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本文针对单层单跨和单层双跨两种钢框架结构在加工和安装过程中可能出现的偏差,进行了基于线弹性理论的稳定特征系数的分析和基于非线性极限承载能力分析的极限荷载分析。重点讨论了在考虑各种偏差及偏差组合后,单层单跨及单层双跨钢框架结构稳定性的下降特点。计算表明,仅考虑单一偏差,对于框架的稳定性影响不大,但在考虑各种偏差组合后结构的稳定承载力下降较大。初始偏差对于线性稳定特征值影响比非线性分析的影响略大。随着框架的跨数增加,初始偏差的影响变得复杂。
In this paper, according to the possible discrepancies in the processing and installation of single-span single-span and single-span two-span steel frame structures, the stability characteristic coefficients based on the linear elastic theory and the ultimate load based on the nonlinear ultimate load carrying capacity analysis. After discussing the combinations of deviations and deviations, the stability of single-span single-span and single-span double-span steel frame structure is discussed. The calculation shows that considering only a single deviation has little effect on the stability of the frame, but the stability of the structure decreases greatly after considering various combinations of deviations. The influence of initial deviations on linear stability eigenvalues is slightly greater than that of nonlinear ones. As the number of frames increases, the effect of initial bias becomes complicated.