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将传统有限条法应用于采用直接强度法的冷弯型钢杆设计中,针对存在的两个问题,提出解决办法和设计建议。有线条法无法确定局部和畸变屈曲模态,要确定设计强度就要输入弹性屈曲荷载。而约束有线条法虽能确定局部和畸变屈曲模态,但也存在局限性。它达不到有线条法求解的精度,特别是当有线条法求解存在最小值时;且要求横截面不能存在圆角。提出这两种方法来消除这些局限性,它们都是约束有限条法的增强形式。通过直接强度法求解卷边槽钢截面弹性屈曲荷载和极限承载力。约束有限条法不允许存在截面圆角,求解屈曲荷载和极限承载力时特别注意处理圆角。基于对卷边槽钢杆件的研究,提出建议,使能采用直接强度法分析冷弯型钢杆的弹性屈曲。
The traditional finite strip method is applied to the design of cold-formed steel bars by direct strength method, and the solutions and design suggestions are put forward according to the two existing problems. Wiring method can not determine the local and distorted buckling modalities, to determine the design strength is to enter the elastic buckling load. Constraints of the line method can determine the local and distorted buckling modes, but there are also limitations. It does not reach the accuracy of the line method, especially when there is a minimum for a line method; and it is required that the cross section be free of fillets. Both of these approaches are proposed to eliminate these limitations, all of which are enhanced forms of constrained finite law. Calculation of elastic buckling load and ultimate bearing capacity of curling channel section by direct strength method. Constrained finite strip method does not allow the existence of fillet, buckling load and ultimate bearing capacity to pay special attention to deal with fillets. Based on the research of curling channel steel bars, some suggestions are put forward to make it possible to analyze the elastic buckling of cold-formed steel bars by using direct strength method.