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本文综合指定杆长求极限承载力和确定轴向压力求构件极限承载长度这两种计算方法的优点,采用逆算单元长度法计算构件长度,通过轴力增量和端转角增量的交互控制,考虑初弯曲的影响,从而提出了一种在不等端弯矩作用下,计算速度和精度均较满意的压弯构件面内失稳极限承载力计算方法,并用之于计算双角钢截面压弯构件的极限承载力.根据所得的N/N_P-M/M_P相关曲线,验证了钢结构规范中有关规定,提出了相应的面内失稳验算式,供修订钢结构规范参考.
In this paper, the advantages of the two methods of calculating the ultimate bearing capacity of the specified rod and determining the ultimate bearing length of the axial pressure are determined. The length of the component is calculated by the length of the inverse calculation unit, and the interactive control of the increment of the axial force and the increase of the end rotation angle is adopted. Considering the influence of the initial bending, a method for calculating the ultimate bearing capacity of the in-plane destabilization of the bending-bending component under the action of an unequal bending moment and with satisfactory calculation speed and accuracy is proposed and used to calculate the bending angle of the double-angle steel section. The ultimate bearing capacity of the component. Based on the obtained N/N_P-M/M_P correlation curve, the relevant provisions of the steel structure specification are verified, and the corresponding in-plane instability checking formula is proposed for the reference of the revised steel structure specification.