计算及推算结构失稳临界荷载的方法与实测验证

A Method of Calculating the Buckling loadof Structrue and Its Experimental Verification

分析了结构失稳时Ｐ＿δ试验曲线的图形性质；提出了以最大曲率计算及推算结构失稳临界荷载，并导出了相应的计算公式。运用压杆和刚架弹性稳定试验的实测数据，说明本文所述方法既精确又简便。特别是结构或模型不允许作破坏试验时，可直接推算失稳临界荷载。

In this paper the characteristics of the P-δ testing curves of the buckling structures are analysed.A method of deducing the buckling load of structure by means of the concept of maximum curvature ispresented and the correspondent calculating formula is established. The method is proved to be both ac-curate and simple by comparison of the theoretical values with the experimentally measured values ofthe elastic stability tests of struts and frames. Especially,the buckling loads can directly be calculatedwith the formula when the failure experiments of the structures and models are not admitted to bedone.