-walled steel columns with full-scale bending. This method can accurately reflect the cold working effect of steel columns. The cold working performance of the steel column is determined by analyzing the residual stress and equivalent plastic strain obtained by the closed solution of the cold forming process. The analysis results can be directly solved by the nonlinear buckling analysis in the finite element model. Based on the analysis results of the improved column numerical model, both the carbon steel and stainless steel sections affect the cold working performance of the column. The numerical analysis also explains why there is a large variation in the residual stress and column performance of cold-formed sections. The numerical method is likely to replace the test, which can save the test funding.