The connectivity of plastic flag is the judgment of the three criterions. Three different case were calculated using the general FEM software------ADINA.

• 本文利用ADINA有限元通用软件,对三个不同的算例进行强度折减计算,然后分别采用三种失稳判别标准进行稳定性分析,对三种失稳判别标准适用性、三者之间的一致性、各自的适用范围进行了分析研究。