压弯构件整体稳定性计算中增大系数的修正

Correction of increasing coefficient in calculation of overall stability of compression-flexure member

指出两个国内起重机设计规范中增大系数的差异,说明了增大系数的由来。通过对国内外标准规范中增大系数的比较,首次提出将增大系数中的欧拉临界力视为规定强度,用安全系数和抗力系数进行修正的方法。该方法不用人为地设计修正系数,不用制定特别的修正规则,简单易行,具有合理的安全性和一致性。

This paper points out the difference of the increase coefficient between the two domestic crane design codes and explains the reason for using the increase coefficient.By comparing the increase coefficient in the domestic and foreign standards and codes,this paper proposes for the first time that Euler’s critical force in the increase coefficient is regarded as the specified strength and the safety coefficient and resistance coefficient are used for correction.The use of this method requires no artificial design of correction coefficients and no special correction rules.It is simple and feasible,and the method is reasonable in safety and consistent.